Merge changes from prometheus/mebox-40a7378b

优化
2026-11-13 03:44:23 +08:00 · 2026-11-12 22:38:54 +08:00 · 2026-11-12 22:13:57 +08:00 · 2026-11-12 18:58:45 +08:00 · 2026-11-05 17:03:26 +08:00 · 2026-11-04 10:16:12 +08:00
227 changed files with 19591 additions and 977 deletions
@@ -79,6 +79,9 @@ func (a *application) start() error {
 		}
 	}

+	if err := database.ApplyPendingSQLiteRestore(context.Background(), a.cfg, a.logger); err != nil {
+		return fmt.Errorf("apply pending database restore: %w", err)
+	}
 	db, err := database.Open(a.cfg, a.logger)
 	if err != nil {
 		a.logger.Error("database open failed", zap.Error(err))
@@ -110,6 +113,14 @@ func (a *application) start() error {
 		a.logger.Info("polluted episode metadata cleanup completed", zap.Int("media_count", cleaned))
 	}

+	// 一次性删除旧版解析误写的「整集片头/回顾」区间（end_ms <= start_ms），
+	// 否则升级后播放器仍会一开播就弹跳过按钮。
+	if cleaned, err := a.services.NormalizeImpossibleSegments(context.Background()); err != nil {
+		a.logger.Warn("impossible skip segment cleanup failed", zap.Error(err))
+	} else if cleaned > 0 {
+		a.logger.Info("impossible skip segments removed", zap.Int("rows", cleaned))
+	}
+
 	if err := a.services.Auth.SeedAdmin(context.Background()); err != nil {
 		a.logger.Warn("seed admin failed", zap.Error(err))
 	}
@@ -0,0 +1,636 @@
+# 115 云下载 → STRM 同步 → 自动刮削 · 实施方案
+
+| 项 | 内容 |
+| :--- | :--- |
+| 状态 | 设计已定稿，待实现（P0 未开工） |
+| 适用版本 | MeBox 当前主线（`internal/service/strm_*`、`internal/service/cloud115/*`） |
+| 关联文档 | `115doc/115开放平台/API列表/云下载/*`（仓库内离线文档） |
+| 最后核对 | 本文所有代码事实均按仓库当前代码逐条核对，行号仅供定位参考 |
+
+---
+
+## 1. 目标与范围
+
+### 1.1 目标
+
+在「115 媒体库映射」（即 STRM 管理中的一条 `StrmSyncPath`：115 目录 → 本地目录 .strm）之上提供云下载入口，用户提交磁力 / BT 种子 / ed2k / HTTP 链接后：
+
+1. 任务提交到 115 离线（云下载）；
+2. 后台轮询 115 任务状态；
+3. 任务完成后**自动触发**该同步目录的 STRM 增量同步；
+4. 同步完成后**自动扫描**对应媒体库，生成 Media 行；
+5. **自动刮削**新增媒体，无需用户再点一次。
+
+全程无需离开 MeBox，链路上的每个阶段在任务列表里可见。
+
+### 1.2 明确不做（本期范围外）
+
+| 项 | 决定 | 原因 |
+| :--- | :--- | :--- |
+| 磁力链接选择部分文件下载 | **不做** | 开放平台 `/open/offline/add_task_urls` 无文件选择参数，且 `/open/offline/torrent` 只接受已上传种子的 `torrent_sha1` + `pick_code`，无法解析 magnet。见第 6 节 |
+| `.torrent` 勾选文件 UI | **不做** | 用户已确认本期不做选文件；种子按全选提交 |
+| 磁力转种子（DHT 抓 metadata） | **不做** | 需引入 torrent 依赖与常驻 DHT 网络行为，本期不引入新依赖 |
+| 非 115 网盘的离线下载 | **不做** | CD2 / OpenList / 本地目录无对应能力 |
+| 普通用户自助使用 | **不做** | 首期仅管理员（沿用 `AdminRequired` + `can_manage_strm` 语义），权限位见 9.3 |
+| 下载完成后自动整理/重命名（Organize） | **不做** | 与 STRM 映射模型冲突，`.strm` 必须与远端路径一一对应 |
+
+### 1.3 非目标（但需保证不被破坏）
+
+- 现有 STRM 手动同步 / Cron 同步 / 下载队列 / 上传队列行为不变；
+- 115 令牌自动刷新机制不得被第二个客户端实例破坏（见 3.3 关键约束 K1）；
+- 刮削不重复刷已 `matched` 的媒体（沿用 `EnqueueLibrary` 的候选过滤）。
+
+---
+
+## 2. 现状核实
+
+### 2.1 已具备
+
+| 能力 | 位置 | 说明 |
+| :--- | :--- | :--- |
+| 115 OpenAPI 客户端 | `internal/service/cloud115/client.go`、`const.go:16` | `OpenClient`，`ProAPIBase = https://proapi.115.com`，`doJSON` 内建重试与令牌刷新 |
+| 115 授权（PKCE/扫码）与令牌落库 | `cloud115/oauth.go`、`service/strm_115_oauth.go` | `OnTokenRefreshed` → `persist115Tokens` 写回 `StrmAccount.Config` |
+| 115 文件上传 / 秒传 | `cloud115/upload.go:217` | `Upload(ctx, filePath, parentCID, signKey, signVal)` → `UploadCompleteResult{FileId, PickCode, Sha1}` |
+| 115 目录创建 / 查找 | `cloud115/upload.go:318`（`MkDir`）、`cloud115/open.go:126`（`FindNamedContentInParent`） | 可用于建「云下载/种子文件」暂存目录 |
+| 115 全局限流/熔断 | `cloud115/throttle_manager.go` | `GetGlobalThrottleManager()` |
+| STRM 同步（增量/全量） | `service/strm_sync.go:82` `StartSync` | 已运行时返回「该目录正在同步中」，不排队 |
+| STRM 目录/记录/队列数据层 | `model/strm.go`、`repository/strm_repository.go` | — |
+| 扫描 + 自动刮削入口 | `service/scanner_scan.go`、`scanner_post_scan.go:19` | `startAutoScrape` 受 `scrape.auto_on_scan` 全局开关约束 |
+| 刮削入队 | `service/scraper_queue.go:219` `EnqueueLibrary` | 仅挑 `scrape_status` 为空的 `pending` 行，天然幂等、不会重刷已匹配 |
+| 周期任务框架 | `service/scheduler.go:118` `scheduledJob` | 新增 job 只需在 `Start` 里 append |
+| 服务装配 | `service/service_builder.go:148` | `NewStrmService` 之后才有 `Cloud115`，可作为依赖注入范式 |
+
+### 2.2 缺口（本方案要补的）
+
+| 缺口 | 影响 |
+| :--- | :--- |
+| 全仓无任何离线/云下载代码（`grep -r "offline" internal/service/cloud115/` 无命中） | 需从零封装 4 个 API |
+| `finishSync` 结束后**没有任何回调**（`strm_sync.go:323`） | 「同步完成 → 扫描」链路是断的，必须新增 hook |
+| 无「本地路径 → 媒体库」反查 | 需新增 repository 查询 |
+| 无 `.torrent` multipart 上传端点（现有仅 reader 书源、DB 恢复用到 `FormFile`） | 需新增端点 + 上传大小限制 |
+| 无云下载任务表 | 需新增模型 + 仓储 + 迁移注册 |
+
+---
+
+## 3. 总体设计
+
+### 3.1 链路时序
+
+```
+[前端] 提交（多行链接 / .torrent 文件）+ 选择目标 STRM 同步目录
+   │
+   ▼
+[CloudDownloadService.Submit]
+   │ 1) 校验账号可用、同步目录启用
+   │ 2) 配额预检 GET /open/offline/get_quota_info
+   │ 3) .torrent: 上传到「云下载/种子文件」→ POST /open/offline/torrent 拿 info_hash
+   │ 4) POST /open/offline/add_task_urls（批量 ≤115/批）或 /open/offline/add_task_bt
+   ▼
+[DB] CloudDownloadTask: status=submitted（逐条记录每个链接的受理结果）
+   │
+   ▼
+[Scheduler: cloud_download_poll 每 60s]
+   │ GET /open/offline/get_task_list?page=N 逐页
+   │ 按 info_hash（优先）/ url（回退）匹配本地任务
+   │ status 0/1 → downloading(percentDone)  |  2 → succeeded  |  -1 → failed
+   ▼
+[Pipeline: succeeded 任务]
+   │ A. 收集受影响 syncPathID（30s 去抖合并）
+   │ B. StrmService.StartSync(syncPathID, incremental)
+   ▼
+[StrmService.finishSync] → SetSyncFinishHook(ok)
+   │ C. 反查 LocalPath 对应的媒体库 → Scanner.ScanLibrary(libraryID)
+   │ D. Scraper.EnqueueLibrary(libraryID, 默认 options)（仅 pending 行）
+   ▼
+[DB] 回写 Stage=done；前端列表展示各阶段结果
+```
+
+### 3.2 模块职责
+
+| 模块 | 职责 | 明确不负责 |
+| :--- | :--- | :--- |
+| `cloud115/offline.go` | 纯 API 封装：参数拼装、响应解析、错误码映射 | 不碰数据库、不做编排 |
+| `CloudDownloadService` | 输入解析、校验、提交、状态机、轮询、编排 | 不直接读写 .strm 文件 |
+| `StrmService` | 现有同步逻辑 + 新增完成回调 | 不感知云下载概念 |
+| `ScannerService` / `ScraperService` | 现有扫描/刮削逻辑 | 不感知云下载概念 |
+
+### 3.3 关键约束（实现时必须遵守）
+
+**K1 — 必须复用 StrmService 已缓存的 115 客户端，禁止自行 `NewOpenClient`。**
+`strm_service.go:524` 的 `newProvider` 里给 `OpenClient` 挂了 `OnTokenRefreshed` → `persist115Tokens`。115 的 `refresh_token` 是一次性轮转的：若云下载服务另建一个客户端，两边各自刷新会互相作废，最终把账号刷成「授权已失效」。
+
+落地方式：给 `StrmService` 增加导出方法
+
+```go
+// Open115Client 返回账号已缓存的 115 客户端（含令牌自动刷新与落库）。
+func (s *StrmService) Open115Client(ctx context.Context, accountID string) (*cloud115.OpenClient, error)
+```
+
+内部复用 `providerFor` + `cloud.OpenAPI115Provider` 断言（与 `strm_sync.go:379` 的用法一致）。
+
+**K2 — 去抖。** `walk115Flat`（`strm_sync.go:682`）是整树自适应拉取，不是只看新目录。多个任务在短时间内完成时，同一 syncPath 只应同步一次。
+
+**K3 — 阶段失败隔离。** STRM 同步失败不得把 115 下载状态改成失败；反之亦然。下载状态与后处理阶段分别落在不同字段（见 4.1）。
+
+**K4 — 同步不排队。** `StartSync` 在运行中直接报错，Pipeline 必须自己实现「等待 + 重投」，不能靠重试打满日志。
+
+**K5 — 所有 115 调用走全局 throttle。** 轮询在无活跃任务时不得发起请求。
+
+---
+
+## 4. 数据模型
+
+### 4.1 `model.CloudDownloadTask`（新表 `cloud_download_tasks`）
+
+```go
+// internal/model/cloud_download.go
+type CloudDownloadTask struct {
+    Base
+    AccountID  string `gorm:"size:36;index" json:"account_id"`
+    SyncPathID string `gorm:"size:36;index" json:"sync_path_id"` // 绑定的 STRM 同步目录
+    LibraryID  string `gorm:"size:36;index" json:"library_id"`   // 由 LocalPath 反查得到，可为空
+    Provider   string `gorm:"size:32" json:"provider"`           // 固定 cloud115
+
+    SourceType string `gorm:"size:16;index" json:"source_type"` // magnet / torrent / ed2k / http / ftp
+    SourceURL  string `gorm:"type:text" json:"source_url"`      // 原始链接（.torrent 时存文件名）
+    SourceKey  string `gorm:"size:512;index" json:"source_key"` // 归一化后的匹配键：大写 info_hash 或 trim 后的 url
+    InfoHash   string `gorm:"size:64;index" json:"info_hash"`
+    TorrentName string `gorm:"size:512" json:"torrent_name,omitempty"`
+    TorrentSha1 string `gorm:"size:64" json:"torrent_sha1,omitempty"` // .torrent 路径用
+    PickCode    string `gorm:"size:128" json:"pick_code,omitempty"`   // .torrent 路径用
+
+    WpPathID string `gorm:"size:64" json:"wp_path_id"`        // 115 目标目录 ID（= syncPath.RemotePath）
+    SavePath string `gorm:"size:512" json:"save_path,omitempty"` // 相对 wp_path_id 的子路径（本期留空）
+
+    Status       string `gorm:"size:16;index" json:"status"` // queued/submitted/downloading/succeeded/failed/canceled
+    Percent      int    `json:"percent"`
+    SizeBytes    int64  `json:"size_bytes"`
+    Error        string `gorm:"size:1024" json:"error"`
+
+    Stage         string `gorm:"size:16;index" json:"stage"` // pending/waiting_sync/syncing/scanning/scraping/done/na
+    StageError    string `gorm:"size:1024" json:"stage_error"`
+    StrmRecordID  string `gorm:"size:36" json:"strm_record_id,omitempty"`
+    ScanAdded     int    `json:"scan_added"`
+    ScrapeQueued  int    `json:"scrape_queued"`
+
+    RetryCount int        `json:"retry_count"`
+    LastPollAt *time.Time `json:"last_poll_at,omitempty"`
+    NextPollAt *time.Time `gorm:"index" json:"next_poll_at,omitempty"`
+    CompletedAt *time.Time `json:"completed_at,omitempty"`
+}
+```
+
+注册点：`model.AllModels()`（`internal/model/model.go:37`）、`repository.Container`（`internal/repository/repository.go:11`）、`service.Container`（`internal/service/service.go:19`）。
+
+> **不复用 `StrmDownloadTask`**：那是「远端元数据 → 本地」的文件搬运队列（`model/strm.go`），语义完全不同，混用会让 `/admin/strm/downloads` 列表出现云下载任务。
+
+### 4.2 状态机
+
+**Status（115 下载侧）**
+
+| 值 | 进入条件 | 终态 |
+| :--- | :--- | :--- |
+| `queued` | 本地已建行，尚未提交 115 | 否 |
+| `submitted` | 115 已受理（`data[].state=true`） | 否 |
+| `downloading` | `get_task_list` 返回 status 0 或 1 | 否 |
+| `succeeded` | status 2 | **是**，进入 Pipeline |
+| `failed` | status -1 / 提交被拒 / 超时（默认 72h） | **是** |
+| `canceled` | 用户取消 | **是** |
+
+**Stage（后处理侧）**
+
+| 值 | 含义 |
+| :--- | :--- |
+| `pending` | 尚未开始（未成功） |
+| `waiting_sync` | 已成功，等待去抖窗口结束或等待同一目录的同步结束 |
+| `syncing` | STRM 增量同步执行中 |
+| `scanning` | 媒体库扫描中 |
+| `scraping` | 刮削已入队 |
+| `done` | 全链路完成 |
+| `na` | 同步目录已删除/禁用，跳过后续（不算失败） |
+| `failed` | 阶段失败，`StageError` 记录原因 |
+
+> Stage 失败**不回滚** Status；用户可对 Stage 失败的任务点「重做后处理」。
+
+---
+
+## 5. 115 开放平台对接
+
+### 5.1 接口清单
+
+| 用途 | 方法 | 路径 | 关键参数 | 关键返回 |
+| :--- | :--- | :--- | :--- | :--- |
+| 添加链接任务 | POST | `/open/offline/add_task_urls` | `urls`（换行分隔，≤115 条）、`wp_path_id` | `data[]{state,code,message,info_hash,url}` |
+| 解析 BT 种子 | POST | `/open/offline/torrent` | `torrent_sha1`、`pick_code` | `data{file_size,torrent_name,file_count,info_hash,torrent_filelist[]{size,path,wanted}}` |
+| 添加 BT 任务 | POST | `/open/offline/add_task_bt` | `info_hash`、`wanted`、`save_path`、`torrent_sha1`、`pick_code`、`wp_path_id` | `data[]`（成功为空数组） |
+| 任务列表 | GET | `/open/offline/get_task_list` | `page` | `data{page,page_count,count,tasks[]{...}}` |
+| 配额信息 | GET | `/open/offline/get_quota_info` | 无 | `data{package[]{surplus,used,count,name,expire_info[]},count,surplus,used}` |
+| 删除任务（P2） | POST | `/open/offline/del_task` | `info_hash`、`del_source_file` | `data[]` |
+| 清空任务（P2） | POST | `/open/offline/clear_task` | `flag`(0~5) | `data[]` |
+
+请求形态：`add_task_*` / `del_task` / `clear_task` / `torrent` 均为 **multipart/form-data**；`get_*` 为 GET query。全部走 `Authorization: Bearer <access_token>`，即现有 `doAuthJSON` 通道。
+
+### 5.2 任务列表字段（轮询用）
+
+| 字段 | 类型 | 用途 |
+| :--- | :--- | :--- |
+| `info_hash` | string | 首选匹配键 |
+| `url` | string | 回退匹配键（链接任务） |
+| `status` | int | -1 失败 / 0 分配中 / 1 下载中 / 2 成功 |
+| `percentDone` | int | 进度（**注意驼峰**，见 5.4） |
+| `size` | int | 任务总字节 |
+| `name` | string | 任务名，用于 UI |
+| `file_id` / `delete_file_id` | string | 完成后源文件/文件夹 ID（P2 裁剪用） |
+| `wp_path_id` | string | 落盘父目录，可用于校验目录一致性 |
+| `add_time` / `last_update` | int | 超时判断 |
+
+### 5.3 错误码映射（要落到用户可读文案）
+
+| 码 | 115 文案 | MeBox 提示 |
+| :--- | :--- | :--- |
+| `1000012` | 云下载配额已用完 | 「115 云下载配额已用尽，请在 115 端购买/领取配额后重试」 |
+| `91006` | 存储空间不足 | 「115 存储空间不足」 |
+| `20018` | 文件不存在或已删除 | 「种子文件找不到（可能已被清理），请重新上传 .torrent」 |
+| `1000011` | 链接数量超过 115 个 | 本地已按 115 条切批，正常不应触发；触发则记 warning 并重切 |
+| `990002` | 参数错误 | 「提交参数不被 115 接受」，附原始 message |
+| `980004` | 操作失败 | 可重试，走退避 |
+| 无权限/未开通 | —— | 「当前 115 应用未开通云下载权限」，并提示到开放平台申请（见风险 R1） |
+
+### 5.4 实现陷阱（必须按此实现）
+
+1. **`percentDone` 是驼峰**，`get_task_list` 其余字段是 snake_case。Go struct tag 必须写 `json:"percentDone"`，写错会永远 0 进度。
+2. **`data[].info_hash` 仅任务成功受理时返回**，可能为空 → 必须同时保存提交时的原始 `url` 做回退匹配，并对 url 做归一化（去首尾空白、统一小写协议头、去掉 `&` 后跟踪参数？**不做过度归一化**，仅 trim，避免误合并）。
+3. **`wanted` 索引基准未确认**（见 11 节实测项）。本期不做选文件，实现统一传 `wanted="0"`（官方文档唯一明确允许的取值），待真机确认后再决定是否改为全索引拼接。
+4. **`add_task_urls` 单批 ≤115**，超了服务端报 `1000011`；本地必须切批。
+5. **`wp_path_id=0` 表示根目录**，绝不能把「未选择目录」当 0 提交，否则文件落到 115 根目录，STRM 永远扫不到 → 提交前强校验 `WpPathID != "" && != "0"`。
+6. **`get_task_list` 只支持 page，无 page_size**，需按 `page_count` 翻页；轮询设页数上限（默认 10 页）防止账号任务堆积把一轮轮询拖爆。
+
+---
+
+## 6. 为什么磁力不能选文件（结论留档）
+
+| 接口 | 能否选择文件 | 依据 |
+| :--- | :--- | :--- |
+| `add_task_urls`（磁力/ed2k/http） | ❌ 无 wanted 参数 | `115doc/.../添加云下载链接任务.md` 请求参数仅 `urls`、`wp_path_id` |
+| `torrent`（解析种子） | ✅ 返回 `torrent_filelist[].wanted` | `解析BT种子.md` 返回字段表 |
+| `add_task_bt`（提交 BT） | ✅ `wanted` 必填 | `添加云下载BT任务.md` 请求参数表 |
+
+`torrent` 的入参是 **`torrent_sha1` + `pick_code`**，只能解析「已上传到本人 115 空间的 .torrent 文件」，不接受 magnet / info_hash。开放平台没有「解析磁力 → 文件列表」这一步，因此磁力链路从入口就没有选文件能力。
+
+**若要支持磁力选文件**，唯一路径是服务端自行把 magnet 抓成 .torrent（DHT metadata），属新增外部依赖与常驻网络行为，本期不做，记录为 P3 候选。
+
+---
+
+## 7. 后端实现
+
+### 7.1 文件清单
+
+**新增**
+
+| 文件 | 内容 |
+| :--- | :--- |
+| `internal/model/cloud_download.go` | `CloudDownloadTask` 模型 + 状态常量 |
+| `internal/repository/cloud_download_repository.go` | CRUD、按状态取活跃任务、按阶段取待推进任务、统计 |
+| `internal/service/cloud115/offline.go` | 4+2 个 API 封装、响应结构体、错误码常量与 `OfflineError` 类型 |
+| `internal/service/cloud_download.go` | `CloudDownloadService` 主体：构造、提交、取消、重试、列表、配额 |
+| `internal/service/cloud_download_input.go` | 输入解析（多行/类型判定/去重/切批 ≤115）、匹配键归一化 |
+| `internal/service/cloud_download_submit.go` | 链接提交 + `.torrent` 上传解析 → `add_task_bt`、暂存目录查找/创建 |
+| `internal/service/cloud_download_poll.go` | 轮询、状态映射、超时熔断、远程任务与本地记录对账 |
+| `internal/service/cloud_download_pipeline.go` | Stage 编排、去抖、等待同步、扫描、刮削、失败隔离 |
+| `internal/service/scheduler_cloud_download.go` | `jobCloudDownloadPoll` |
+| `internal/handler/cloud_download.go` | REST handler + multipart 种子上传 |
+| `internal/handler/routes_cloud_download.go` | 路由注册（在 `registerAdminStrmRoutes` 同级新增 `registerAdminCloudDownloadRoutes`） |
+| `web/src/types/cloudDownload.ts` | 前端类型 |
+| `web/src/api/cloudDownload.ts` | 前端 API |
+| `web/src/pages/CloudDownloadPage.tsx` | 页面（提交面板 + 任务列表 + 配额） |
+
+**修改**
+
+| 文件 | 改动 | 风险 |
+| :--- | :--- | :--- |
+| `internal/model/model.go` | `AllModels()` 追加 `&CloudDownloadTask{}` | 低（AutoMigrate 新增表） |
+| `internal/repository/repository.go` | `Container` 增加 `CloudDownload *CloudDownloadRepository` | 低 |
+| `internal/service/service.go` | `Container` 增加 `CloudDownload *CloudDownloadService`，`Start/Stop` 联动 | 低 |
+| `internal/service/strm_service.go` | 新增 `SetSyncFinishHook`、`Open115Client` | 中（新增导出方法，不改现有逻辑） |
+| `internal/service/strm_sync.go` | `finishSync` 末尾触发 hook（异步） | **中**：hook 里必须自带 recover + 超时，绝不能阻塞或 panic 影响同步协程 |
+| `internal/service/service_builder.go` | 构造 `CloudDownload`（在 `Strm` 之后），注入 Strm/Scan/Scraper/Tasks/Hub；回调 hook | 低 |
+| `internal/service/scheduler.go` | `Start()` 里 append `cloud_download_poll` job（仅在 `CloudDownload != nil` 时注册） | 低 |
+| `internal/repository/library_repository.go` | 新增 `FindEnabledRootsByLocalPath(ctx, localPath)`（归一化 + 前缀匹配） | 低 |
+| `web/src/appRoutes.tsx`、`web/src/components/layoutNavigation.ts` | 路由 + 侧边栏入口 | 低 |
+
+### 7.2 服务对外 API
+
+```go
+type CloudDownloadService struct{ /* cfg, log, repos, strm, scanner, scraper, tasks, hub */ }
+
+func (s *CloudDownloadService) Submit(ctx context.Context, req CloudDownloadSubmit) (*CloudDownloadSubmitResult, error)
+func (s *CloudDownloadService) SubmitTorrent(ctx context.Context, req CloudDownloadTorrentSubmit) (*CloudDownloadSubmitResult, error)
+func (s *CloudDownloadService) List(ctx context.Context, q CloudDownloadQuery) (*CloudDownloadPage, error)
+func (s *CloudDownloadService) Cancel(ctx context.Context, id string) error
+func (s *CloudDownloadService) Retry(ctx context.Context, id string) error          // 失败任务重新提交
+func (s *CloudDownloadService) RetryPipeline(ctx context.Context, id string) error // 仅重做后处理
+func (s *CloudDownloadService) Delete(ctx context.Context, id string) error
+func (s *CloudDownloadService) ClearFinished(ctx context.Context) (int64, error)
+func (s *CloudDownloadService) Quota(ctx context.Context, accountID string) (*OfflineQuota, error)
+func (s *CloudDownloadService) Start(ctx context.Context)  // 恢复中断任务
+func (s *CloudDownloadService) Stop()
+```
+
+`CloudDownloadSubmit`：`AccountID`、`SyncPathID`、`URLs []string`（一次提交多条）。
+`CloudDownloadSubmitResult`：逐条 `{source, task_id, ok, error}`，**部分成功必须返回 200 + 明细**。
+
+### 7.3 提交校验（顺序不可乱）
+
+1. `SyncPathID` 存在、`Enabled`、`Provider == cloud115`、`AccountID` 非空、`RemotePath` 为有效目录 ID 且 ≠ `"0"`；
+2. 账号存在且 `Enabled`，`Open115Client` 可取得；
+3. 配额预检：`get_quota_info` → `surplus <= 0` 时直接拒绝（批量多链接时按条数预估，无法精确预估大小，只做「配额是否耗尽」闸门）；
+4. 输入解析：按行拆分 → 类型判定 `magnet:?xt=urn:btih:` / `ed2k://` / `http(s)://` / `ftp://` → trim → 去重（同批内 + 与库内 `submitted/downloading` 任务去重）；
+5. 切批：每批 ≤115 条，逐批调用 `add_task_urls`；
+6. 逐条落库：`data[].state=true` → `submitted`；失败 → `failed` + 错误码映射文案。
+
+### 7.4 轮询实现要点
+
+```
+每 tick（默认 60s）：
+  1. 取所有 status IN (submitted, downloading) 的任务，按 account_id 分组
+  2. 无活跃任务 → 直接返回（不打 115 接口）
+  3. 对每个账号：
+       翻页取 get_task_list（page=1..min(page_count, 10)）
+       构建索引：info_hash(大写) → task，url(trim) → task
+       逐条匹配本地记录：
+          - info_hash 命中优先
+          - 否则 url 命中
+          - 都未命中 → 记 LastPollAt，未超时前不判失败（115 受理有延迟）
+       状态映射 + 更新 Percent/SizeBytes/Name
+       status=2 → succeeded + CompletedAt + Stage=pending
+       status=-1 → failed（Error 用 115 文案）
+  4. 超时：submitted/downloading 且 add_time 早于 now-72h → failed「下载超时」
+```
+
+### 7.5 Pipeline 实现要点
+
+```
+推进循环（可挂在同一 tick 之后，也可独立每 15s）：
+  A. 取 status=succeeded AND stage IN (pending, waiting_sync, failed) 的任务，按 sync_path_id 分组
+     - 每组内若有任务 completed_at 在去抖窗口内（默认 30s）→ 本轮跳过（等凑批）
+  B. 对每个 syncPath：
+     - 若 IsSyncRunning(pathID) → 全部置 waiting_sync，下一轮再看
+     - 否则 StartSync(pathID, incremental)，置 syncing，记录 StrmRecordID（取该 path 最新记录）
+  C. 同步完成后（hook）：
+     - 置 scanning → 反查 library（LocalPath 与 LibraryRoot.Path 归一化后相等或为其子目录）
+     - 无匹配库 → Stage=na + StageError「本地目录未加入任何媒体库」
+     - ScanLibrary(libraryID) → ScanAdded
+     - 置 scraping → EnqueueLibrary(libraryID, ScrapeOptions{}) → ScrapeQueued
+     - 置 done
+  D. 任一步失败：Stage=failed + StageError，不重试（等待用户点「重做后处理」）
+  E. 进程重启：Start() 时把 syncing/scanning/scraping 的僵尸阶段重置为 pending（参考 StrmService.recoverInterruptedSyncs 的写法）
+```
+
+去抖细节：以 `syncPathID` 为单位，服务内存里维护 `lastTrigger[pathID] = time`；窗口内到达的任务全部 `waiting_sync`，窗口结束时由首个触发者发起同步。
+
+### 7.6 STRM 完成回调
+
+```go
+// strm_service.go
+func (s *StrmService) SetSyncFinishHook(fn func(ctx context.Context, syncPathID, status string)) { ... }
+```
+
+在 `finishSync`（`strm_sync.go:323`）**落库完成之后**调用：
+
+```go
+if hook := s.syncFinishHook(); hook != nil {
+    helper.Go(s.log, "strm.syncFinishHook", func() {
+        ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
+        defer cancel()
+        hook(ctx, p.ID, status)
+    })
+}
+```
+
+要点：**异步 + 自带 recover + 超时**，绝不能让 hook 的 panic 或阻塞影响同步协程；也不要在 `finishSync` 里同步调用扫描（同步耗时长，会拖住同步收尾与 Pending 记录）。
+
+### 7.7 调度与配置项
+
+设置项（沿用 `repo.Setting`，键名与现有 `scrape.*` / `strm.*` 风格一致）：
+
+| 键 | 默认 | 说明 |
+| :--- | :--- | :--- |
+| `cloud_download.poll_interval_sec` | `60` | 轮询间隔（30~600） |
+| `cloud_download.sync_debounce_sec` | `30` | 同一同步目录的去抖窗口（0~300） |
+| `cloud_download.auto_scrape` | `true` | 同步后是否自动刮削 |
+| `cloud_download.task_timeout_hours` | `72` | 下载超时判定 |
+| `cloud_download.torrent_max_mb` | `20` | `.torrent` 上传大小上限 |
+| `cloud_download.max_pages` | `10` | 单轮轮询最大翻页数 |
+
+`auto_scrape=true` 时**不受** `scrape.auto_on_scan` 全局开关约束（用户显式提交了下载，期望链路闭环）；但若 `Scraper.AnyEnabled()==false`（无任何刮削源），Stage 直接置 `done` 并在 `StageError` 记「未配置刮削源」。
+
+### 7.8 HTTP 路由与鉴权
+
+挂在 `registerAdminStrmRoutes` 同组（`admin`，已带 `AuthRequired` + `AdminRequired`）：
+
+```go
+admin.GET("/cloud-downloads", listCloudDownloadsHandler(svc))
+admin.POST("/cloud-downloads", createCloudDownloadsHandler(svc))
+admin.POST("/cloud-downloads/torrent", uploadCloudDownloadTorrentHandler(svc)) // multipart
+admin.GET("/cloud-downloads/quota", cloudDownloadQuotaHandler(svc))
+admin.POST("/cloud-downloads/:id/retry", retryCloudDownloadHandler(svc))
+admin.POST("/cloud-downloads/:id/retry-pipeline", retryCloudDownloadPipelineHandler(svc))
+admin.POST("/cloud-downloads/:id/cancel", cancelCloudDownloadHandler(svc))
+admin.DELETE("/cloud-downloads/:id", deleteCloudDownloadHandler(svc))
+admin.POST("/cloud-downloads/clear-finished", clearFinishedCloudDownloadsHandler(svc))
+```
+
+multipart 端点：`file`（.torrent）+ `account_id` + `sync_path_id`；实现需 `c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, maxMB<<20)`，并校验文件头（BT 种子是 bencode，以 `d` 开头，含 `announce` / `info`）。
+
+---
+
+## 8. 前端实现
+
+### 8.1 页面结构（`CloudDownloadPage.tsx`）
+
+**顶部：提交面板**
+- 目标同步目录下拉：复用 `GET /admin/strm/paths`，只列 `provider=cloud115 && enabled`，展示 `name + remote_display_path + local_path`；
+- 账号显示：由所选同步目录自动带出（`account_id`），无需二次选择；
+- 链接文本框：多行粘贴，右下角实时显示「识别到 N 条：磁力 x / ed2k y / http z」；
+- `.torrent` 拖拽/选择：单文件，提交时走 multipart 端点；
+- 配额条：`surplus/count`，耗尽时提交按钮禁用并提示；
+- 提交结果：逐条成功/失败明细（不合并成一句「提交失败」）。
+
+**下方：任务列表**
+- 列：来源（截断显示 + tooltip 全量）、目标目录、Size、下载进度、**阶段徽标**（下载中 / 等待同步 / 同步中 / 扫描中 / 刮削中 / 完成 / 失败）、时间、操作；
+- 操作：取消（仅下载中）、重试（失败）、重做后处理（Stage 失败）、删除（终态）；
+- 批量：清空已完成；
+- 刷新：复用现有 WS Hub（`hub.Publish("cloud_download", …)`），断线时降级为 5s 轮询。
+
+### 8.2 路由与导航
+
+- `appRoutes.tsx`：`{ path: 'cloud-downloads', element: <CloudDownloadPage />, adminOnly: true }`
+- `layoutNavigation.ts`：`LAYOUT_NAV_ITEMS` 中 `STRM 管理` 之后加 `{ to: '/cloud-downloads', label: '云下载', icon: CloudDownload, adminOnly: true }`
+- `StrmManagePage` 顶部工具区加一个「云下载」跳转按钮，形成入口闭环。
+
+---
+
+## 9. 权限与安全
+
+### 9.1 鉴权
+
+首期仅管理员：路由挂在 `admin` 组，`AdminRequired` 中间件已覆盖。
+
+### 9.2 输入安全
+
+- 链接只做**字符串拼接转发**，服务端绝不主动发起对这些 URL 的请求（无 SSRF 面）；
+- `.torrent` 文件仅落临时目录 → 上传 115 → 删除，不本地解析 bencode（P1 若要预览文件名需加 bencode 解析，届时必须限大小与深度）；
+- 上传文件名禁用 `..` / 路径分隔符；
+- `save_path` 本期固定为空（留字段），避免路径穿越争议。
+
+### 9.3 后续（P2）
+
+`model.UserPermission` 增加 `CanUseCloudDownload bool`，配套 handler 从 `AdminRequired` 换成权限中间件，并给普通用户做配额上限（否则一个用户可以把账号的 115 云下载配额打空）。
+
+---
+
+## 10. 测试计划
+
+### 10.1 单元测试（必须）
+
+| 目标 | 用例 |
+| :--- | :--- |
+| 输入解析 | 多行混合、空行、重复链接、首尾空白、大小写协议头、>115 条切批、非法行跳过并计数 |
+| 状态映射 | status -1/0/1/2 → failed/downloading/downloading/succeeded；缺失 info_hash 时 url 回退命中；大小写 info_hash |
+| 错误码映射 | 1000012 / 91006 / 20018 / 990002 文案与是否可重试 |
+| 提交校验 | `RemotePath="0"`、账号禁用、同步目录禁用、配额耗尽 → 全部拒绝且不产生 115 请求 |
+| 去抖 | 30s 内 3 个任务完成 → 只触发 1 次 `StartSync` |
+| 等待同步 | `IsSyncRunning=true` → 全部 waiting_sync；结束后成功发起 |
+| 阶段隔离 | 同步失败不改变 Status；扫描失败不改变 syncing 记录 |
+| 僵尸恢复 | 重启后 syncing/scanning/scraping → pending |
+
+测试风格沿用仓库现状：同包 `*_test.go`、`t.Context()`、httptest 模拟 115（参考 `internal/service/cloud115/cloud115_test.go` 的 mock 模式）。
+
+### 10.2 集成测试
+
+- `httptest` 起伪 115（`/open/offline/*`）：验证提交 → 轮询 → 状态流转 → pipeline 触发（Strm 用 fake hook，Scanner/Scraper 用桩）。
+- 现有测试回归：`go test ./internal/service/... ./internal/repository/... ./internal/handler/...`。
+
+### 10.3 真机验收（不可省）
+
+| # | 步骤 | 期望 |
+| :--- | :--- | :--- |
+| 1 | 提交一条小体积磁力（<200MB）绑定某 115 同步目录 | 任务 5s 内变 `submitted` |
+| 2 | 等 115 完成 | 任务变 `succeeded`，随后 `syncing` |
+| 3 | 同步完成 | 本地目录出现新 `.strm` 文件 |
+| 4 | 自动扫描 | 媒体库新出现对应条目 |
+| 5 | 自动刮削 | 条目 `scrape_status` 变 `matched`，海报正确 |
+| 6 | 提交 `.torrent` 文件 | 同上，且 115 端任务名与种子内任务名一致 |
+| 7 | 提交 ed2k 链接 | 同上（ed2k 无 info_hash，验证 url 回退匹配） |
+| 8 | 提交 120 条链接 | 自动切 2 批，逐条结果完整 |
+
+---
+
+## 11. 待实测确认项
+
+| # | 项 | 影响 | 处理 |
+| :--- | :--- | :--- | :--- |
+| 1 | `add_task_bt` 的 `wanted` 是 0-based 还是 1-based | 后续若开放选文件，索引拼接依赖此语义 | 真机用一个 3 文件种子验证；当前实现统一传 `"0"`，不受此影响 |
+| 2 | `wanted="0"` 是「全部」还是「第 0 个」 | 决定 `.torrent` 任务是否只下一个文件 | **必测**：当前实现依赖它表示「全部」 |
+| 3 | `MkDir` 对已存在目录的返回 | 暂存目录重复创建 | 先 `FindNamedContentInParent` 查找，未命中再 `MkDir`；两者都失败则回退到目标同步目录 |
+| 4 | 当前 115 应用是否已开通云下载权限 | 全功能可用性 | 提交前 `get_quota_info` 探测；无权限时给出「去开放平台申请」指引 |
+| 5 | 磁力整体提交时 115 默认勾选哪些文件 | 是否漏下样片/字幕 | 不影响链路，只在文档说明 |
+| 6 | `get_task_list` 单页实际返回条数 | 翻页策略 | 首轮实测后调整 `max_pages` 默认值 |
+
+---
+
+## 11.5 实现状态（P0 已落地）
+
+已完成（后端 + 前端最小可用）：
+
+| 层 | 文件 | 说明 |
+| :--- | :--- | :--- |
+| 模型 | `internal/model/cloud_download.go` | `CloudDownloadTask` + 状态/阶段常量，已注册 `AllModels()` |
+| 仓储 | `internal/repository/cloud_download_repository.go` | 分页查询、活跃任务去重、阶段推进、僵尸阶段重置 |
+| 115 协议 | `internal/service/cloud115/offline.go` | 7 个接口封装；`client.go` 新增 multipart 请求构造并复用限流/刷新/错误封装 |
+| 服务 | `internal/service/cloud_download*.go` | 输入解析、提交、轮询、去抖、Pipeline（同步→扫描→刮削） |
+| 调度 | `internal/service/scheduler_cloud_download.go` | `cloud_download_poll` 周期任务 |
+| 打通 | `internal/service/strm_service.go` / `strm_sync.go` | `Open115Client` 复用缓存客户端；`SetSyncFinishHook` 异步回调 |
+| HTTP | `internal/handler/cloud_download.go` | 9 个管理员接口 + multipart 种子上传 |
+| 前端 | `web/src/pages/CloudDownloadPage.tsx` 等 | 提交面板、配额、任务列表、重试/取消/删除、5s 自动刷新 |
+
+P0 范围外（保留为 P1/P2）：
+
+- 设置项 UI（当前通过 `Setting` 表键值生效，默认轮询 60s / 去抖 30s / 超时 72h）；
+- WebSocket 实时进度（当前为 5s 轮询）；
+- 普通用户权限位与单用户配额上限；
+- 远端任务清理（`del_task` / `clear_task`）在 UI 上无入口（取消任务时会尽力调用 `del_task`）。
+
+验证证据：
+
+- `go build ./...`、`go vet` 通过；
+- 新增单测：`internal/service/cloud115/offline_test.go`（7 项，含 multipart 格式与 `percentDone` 解析）、`internal/service/cloud_download_test.go`（9 项，含解析/去抖/目录匹配/校验）；
+- 前端 `tsc --noEmit`、`eslint`、`vite build` 通过；
+- 3 个既有测试在本机 HEAD 上同样失败（Windows 文件占用与 SQLite `VACUUM INTO` 环境问题），已用独立 worktree 复核，与本次改动无关。
+
+## 12. 分期与验收
+
+### P0（可跑通，约 1 个迭代）
+
+- 模型 + 仓储 + 迁移注册
+- `cloud115/offline.go`（4 个接口：add_task_urls / get_task_list / get_quota_info / torrent + add_task_bt）
+- 提交（磁力/ed2k/http）+ 轮询 + 状态机
+- STRM finish hook + Pipeline（同步 → 扫描 → 刮削）
+- 调度 job + 设置项
+- 前端最小页：提交面板 + 任务列表（阶段徽标、重试、删除）
+- **验收**：10.3 的步骤 1~5、7、8 通过
+
+### P1（体验完善）
+
+- `.torrent` 上传端点 + 全选提交（10.3 步骤 6）
+- 配额条、提交结果逐条明细
+- 去抖、僵尸恢复、超时熔断
+- WS 实时进度
+- 分页列表 + 筛选（状态/目录）
+
+### P2（可选）
+
+- 远端任务清理（`del_task` / `clear_task`）
+- 完成后删除暂存 `.torrent`
+- 普通用户权限位 + 单用户配额上限
+- Telegram 完成通知
+
+### P3（本期不做，记录候选）
+
+- 磁力选文件（服务端 DHT 抓 .torrent）
+- 完成后按 file_id 裁剪不需要的文件
+
+---
+
+## 13. 风险与回滚
+
+| # | 风险 | 影响 | 缓解 |
+| :--- | :--- | :--- | :--- |
+| R1 | 115 应用未开通云下载权限 | 功能不可用 | 提交前探测 + 明确文案；不影响现有 STRM 功能 |
+| R2 | 令牌双实例互相作废 | 账号被标「授权已失效」 | **强约束 K1**：只复用 StrmService 缓存的客户端 |
+| R3 | 频繁同步打爆 CPU/115 限流 | 服务卡顿、风控 | 去抖 30s + 最小间隔 + 同步运行中等待 + throttle_manager |
+| R4 | 目录错配（`wp_path_id` 不在同步目录） | 下了但永远扫不到 | 提交时强制 `RemotePath` 非空非 0；UI 只允许选同步目录，不放开自由选目录 |
+| R5 | finish hook panic 拖垮同步 | 同步记录永远 running | hook 异步 + `helper.Go` + recover + 独立超时 |
+| R6 | 新增表迁移失败 | 启动失败 | `AutoMigrate` 加表无破坏性；出问题回滚只需删表 + 移除注册 |
+| R7 | 单页页数过多导致轮询耗时 | 轮询堆积 | `max_pages` 上限；超限记 warning 并下轮继续 |
+
+**回滚方式**：移除路由与侧边栏入口即可（功能面隐藏）；表可保留（不影响其它子系统），或手动 `DROP TABLE cloud_download_tasks`。
+
+---
+
+## 14. 附录：核对依据
+
+| 结论 | 依据位置 |
+| :--- | :--- |
+| 115 开放平台离线接口形态与参数 | `115doc/115开放平台/API列表/云下载/*.md` |
+| STRM 同步入口与运行互斥 | `internal/service/strm_sync.go:82-138` |
+| 同步收尾无回调 | `internal/service/strm_sync.go:323`（`finishSync`） |
+| 115 目录整树拉取成本 | `internal/service/strm_sync.go:682`（`walk115Flat`） |
+| 令牌刷新落库与单实例要求 | `internal/service/strm_service.go:524-556`、`strm_115_oauth.go:438` |
+| 115 provider 断言复用范式 | `internal/service/strm_sync.go:378`（`cloud.OpenAPI115Provider`） |
+| 上传种子可拿 PickCode | `internal/service/cloud115/upload.go:95-102,217` |
+| 刮削候选只挑 pending | `internal/service/scraper_library.go:183-207` |
+| 扫描自动刮削开关 | `internal/service/scanner_prune.go:279`、`scanner_post_scan.go:19` |
+| 周期任务注册范式 | `internal/service/scheduler.go:118-210` |
+| 模型迁移注册 | `internal/model/model.go:37`、`internal/database/schema_migration.go:34` |
+| 服务装配顺序 | `internal/service/service_builder.go:148` |
@@ -0,0 +1,46 @@
+# Playback Correctness and Isolation Implementation Plan
+
+**Goal:** Fix the five playback defects from the 2026-10-21 review and make playback capability queries side-effect-free, without replacing the player or adding dependencies.
+
+**Scope:** The user approved implementing the reviewed fixes. Work in the current clean checkout; do not commit, push, deploy, or alter unrelated files.
+
+## Design and invariants
+
+- Keep existing media IDs, stream routes, direct playback and external-player URLs compatible.
+- Add optional `session_id` to local HLS requests. Authenticated handlers supply the actual user identity; a client parameter never supplies the owner. New web playback sessions use random IDs. Legacy clients are isolated by user and, where available, Emby play-session/device identity.
+- Keep transcoder media lookup/logging separate from its internal task key. A task key incorporates user, media and playback session. Each actual ffmpeg run writes to a fresh generation directory, so delayed segment requests never read a replacement run's output.
+- Stop only the authenticated caller's playback session. Check media visibility and scoped playback tokens on stop, just as on playlist/segment requests. Segment and playlist queries must match the running generation.
+- Cloud child requests resolve their real session media first, compare query media, enforce token scope and visibility against the real media, and reject mismatches before upstream fetch.
+- Treat player business positions as absolute source seconds. Only local HLS converts to/from a relative ffmpeg timeline.
+- Invalidate outstanding cloud-transcode requests on media/unmount, explicit source/quality changes, and newer requests. Guard both fulfilled and rejected responses.
+- Select local fallbacks only from available local qualities. Keep the existing 115-first preference when a cloud quality is available.
+- `PlaybackInfo` only reads capabilities/status. Explicit `StartTranscode` requests enqueue cloud work. Retain pending/ready response contracts, polling, and retries.
+
+## Tasks
+
+1. Add regression tests for local-scope isolation, stale generations, stop authorization, cloud media binding, pure capability reads, timeline conversion, available-local selection and stale async results. Run tests before implementation and verify the intended failures.
+2. Add tested playback helpers; route skip/undo/progress/quality/subtitle calculations through the common absolute timeline; guard cloud transcode results and fix local fallback choice.
+3. Extend existing transcoder/stream methods with an optional scope, preserve legacy internal calls, isolate task keys/output directories, and pass caller scope from web and Emby handlers. Bind web local HLS URLs and stop requests to captured session IDs.
+4. Enforce real-media authorization on cloud child requests and authenticated ownership on local stop.
+5. Split read-only cloud capability lookup from explicit cloud enqueue. Update existing cloud tests to use the explicit start operation and test no push during reads.
+6. Run focused and full Go tests, frontend tests, TypeScript/Vite build, lint diagnostics and review the diff for security, lifecycle and API compatibility. Fix regressions before reporting completion.
+
+## Verification commands
+
+- `node --experimental-strip-types --test src/pages/hlsPlayback.test.ts src/pages/directPlaySeek.test.ts src/pages/playerPageModel.test.ts src/pages/playbackQuality.test.ts src/pages/playbackRequestGuard.test.ts src/utils/skipSegments.test.ts`
+- `go test ./internal/service ./internal/handler ./internal/middleware -count=1`
+- `go test ./...`
+- `npm run build` and targeted ESLint for changed frontend files.
+
+## Out of scope
+
+New remux/audio-only ffmpeg pipelines, speculative browser codec policy changes, player replacement, broad UI refactors, performance improvement claims without measurements, and production deployment.
+
+## Verification outcome
+
+- Six frontend playback regression scripts pass; targeted ESLint and the TypeScript/Vite production build pass. The existing bundle-size warning remains.
+- Playback/stream/transcode/progress tests in service, handler and middleware pass, including scoped output reads, stale generation rejection, scoped stops, device-to-segment propagation, read-only capability queries and concurrent cloud start deduplication.
+- Whole-repository tests pass with only `TestQueueLibraryRootScanImportsNewLibraryMedia` and `TestSQLiteRestoreStagesWithoutChangingLiveDatabase` excluded. Both were run independently and reproduce Windows file-lock / SQLite errors in unmodified scan/database code. They are not silently disabled in source.
+- FFmpeg is not installed in this environment, so the existing real-transcode lifecycle test skips. Actual video, upstream 115 and browser end-to-end playback remain unverified.
+- Clients with no playback-session or device identifier retain per-user legacy isolation; new web requests always carry an independent session ID.
+- No commit, push or deployment was performed.
@@ -45,14 +45,13 @@ func setDefaults(v *viper.Viper) {
 	v.SetDefault("logging.max_backups", 10)

 	v.SetDefault("cache.cache_dir", "./cache")
-	v.SetDefault("cache.images_max_size_mb", 2000)
+	v.SetDefault("cache.images_max_size_mb", 2048)
 	v.SetDefault("cache.images_originals_max_size_mb", 256)
-	v.SetDefault("cache.images_originals_ttl_hours", 168)
 	v.SetDefault("cache.memory_max_size_mb", DefaultCacheMemoryMaxSizeMB)
 	v.SetDefault("cache.redis_url", "")
 	v.SetDefault("cache.redis_prefix", "mebox")
 	v.SetDefault("cache.media_ttl_seconds", 90)
-	v.SetDefault("cache.emby_latest_ttl_seconds", 300)
+	v.SetDefault("cache.emby_latest_ttl_seconds", 900)
 	v.SetDefault("cache.reader_content_max_size_mb", 1024)
 	v.SetDefault("cache.reader_content_ttl_hours", 168)
 	v.SetDefault("cache.reader_files_ttl_hours", 720)
@@ -50,9 +50,6 @@ func (c *Config) normalize() error {
 	if c.Cache.ImagesOriginalsMaxSizeMB < 0 {
 		c.Cache.ImagesOriginalsMaxSizeMB = 0
 	}
-	if c.Cache.ImagesOriginalsTTLHours < 0 {
-		c.Cache.ImagesOriginalsTTLHours = 0
-	}
 	if c.Cache.MemoryMaxSizeMB <= 0 {
 		c.Cache.MemoryMaxSizeMB = DefaultCacheMemoryMaxSizeMB
 	}
@@ -120,14 +120,16 @@ type LoggingConfig struct {

 // CacheConfig 控制磁盘转写缓存和进程内热缓存。
 type CacheConfig struct {
-	CacheDir        string `mapstructure:"cache_dir"`
-	ImagesMaxSizeMB int    `mapstructure:"images_max_size_mb"`
+	CacheDir string `mapstructure:"cache_dir"`
+	// ImagesMaxSizeMB 是整个磁盘缓存的总容量上限（MB），不是 images 子目录
+	// 的配额。参与统计的池为 hls、images、library-covers；超限时按该顺序淘汰
+	// 最旧文件。reader-audio 不在其中：它按 reader.audioMediaMaxBytes 的固定
+	// 配额（当前 1GiB）在写入时独立淘汰，不参与这里的总量。
+	// 0 表示不限制。
+	ImagesMaxSizeMB int `mapstructure:"images_max_size_mb"`
 	// ImagesOriginalsMaxSizeMB 限制 cache/images 下原图子配额（MB）。原图只是
 	// 生成缩略图的原料，丢了可以重新回源；0 表示不单独限制（只受总量约束）。
 	ImagesOriginalsMaxSizeMB int `mapstructure:"images_originals_max_size_mb"`
-	// ImagesOriginalsTTLHours 是原图的保留时长（小时），超过即删除；0 表示
-	// 不按时间淘汰。缩短它能让原图缓存保持在一个滚动窗口内。
-	ImagesOriginalsTTLHours int `mapstructure:"images_originals_ttl_hours"`
 	// MemoryMaxSizeMB 限制进程内 L1 缓存总字节数，JSON/对象缓存共用该预算。
 	MemoryMaxSizeMB int    `mapstructure:"memory_max_size_mb"`
 	RedisURL        string `mapstructure:"redis_url"`
@@ -136,7 +138,8 @@ type CacheConfig struct {
 	// EmbyLatestTTLSeconds 是 Emby「最新添加」(Items/Latest) 的缓存时长。
 	// 客户端刷新首页时会并发请求全部媒体库的 Latest（生产环境观察到 73 个
 	// 并发），缓存过短会让这批请求同时穿透并各自重建 payload，在低配主机
-	// 上造成秒级延迟。默认 300 秒，新入库内容最迟 5 分钟后出现在最新列表。
+	// 上造成秒级延迟。默认 900 秒；过期后仍会先返回陈旧副本并在后台重建，
+	// 新入库内容最迟 15 分钟后出现在最新列表（扫描完成会主动失效缓存）。
 	EmbyLatestTTLSeconds int `mapstructure:"emby_latest_ttl_seconds"`
 	// ReaderContentMaxSizeMB 阅读正文持久缓存的总容量（MB），0 表示不限制。
 	ReaderContentMaxSizeMB int `mapstructure:"reader_content_max_size_mb"`
@@ -376,6 +376,11 @@ func ensurePerformanceIndexes(db *gorm.DB) error {
 		`DROP INDEX IF EXISTS idx_media_library_release_active`,
 		`CREATE INDEX IF NOT EXISTS idx_media_library_created_active ON media(library_id, created_at DESC) WHERE deleted_at IS NULL`,
 		`CREATE INDEX IF NOT EXISTS idx_media_library_episode_active ON media(library_id, season_num, episode_num, created_at DESC) WHERE deleted_at IS NULL`,
+		// 虚拟剧集分组索引：series_id 为空的剧集行要按
+		// (season_num, episode_num, episode_fraction, created_at) 排序后做内存
+		// 分组。没有它 SQLite 只能全表扫描再建临时 B-tree，而 Emby 的
+		// 卡片/海报查询每次只关心其中一部剧（生产环境实测单次 1.3s）。
+		`CREATE INDEX IF NOT EXISTS idx_media_virtual_series_group ON media(season_num, episode_num, episode_fraction, created_at) WHERE deleted_at IS NULL AND (series_id IS NULL OR series_id = '')`,
 		`CREATE INDEX IF NOT EXISTS idx_media_library_root_active ON media(library_id, library_root_id) WHERE deleted_at IS NULL`,
 		`CREATE INDEX IF NOT EXISTS idx_media_series_active ON media(series_id, season_num, episode_num) WHERE deleted_at IS NULL`,
 		`CREATE INDEX IF NOT EXISTS idx_media_library_series_active ON media(library_id, series_id, season_num, episode_num) WHERE deleted_at IS NULL`,
@@ -0,0 +1,189 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+	"io"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/config"
+)
+
+var sqliteRestoreMu sync.Mutex
+
+func sqliteRestorePath(cfg *config.Config) (string, error) {
+	if cfg == nil || strings.TrimSpace(cfg.Database.DBPath) == "" || cfg.Database.DBPath == ":memory:" || strings.HasPrefix(cfg.Database.DBPath, "file:") {
+		return "", errors.New("恢复需要配置有效的 SQLite 数据库文件路径")
+	}
+	return filepath.Abs(cfg.Database.DBPath)
+}
+
+func sqliteRestoreDSN(path, mode string) string {
+	u := url.URL{Scheme: "file", Path: filepath.ToSlash(path)}
+	q := url.Values{"mode": {mode}, "_pragma": {"busy_timeout(5000)"}}
+	u.RawQuery = q.Encode()
+	return u.String()
+}
+
+func validateSQLiteRestore(ctx context.Context, path string) error {
+	info, err := os.Lstat(path)
+	if err != nil {
+		return err
+	}
+	if !info.Mode().IsRegular() {
+		return errors.New("备份必须是常规文件")
+	}
+	db, err := sql.Open("sqlite", sqliteRestoreDSN(path, "ro"))
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+	var result string
+	if err := db.QueryRowContext(ctx, "PRAGMA quick_check").Scan(&result); err != nil {
+		return fmt.Errorf("SQLite 备份校验失败: %w", err)
+	}
+	if result != "ok" {
+		return fmt.Errorf("SQLite 备份校验失败: %s", result)
+	}
+	var tables int
+	if err := db.QueryRowContext(ctx, "SELECT COUNT(*) FROM sqlite_master WHERE type = 'table' AND name IN ('users', 'media', 'settings')").Scan(&tables); err != nil {
+		return err
+	}
+	if tables == 0 {
+		return errors.New("备份不包含 MeBox 数据表")
+	}
+	return nil
+}
+
+// StageSQLiteRestore leaves the live database and its WAL untouched. The
+// validated copy is applied on the next startup, before any database is opened.
+func StageSQLiteRestore(ctx context.Context, cfg *config.Config, source string) error {
+	sqliteRestoreMu.Lock()
+	defer sqliteRestoreMu.Unlock()
+	dbPath, err := sqliteRestorePath(cfg)
+	if err != nil {
+		return err
+	}
+	pending := dbPath + ".restore-pending"
+	if _, err := os.Lstat(pending); err == nil {
+		return errors.New("已有等待恢复的备份，请重启 MeBox 后再操作")
+	} else if !errors.Is(err, os.ErrNotExist) {
+		return err
+	}
+	if err := validateSQLiteRestore(ctx, source); err != nil {
+		return err
+	}
+	in, err := os.Open(source)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+	out, err := os.CreateTemp(filepath.Dir(dbPath), ".mebox-restore-*")
+	if err != nil {
+		return err
+	}
+	tmp := out.Name()
+	defer os.Remove(tmp)
+	if _, err := io.Copy(out, in); err != nil {
+		_ = out.Close()
+		return err
+	}
+	if err := out.Sync(); err != nil {
+		_ = out.Close()
+		return err
+	}
+	if err := out.Close(); err != nil {
+		return err
+	}
+	if err := validateSQLiteRestore(ctx, tmp); err != nil {
+		return err
+	}
+	return os.Rename(tmp, pending)
+}
+
+// ApplyPendingSQLiteRestore must run before database.Open and before workers or
+// HTTP listeners start. The previous database is retained alongside the file.
+func ApplyPendingSQLiteRestore(ctx context.Context, cfg *config.Config, log *zap.Logger) error {
+	if cfg == nil {
+		return nil
+	}
+	dialect := normalizeDatabaseType(cfg.Database.Type)
+	if dialect == "auto" {
+		dialect = effectiveAutoDatabaseType(cfg)
+	}
+	if dialect != "sqlite" {
+		return nil
+	}
+	sqliteRestoreMu.Lock()
+	defer sqliteRestoreMu.Unlock()
+	dbPath, err := sqliteRestorePath(cfg)
+	if err != nil {
+		return err
+	}
+	pending := dbPath + ".restore-pending"
+	if _, err := os.Lstat(pending); errors.Is(err, os.ErrNotExist) {
+		return nil
+	} else if err != nil {
+		return err
+	}
+	if err := validateSQLiteRestore(ctx, pending); err != nil {
+		return err
+	}
+	previous := ""
+	if _, err := os.Lstat(dbPath); err == nil {
+		// A clean checkpoint prevents an old WAL from being replayed into the
+		// replacement database. A busy checkpoint leaves all files untouched.
+		live, err := sql.Open("sqlite", sqliteRestoreDSN(dbPath, "rw"))
+		if err != nil {
+			return err
+		}
+		var busy, pages, copied int
+		err = live.QueryRowContext(ctx, "PRAGMA wal_checkpoint(TRUNCATE)").Scan(&busy, &pages, &copied)
+		closeErr := live.Close()
+		if err != nil {
+			return err
+		}
+		if closeErr != nil {
+			return closeErr
+		}
+		if busy != 0 {
+			return errors.New("SQLite 数据库仍被占用，恢复已保留等待下次启动")
+		}
+		old, err := os.CreateTemp(filepath.Dir(dbPath), filepath.Base(dbPath)+".before-restore-*")
+		if err != nil {
+			return err
+		}
+		previous = old.Name()
+		if err := old.Close(); err != nil {
+			return err
+		}
+		if err := os.Remove(previous); err != nil {
+			return err
+		}
+		if err := os.Rename(dbPath, previous); err != nil {
+			return err
+		}
+	} else if !errors.Is(err, os.ErrNotExist) {
+		return err
+	}
+	if err := os.Rename(pending, dbPath); err != nil {
+		if previous != "" {
+			if rollbackErr := os.Rename(previous, dbPath); rollbackErr != nil {
+				return fmt.Errorf("恢复失败: %w；回退失败: %v，原数据库保留于 %s", err, rollbackErr, previous)
+			}
+		}
+		return err
+	}
+	if log != nil {
+		log.Warn("SQLite backup restored before startup", zap.String("previous_database", previous))
+	}
+	return nil
+}
@@ -0,0 +1,104 @@
+package database
+
+import (
+	"database/sql"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/truewhile/MeBox/internal/config"
+)
+
+func TestSQLiteRestoreStagesWithoutChangingLiveDatabase(t *testing.T) {
+	root := t.TempDir()
+	cfg := &config.Config{}
+	cfg.Database.Type = "sqlite"
+	cfg.Database.DBPath = filepath.Join(root, "live.db")
+	live, err := sql.Open("sqlite", sqliteRestoreDSN(cfg.Database.DBPath, "rwc"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer live.Close()
+	for _, statement := range []string{
+		"PRAGMA journal_mode=WAL", "CREATE TABLE settings (key TEXT PRIMARY KEY, value TEXT)",
+		"INSERT INTO settings VALUES ('state', 'backup')",
+	} {
+		if _, err := live.Exec(statement); err != nil {
+			t.Fatal(err)
+		}
+	}
+	source := filepath.Join(root, "backup.db")
+	if _, err := live.Exec("VACUUM INTO ?", source); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := live.Exec("UPDATE settings SET value = 'live'"); err != nil {
+		t.Fatal(err)
+	}
+	if err := StageSQLiteRestore(t.Context(), cfg, source); err != nil {
+		t.Fatal(err)
+	}
+	var value string
+	if err := live.QueryRow("SELECT value FROM settings").Scan(&value); err != nil || value != "live" {
+		t.Fatalf("staging changed live database: value=%q err=%v", value, err)
+	}
+	if _, err := live.Exec("UPDATE settings SET value = 'after-stage'"); err != nil {
+		t.Fatalf("database could not write after staging: %v", err)
+	}
+	if err := StageSQLiteRestore(t.Context(), cfg, source); err == nil {
+		t.Fatal("second staging should not replace the pending restore")
+	}
+	if err := os.Remove(source); err != nil {
+		t.Fatal(err)
+	}
+	if err := live.Close(); err != nil {
+		t.Fatal(err)
+	}
+	if err := ApplyPendingSQLiteRestore(t.Context(), cfg, nil); err != nil {
+		t.Fatal(err)
+	}
+	restored, err := sql.Open("sqlite", sqliteRestoreDSN(cfg.Database.DBPath, "ro"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer restored.Close()
+	if err := restored.QueryRow("SELECT value FROM settings").Scan(&value); err != nil || value != "backup" {
+		t.Fatalf("restore failed: value=%q err=%v", value, err)
+	}
+	previous, err := filepath.Glob(cfg.Database.DBPath + ".before-restore-*")
+	if err != nil || len(previous) != 1 {
+		t.Fatalf("previous database not preserved: files=%v err=%v", previous, err)
+	}
+	old, err := sql.Open("sqlite", sqliteRestoreDSN(previous[0], "ro"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer old.Close()
+	if err := old.QueryRow("SELECT value FROM settings").Scan(&value); err != nil || value != "after-stage" {
+		t.Fatalf("old database lost latest writes: value=%q err=%v", value, err)
+	}
+	if err := ApplyPendingSQLiteRestore(t.Context(), cfg, nil); err != nil {
+		t.Fatalf("repeat startup: %v", err)
+	}
+}
+
+func TestSQLiteRestoreRejectsCorruptAndSymlinkBackups(t *testing.T) {
+	root := t.TempDir()
+	cfg := &config.Config{}
+	cfg.Database.DBPath = filepath.Join(root, "live.db")
+	source := filepath.Join(root, "corrupt.db")
+	if err := os.WriteFile(source, []byte("not a SQLite database"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	if err := StageSQLiteRestore(t.Context(), cfg, source); err == nil {
+		t.Fatal("corrupt backup accepted")
+	}
+	link := filepath.Join(root, "link.db")
+	if err := os.Symlink(source, link); err == nil {
+		if err := StageSQLiteRestore(t.Context(), cfg, link); err == nil {
+			t.Fatal("symlink backup accepted")
+		}
+	}
+	if _, err := os.Stat(cfg.Database.DBPath + ".restore-pending"); !os.IsNotExist(err) {
+		t.Fatalf("failed validation left pending data: %v", err)
+	}
+}
@@ -87,9 +87,9 @@ func updateSettingHandler(svc *service.Container) gin.HandlerFunc {
 		if req.Key == "transcode.hw_enabled" || req.Key == "transcode.hw_accel" || req.Key == "transcoder.hardware_accel" || req.Key == "transcoder.encoder" {
 			svc.Transcoder.StopAll()
 		}
-		if req.Key == "cache.images_max_size_mb" || req.Key == "cache.images_originals_max_size_mb" || req.Key == "cache.images_originals_ttl_hours" {
+		if req.Key == "cache.images_max_size_mb" || req.Key == "cache.images_originals_max_size_mb" {
 			if svc.Scheduler != nil {
-				_ = svc.Scheduler.RunNowAsync(c.Request.Context(), "image_cache_cleanup")
+				_ = svc.Scheduler.RunNowAsync(c.Request.Context(), "cache_cleanup")
 			}
 		}
 		if req.Key == "cache.memory_max_size_mb" && svc.Cache != nil {
@@ -0,0 +1,18 @@
+package handler
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+func backgroundTasksHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if svc == nil || svc.Tasks == nil {
+			c.JSON(http.StatusOK, service.TaskSnapshot{Active: []service.BackgroundTask{}, Recent: []service.BackgroundTask{}})
+			return
+		}
+		c.JSON(http.StatusOK, svc.Tasks.Snapshot())
+	}
+}
@@ -3,6 +3,7 @@ package handler

 import (
 	"net/http"
+	"path/filepath"

 	"github.com/gin-gonic/gin"

@@ -41,12 +42,28 @@ func deleteBackupHandler(svc *service.Container) gin.HandlerFunc {
 	}
 }

+func downloadBackupHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		filename := c.Query("filename")
+		path, err := svc.Backup.ResolvePath(filename)
+		if err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		c.FileAttachment(path, filepath.Base(path))
+	}
+}
+
 func restoreBackupHandler(svc *service.Container) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		if err := svc.Backup.Restore(c.Request.Context(), c.Query("filename")); err != nil {
 			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 			return
 		}
-		c.JSON(http.StatusOK, gin.H{"message": "restored — restart the server to apply"})
+		message := "数据库已恢复，请重启 MeBox 以刷新运行时配置"
+		if svc.Repo.DB.Dialector.Name() == "sqlite" {
+			message = "备份已校验并暂存，请重启 MeBox 后应用恢复"
+		}
+		c.JSON(http.StatusOK, gin.H{"message": message, "restart_required": true})
 	}
 }
@@ -124,10 +124,32 @@ func cloud115HLSSessionHandler(svc *service.Container) gin.HandlerFunc {
 			c.JSON(http.StatusBadRequest, gin.H{"error": "missing media_id"})
 			return
 		}
-		if !enforceScopedPlaybackToken(c, mediaID) {
+		if c.Request.Context().Err() != nil {
+			c.AbortWithStatus(499)
 			return
 		}
-		err := svc.Cloud115.HLSProxy().ServeChild(
+		actualMediaID, err := svc.Cloud115.HLSProxy().SessionMediaID(c.Param("session"), c.Param("key"))
+		if err != nil {
+			c.JSON(http.StatusNotFound, gin.H{"code": "hls_session_not_found", "error": "hls session not found"})
+			return
+		}
+		if mediaID != actualMediaID {
+			c.JSON(http.StatusForbidden, gin.H{"error": "playback session media mismatch"})
+			return
+		}
+		if !enforceScopedPlaybackToken(c, actualMediaID) {
+			return
+		}
+		if svc.Repo == nil || svc.Repo.Media == nil {
+			c.JSON(http.StatusNotFound, gin.H{"error": "media not found"})
+			return
+		}
+		m, findErr := svc.Repo.Media.FindByID(c.Request.Context(), actualMediaID)
+		if findErr != nil || m == nil || !mediaVisibleForRequest(c, svc, m) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "media not found"})
+			return
+		}
+		err = svc.Cloud115.HLSProxy().ServeChild(
 			c.Request.Context(),
 			c.Writer,
 			c.Request,
@@ -0,0 +1,163 @@
+// 云下载（115 离线下载）HTTP 接口。
+//
+// 全部挂在 /api/admin 下（管理员专用）：首期不开放普通用户，否则单个用户
+// 可以把账号的 115 云下载配额打空（见 docs/cloud-download-plan.md 第 9 节）。
+package handler
+
+import (
+	"io"
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/truewhile/MeBox/internal/repository"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+// cloudDownloadUploadHardLimit 是 .torrent 上传的硬上限（字节）。
+// 真实上限由设置项 cloud_download.torrent_max_mb 控制，这里只防内存打爆。
+const cloudDownloadUploadHardLimit = 256 << 20
+
+func registerAdminCloudDownloadRoutes(admin *gin.RouterGroup, svc *service.Container) {
+	admin.GET("/cloud-downloads", listCloudDownloadsHandler(svc))
+	admin.POST("/cloud-downloads", createCloudDownloadsHandler(svc))
+	admin.POST("/cloud-downloads/torrent", uploadCloudDownloadTorrentHandler(svc))
+	admin.GET("/cloud-downloads/quota", cloudDownloadQuotaHandler(svc))
+	admin.POST("/cloud-downloads/:id/retry", retryCloudDownloadHandler(svc))
+	admin.POST("/cloud-downloads/:id/retry-pipeline", retryCloudDownloadPipelineHandler(svc))
+	admin.POST("/cloud-downloads/:id/cancel", cancelCloudDownloadHandler(svc))
+	admin.DELETE("/cloud-downloads/:id", deleteCloudDownloadHandler(svc))
+	admin.POST("/cloud-downloads/clear-finished", clearFinishedCloudDownloadsHandler(svc))
+}
+
+func listCloudDownloadsHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		page, _ := strconv.Atoi(c.Query("page"))
+		pageSize, _ := strconv.Atoi(c.Query("page_size"))
+		res, err := svc.CloudDownload.List(c.Request.Context(), repository.CloudDownloadQuery{
+			Status:     c.Query("status"),
+			SyncPathID: c.Query("sync_path_id"),
+			AccountID:  c.Query("account_id"),
+			Page:       page,
+			PageSize:   pageSize,
+		})
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusOK, res)
+	}
+}
+
+func createCloudDownloadsHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		var req service.CloudDownloadSubmit
+		if err := c.ShouldBindJSON(&req); err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		// 逐条结果里已经包含失败原因，因此部分失败仍返回 200，前端按 items 展示。
+		res, err := svc.CloudDownload.Submit(c.Request.Context(), req)
+		if err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusOK, res)
+	}
+}
+
+func uploadCloudDownloadTorrentHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, cloudDownloadUploadHardLimit)
+		fileHeader, err := c.FormFile("file")
+		if err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "缺少种子文件（form 字段名 file）：" + err.Error()})
+			return
+		}
+		f, err := fileHeader.Open()
+		if err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "打开种子文件失败：" + err.Error()})
+			return
+		}
+		defer func() { _ = f.Close() }()
+		data, err := io.ReadAll(f)
+		if err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "读取种子文件失败：" + err.Error()})
+			return
+		}
+		res, err := svc.CloudDownload.SubmitTorrent(c.Request.Context(), service.CloudDownloadTorrentRequest{
+			AccountID:  c.PostForm("account_id"),
+			SyncPathID: c.PostForm("sync_path_id"),
+			FileName:   fileHeader.Filename,
+			Data:       data,
+		})
+		if err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusOK, res)
+	}
+}
+
+func cloudDownloadQuotaHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		quota, err := svc.CloudDownload.Quota(c.Request.Context(), c.Query("account_id"))
+		if err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusOK, quota)
+	}
+}
+
+func retryCloudDownloadHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if err := svc.CloudDownload.Retry(c.Request.Context(), c.Param("id")); err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusOK, gin.H{"ok": true})
+	}
+}
+
+func retryCloudDownloadPipelineHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if err := svc.CloudDownload.RetryPipeline(c.Request.Context(), c.Param("id")); err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusOK, gin.H{"ok": true})
+	}
+}
+
+func cancelCloudDownloadHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if err := svc.CloudDownload.Cancel(c.Request.Context(), c.Param("id")); err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusOK, gin.H{"ok": true})
+	}
+}
+
+func deleteCloudDownloadHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if err := svc.CloudDownload.Delete(c.Request.Context(), c.Param("id")); err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusOK, gin.H{"ok": true})
+	}
+}
+
+func clearFinishedCloudDownloadsHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		n, err := svc.CloudDownload.ClearFinished(c.Request.Context())
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusOK, gin.H{"deleted": n})
+	}
+}
@@ -0,0 +1,113 @@
+package handler
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"net/http"
+	"testing"
+
+	"github.com/truewhile/MeBox/internal/model"
+)
+
+// 客户端刷新首页时会用 IncludeItemTypes=Movie,Series,Video 一次取「最新」行。
+// 电影库必须返回电影，而不是因为请求里带了 Series 就整行判空。
+func TestEmbyItemsMixedTypesKeepsMoviesInMovieLibrary(t *testing.T) {
+	router, svc, _ := newEmbyDiscoveryEnv(t)
+	if err := svc.Repo.DB.AutoMigrate(&model.Series{}, &model.PlayProfile{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	libID := seedEmbyLibrary(t, svc, "movie")
+	if err := svc.Repo.DB.WithContext(context.Background()).Create(&model.Media{
+		Base:        model.Base{ID: "movie-1"},
+		LibraryID:   libID,
+		Title:       "Movie One",
+		Path:        "/media/movie/one.mp4",
+		Year:        2024,
+		ReleaseDate: "2024-01-01",
+	}).Error; err != nil {
+		t.Fatalf("create movie: %v", err)
+	}
+
+	path := "/emby/Items?ParentId=" + libID +
+		"&IncludeItemTypes=Movie,Series,Video&Recursive=true" +
+		"&SortBy=DateCreated,SortName&SortOrder=Descending&Limit=12&StartIndex=0"
+	w := embyGet(t, router, path, signedTestToken(t, "test-secret"))
+	if w.Code != http.StatusOK {
+		t.Fatalf("unexpected status: %d body=%s", w.Code, w.Body.String())
+	}
+
+	items := decodeItemsEnvelope(t, w.Body.Bytes())
+	if len(items) != 1 {
+		t.Fatalf("expected the movie to be returned, got %d items: %s", len(items), w.Body.String())
+	}
+	if items[0]["Id"] != "movie-1" || items[0]["Type"] != "Movie" {
+		t.Fatalf("unexpected item payload: %#v", items[0])
+	}
+}
+
+// 同一组混合类型在剧集库上仍要折叠成剧集卡片，修复不能把这条路径弄回单集。
+func TestEmbyItemsMixedTypesKeepsSeriesCardsInTvLibrary(t *testing.T) {
+	router, svc, _ := newEmbyDiscoveryEnv(t)
+	if err := svc.Repo.DB.AutoMigrate(&model.Series{}, &model.PlayProfile{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	libID := seedEmbyLibrary(t, svc, "tv")
+	for _, ep := range []struct {
+		id   string
+		num  int
+		path string
+	}{
+		{id: "ep-1", num: 1, path: "/media/tv/show/S01E01.mkv"},
+		{id: "ep-2", num: 2, path: "/media/tv/show/S01E02.mkv"},
+	} {
+		if err := svc.Repo.DB.WithContext(context.Background()).Create(&model.Media{
+			Base:       model.Base{ID: ep.id},
+			LibraryID:  libID,
+			SeriesID:   "series-1",
+			Title:      "Show",
+			Path:       ep.path,
+			SeasonNum:  1,
+			EpisodeNum: ep.num,
+			Year:       2024,
+		}).Error; err != nil {
+			t.Fatalf("create episode: %v", err)
+		}
+	}
+
+	path := "/emby/Items?ParentId=" + libID +
+		"&IncludeItemTypes=Movie,Series,Video&Recursive=true" +
+		"&SortBy=DateCreated,SortName&SortOrder=Descending&Limit=12&StartIndex=0"
+	w := embyGet(t, router, path, signedTestToken(t, "test-secret"))
+	if w.Code != http.StatusOK {
+		t.Fatalf("unexpected status: %d body=%s", w.Code, w.Body.String())
+	}
+
+	items := decodeItemsEnvelope(t, w.Body.Bytes())
+	if len(items) != 1 {
+		t.Fatalf("expected one series card, got %d items: %s", len(items), w.Body.String())
+	}
+	if items[0]["Type"] != "Series" {
+		t.Fatalf("expected Series card, got %#v", items[0])
+	}
+}
+
+// Emby 的 SpecialFeatures 响应是 BaseItemDto[]，客户端按 List 强转；
+// 返回 {"Items":[]} 会直接抛 type cast 异常。
+func TestEmbySpecialFeaturesReturnsBareArray(t *testing.T) {
+	router, _, _ := newEmbyDiscoveryEnv(t)
+	w := embyGet(t, router, "/emby/Items/movie-1/SpecialFeatures", signedTestToken(t, "test-secret"))
+	if w.Code != http.StatusOK {
+		t.Fatalf("unexpected status: %d body=%s", w.Code, w.Body.String())
+	}
+	if trimmed := bytes.TrimSpace(w.Body.Bytes()); len(trimmed) == 0 || trimmed[0] != '[' {
+		t.Fatalf("SpecialFeatures must be a JSON array, got %s", w.Body.String())
+	}
+	var items []any
+	if err := json.Unmarshal(w.Body.Bytes(), &items); err != nil {
+		t.Fatalf("decode array: %v body=%s", err, w.Body.String())
+	}
+	if len(items) != 0 {
+		t.Fatalf("expected empty array, got %d entries", len(items))
+	}
+}
@@ -50,6 +50,25 @@ func embyServeImage(c *gin.Context, svc *service.Container, id, imageType, tag s
 		embyServePlaceholderImage(c)
 		return
 	}
+	// 媒体库主图：按 Emby 的做法，用库内几张成员海报拼一张封面（folder
+	// image）。没有自定义封面时才生成；自定义封面继续走下面的代理路径。
+	if svc.ImageProxy != nil && strings.EqualFold(strings.TrimSpace(imageType), "Primary") {
+		if sources, lib := service.LibraryCoverSourcesForLibrary(ctx, svc.Repo, id); lib != nil &&
+			strings.TrimSpace(lib.CoverURL) == "" && len(sources) > 0 {
+			width, height := libraryCoverRequestSize(c)
+			if data, err := svc.ImageProxy.LibraryCoverImage(ctx, id, sources, width, height); err == nil && len(data) > 0 {
+				c.Header("Cache-Control", "public, max-age=300, stale-while-revalidate=86400")
+				c.Header("Content-Type", "image/jpeg")
+				c.Header("Content-Length", strconv.Itoa(len(data)))
+				if c.Request.Method == http.MethodHead {
+					c.Status(http.StatusOK)
+					return
+				}
+				c.Data(http.StatusOK, "image/jpeg", data)
+				return
+			}
+		}
+	}
 	// PersonImageURL handles TMDb/remote people first and falls back to regular
 	// media/library artwork, so the official /Items/{personId}/Images route
 	// works for synthetic person IDs as well as normal item IDs.
@@ -86,6 +86,12 @@ func embySegmentItems(m *model.Media, rows []model.MediaSegment, want map[string
 		}
 		endMs := row.EndMs
 		if endMs <= 0 {
+			// 只有片尾类允许「延续到片尾」。片头/回顾的结束点缺失意味着这段区间
+			// 本身不可信（数据源用 0 表示「这段不存在」），补成片长会让客户端把
+			// 整集标成片头，所以直接丢弃。
+			if row.Kind != model.SegmentKindCredits && row.Kind != model.SegmentKindPreview {
+				continue
+			}
 			if durationMs <= 0 {
 				continue
 			}
@@ -418,7 +418,11 @@ func embyVideoHLSPlaylistHandler(svc *service.Container) gin.HandlerFunc {
 			c.Status(http.StatusNotFound)
 			return
 		}
-		err = svc.Stream.ServeHLSPlaylist(c.Writer, c.Request, c.Param("id"))
+		scope, ok := localHLSPlaybackScope(c)
+		if !ok {
+			return
+		}
+		err = svc.Stream.ServeHLSPlaylist(c.Writer, c.Request, c.Param("id"), scope)
 		if errors.Is(err, service.ErrTranscodeDisabled) {
 			c.JSON(http.StatusConflict, gin.H{"error": "transcode disabled"})
 			return
@@ -444,7 +448,11 @@ func embyVideoHLSSegmentHandler(svc *service.Container) gin.HandlerFunc {
 			c.Status(http.StatusNotFound)
 			return
 		}
-		if err := svc.Stream.ServeHLSSegment(c.Writer, c.Request, c.Param("id"), c.Param("seg")); err != nil {
+		scope, ok := localHLSPlaybackScope(c)
+		if !ok {
+			return
+		}
+		if err := svc.Stream.ServeHLSSegment(c.Writer, c.Request, c.Param("id"), c.Param("seg"), scope); err != nil {
 			c.Status(http.StatusNotFound)
 		}
 	}
@@ -212,9 +212,11 @@ func registerEmbyAuthenticatedItemRoutes(auth *gin.RouterGroup, svc *service.Con
 	auth.GET("/Items/:id/Similar", embySimilarHandler(svc))
 	auth.GET("/Items/:id/ThumbnailSet", embyEmptyItemsHandler(svc))
 	auth.GET("/Items/:id/ThemeMedia", embyThemeMediaHandler(svc))
-	auth.GET("/Users/:userId/Items/:id/SpecialFeatures", embyEmptyItemsHandler(svc))
+	// SpecialFeatures 在 Emby 官方 schema 里是 BaseItemDto[]（裸数组），
+	// 返回 {"Items":[]} 会让按 List 强转的客户端抛 type cast 异常。
+	auth.GET("/Users/:userId/Items/:id/SpecialFeatures", embyEmptyArrayHandler(svc))
 	auth.GET("/Users/:userId/Items/:id/Intros", embyEmptyItemsHandler(svc))
-	auth.GET("/Items/:id/SpecialFeatures", embyEmptyItemsHandler(svc))
+	auth.GET("/Items/:id/SpecialFeatures", embyEmptyArrayHandler(svc))
 	auth.GET("/Items/:id/Intros", embyEmptyItemsHandler(svc))
 	auth.GET("/api/danmu/:id/raw", embyDanmuRawHandler(svc))
 }
@@ -55,9 +55,9 @@ func registerLowercaseEmbyItemRoutes(auth *gin.RouterGroup, svc *service.Contain
 	auth.GET("/items/:id/similar", embySimilarHandler(svc))
 	auth.GET("/items/:id/thumbnailset", embyEmptyItemsHandler(svc))
 	auth.GET("/items/:id/thememedia", embyThemeMediaHandler(svc))
-	auth.GET("/users/:userId/items/:id/specialfeatures", embyEmptyItemsHandler(svc))
+	auth.GET("/users/:userId/items/:id/specialfeatures", embyEmptyArrayHandler(svc))
 	auth.GET("/users/:userId/items/:id/intros", embyEmptyItemsHandler(svc))
-	auth.GET("/items/:id/specialfeatures", embyEmptyItemsHandler(svc))
+	auth.GET("/items/:id/specialfeatures", embyEmptyArrayHandler(svc))
 	auth.GET("/items/:id/intros", embyEmptyItemsHandler(svc))
 }

@@ -0,0 +1,37 @@
+package handler
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/middleware"
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+func TestStopHLSChecksMediaVisibility(t *testing.T) {
+	router, svc, secret := newPlaybackScopeTestRouter(t)
+	svc.Transcoder = service.NewTranscoderService(svc.Cfg, zap.NewNop(), svc.Repo, nil)
+	router.DELETE("/api/hls/:id", middleware.AuthRequired(secret), stopTranscodeHandler(svc))
+	req := httptest.NewRequest(http.MethodDelete, "/api/hls/nonexistent?session_id=player-a", nil)
+	req.Header.Set("Authorization", "Bearer "+signedTestToken(t, secret))
+	rec := httptest.NewRecorder()
+	router.ServeHTTP(rec, req)
+	if rec.Code != http.StatusNotFound {
+		t.Fatalf("stop of a nonexistent/invisible media: status=%d body=%s, want 404", rec.Code, rec.Body.String())
+	}
+	profile := &model.PlayProfile{UserID: "user-1", Name: "restricted", IsDefault: true, AllowedLibraryIDs: `["other-library"]`}
+	if err := svc.Repo.DB.Create(profile).Error; err != nil {
+		t.Fatal(err)
+	}
+	req = httptest.NewRequest(http.MethodDelete, "/api/hls/media-1?session_id=player-a", nil)
+	req.Header.Set("Authorization", "Bearer "+signedTestToken(t, secret))
+	rec = httptest.NewRecorder()
+	router.ServeHTTP(rec, req)
+	if rec.Code != http.StatusNotFound {
+		t.Fatalf("invisible existing media can be stopped: %d %s", rec.Code, rec.Body.String())
+	}
+}
@@ -0,0 +1,100 @@
+package handler
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+// libraryCoverHandler 输出媒体库封面图（Emby 风格的成员海报拼图）。
+//
+// 之前 Web 端是拿两张成员海报在前端用 CSS 拼格子，Emby 客户端则直接拿一张
+// 评分最高的海报，结果同一个库在不同客户端长得完全不一样。现在服务端生成
+// 一张 16:9 的拼图（Emby 的 folder image 做法），Emby 客户端、Web 和 App
+// 都指向这一份，外观统一。
+func libraryCoverHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		id := strings.TrimSpace(c.Param("id"))
+		if id == "" || svc == nil || svc.ImageProxy == nil {
+			c.JSON(http.StatusNotFound, gin.H{"error": "cover unavailable"})
+			return
+		}
+		ctx, cancel := context.WithTimeout(c.Request.Context(), 25*time.Second)
+		defer cancel()
+
+		sources, lib := service.LibraryCoverSourcesForLibrary(ctx, svc.Repo, id)
+		if lib == nil {
+			c.JSON(http.StatusNotFound, gin.H{"error": "library not found"})
+			return
+		}
+		if strings.TrimSpace(lib.CoverURL) != "" {
+			// 管理员自定义封面优先，保持既有行为（代理该地址）。
+			if err := svc.ImageProxy.Serve(ctx, c.Writer, c.Request, lib.CoverURL); err != nil {
+				c.JSON(http.StatusNotFound, gin.H{"error": "custom cover unavailable"})
+			}
+			return
+		}
+		if len(sources) == 0 {
+			c.JSON(http.StatusNotFound, gin.H{"error": "no library items with artwork"})
+			return
+		}
+		width, height := libraryCoverRequestSize(c)
+		data, err := svc.ImageProxy.LibraryCoverImage(ctx, id, sources, width, height)
+		if err != nil || len(data) == 0 {
+			c.JSON(http.StatusNotFound, gin.H{"error": "cover generation failed"})
+			return
+		}
+		writeLibraryCoverImage(c, data, http.StatusOK)
+	}
+}
+
+// libraryCoverRequestSize 解析请求的封面尺寸：Web 用 w/h，Emby 用
+// maxWidth/maxHeight，两种都兼容。服务端统一输出 16:9 画布（与该库在 Emby
+// 里上报的 PrimaryImageAspectRatio 一致），客户端传的尺寸只当作「不超过」的
+// 边界使用。
+func libraryCoverRequestSize(c *gin.Context) (int, int) {
+	return firstPositiveQueryIntParam(c, "maxWidth", "maxwidth", "width", "w"),
+		firstPositiveQueryIntParam(c, "maxHeight", "maxheight", "height", "h")
+}
+
+func firstPositiveQueryIntParam(c *gin.Context, names ...string) int {
+	for _, name := range names {
+		raw := strings.TrimSpace(c.Query(name))
+		if raw == "" {
+			continue
+		}
+		if n, err := strconv.Atoi(raw); err == nil && n > 0 {
+			return n
+		}
+		if f, err := strconv.ParseFloat(raw, 64); err == nil && f > 0 {
+			return int(f)
+		}
+	}
+	return 0
+}
+
+func writeLibraryCoverImage(c *gin.Context, data []byte, status int) {
+	sum := sha256.Sum256(data)
+	etag := `"` + hex.EncodeToString(sum[:8]) + `"`
+	c.Header("ETag", etag)
+	c.Header("Cache-Control", "public, max-age=300, stale-while-revalidate=86400")
+	if match := strings.TrimSpace(c.GetHeader("If-None-Match")); match != "" && match == etag {
+		c.Status(http.StatusNotModified)
+		return
+	}
+	c.Header("Content-Type", "image/jpeg")
+	c.Header("Content-Length", strconv.Itoa(len(data)))
+	if c.Request.Method == http.MethodHead {
+		c.Status(status)
+		return
+	}
+	c.Data(status, "image/jpeg", data)
+}
@@ -0,0 +1,118 @@
+package handler
+
+import (
+	"bytes"
+	"image/color"
+	"image/jpeg"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+	"github.com/glebarez/sqlite"
+	"go.uber.org/zap"
+	"gorm.io/gorm"
+
+	"github.com/truewhile/MeBox/internal/config"
+	"github.com/truewhile/MeBox/internal/middleware"
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+func coverTestToken(t *testing.T, secret, userID string) string {
+	t.Helper()
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, middleware.Claims{
+		UserID: userID,
+		Role:   "admin",
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Hour)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+			Subject:   userID,
+		},
+	})
+	signed, err := token.SignedString([]byte(secret))
+	if err != nil {
+		t.Fatalf("sign token: %v", err)
+	}
+	return signed
+}
+
+// TestLibraryCoverRouteServesImageThroughFullRouter 走完整的 handler.Register
+// 路由表请求封面：既验证路由挂载正确，也验证鉴权链（AuthRequired +
+// activeUserRequired）不会把它挡成 404。
+func TestLibraryCoverRouteServesImageThroughFullRouter(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	const secret = "test-secret"
+
+	poster := coverTestJPEG(t, color.RGBA{R: 200, G: 120, B: 60, A: 255})
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "image/jpeg")
+		_, _ = w.Write(poster)
+	}))
+	defer upstream.Close()
+	parsed, _ := url.Parse(upstream.URL)
+
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open db: %v", err)
+	}
+	if err := db.AutoMigrate(&model.Library{}, &model.Media{}, &model.User{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	repos := repository.New(db)
+	user := model.User{Base: model.Base{ID: "user-1"}, Username: "viewer", IsActive: true}
+	if err := db.Create(&user).Error; err != nil {
+		t.Fatalf("create user: %v", err)
+	}
+	lib := model.Library{Name: "电影", Path: "/media/movies", Type: "movie", Enabled: true}
+	if err := repos.Library.Create(t.Context(), &lib); err != nil {
+		t.Fatalf("create library: %v", err)
+	}
+	for i := 0; i < 4; i++ {
+		row := model.Media{
+			Base:      model.Base{ID: "m" + string(rune('a'+i))},
+			LibraryID: lib.ID,
+			Title:     "Movie " + string(rune('A'+i)),
+			Path:      "/media/movies/m" + string(rune('a'+i)) + ".mkv",
+			PosterURL: upstream.URL + "/p" + string(rune('1'+i)) + ".jpg",
+		}
+		if err := db.Create(&row).Error; err != nil {
+			t.Fatalf("create media: %v", err)
+		}
+	}
+
+	cfg := &config.Config{
+		Cache:   config.CacheConfig{CacheDir: filepath.Join(t.TempDir(), "cache")},
+		Secrets: config.SecretsConfig{JWTSecret: secret},
+	}
+	proxy := service.NewImageProxy(cfg, zap.NewNop())
+	proxy.SetAllowedRemoteHostsProvider(func() []string { return []string{parsed.Host} })
+	svc := &service.Container{Repo: repos, ImageProxy: proxy}
+
+	engine := gin.New()
+	Register(engine, cfg, zap.NewNop(), svc)
+
+	token := coverTestToken(t, secret, user.ID)
+	req := httptest.NewRequest(http.MethodGet, "/api/libraries/"+lib.ID+"/cover?w=480&h=270&api_key="+token, nil)
+	w := httptest.NewRecorder()
+	engine.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status = %d body=%s", w.Code, w.Body.String())
+	}
+	if ct := w.Header().Get("Content-Type"); ct != "image/jpeg" {
+		t.Fatalf("content type = %q, want image/jpeg", ct)
+	}
+	img, err := jpeg.Decode(bytes.NewReader(w.Body.Bytes()))
+	if err != nil {
+		t.Fatalf("decode cover: %v", err)
+	}
+	if img.Bounds().Dx() != 480 || img.Bounds().Dy() != 270 {
+		t.Fatalf("cover size = %v, want 480x270", img.Bounds())
+	}
+}
@@ -0,0 +1,228 @@
+package handler
+
+import (
+	"bytes"
+	"image"
+	"image/color"
+	"image/jpeg"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"path/filepath"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/glebarez/sqlite"
+	"go.uber.org/zap"
+	"gorm.io/gorm"
+
+	"github.com/truewhile/MeBox/internal/config"
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+func coverTestJPEG(t *testing.T, c color.RGBA) []byte {
+	t.Helper()
+	img := image.NewRGBA(image.Rect(0, 0, 160, 240))
+	for y := 0; y < 240; y++ {
+		for x := 0; x < 160; x++ {
+			img.Set(x, y, c)
+		}
+	}
+	var buf bytes.Buffer
+	if err := jpeg.Encode(&buf, img, &jpeg.Options{Quality: 90}); err != nil {
+		t.Fatalf("encode jpeg: %v", err)
+	}
+	return buf.Bytes()
+}
+
+// newLibraryCoverTestRouter 构造一个带真实图片代理的路由：成员海报来自
+// 本地 httptest 服务，走的是与生产一致的 ImageProxy 抓取路径。
+func newLibraryCoverTestRouter(t *testing.T) (*gin.Engine, *repository.Container, *httptest.Server) {
+	t.Helper()
+	gin.SetMode(gin.TestMode)
+
+	poster := coverTestJPEG(t, color.RGBA{R: 200, G: 120, B: 60, A: 255})
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "image/jpeg")
+		_, _ = w.Write(poster)
+	}))
+	t.Cleanup(upstream.Close)
+
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open db: %v", err)
+	}
+	if err := db.AutoMigrate(&model.Library{}, &model.Media{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	repos := repository.New(db)
+
+	parsed, err := url.Parse(upstream.URL)
+	if err != nil {
+		t.Fatalf("parse upstream: %v", err)
+	}
+	cfg := &config.Config{Cache: config.CacheConfig{CacheDir: filepath.Join(t.TempDir(), "cache")}}
+	proxy := service.NewImageProxy(cfg, zap.NewNop())
+	proxy.SetAllowedRemoteHostsProvider(func() []string { return []string{parsed.Host} })
+
+	svc := &service.Container{Repo: repos, ImageProxy: proxy}
+	router := gin.New()
+	router.GET("/libraries/:id/cover", libraryCoverHandler(svc))
+	router.HEAD("/libraries/:id/cover", libraryCoverHandler(svc))
+	return router, repos, upstream
+}
+
+func seedCoverLibrary(t *testing.T, repos *repository.Container, posterBase string, coverURL string) model.Library {
+	t.Helper()
+	lib := model.Library{Name: "电影", Path: "/media/movies", Type: "movie", Enabled: true, CoverURL: coverURL}
+	if err := repos.Library.Create(t.Context(), &lib); err != nil {
+		t.Fatalf("create library: %v", err)
+	}
+	for i := 0; i < 4; i++ {
+		row := model.Media{
+			Base:      model.Base{ID: "m" + string(rune('a'+i))},
+			LibraryID: lib.ID,
+			Title:     "Movie " + string(rune('A'+i)),
+			Path:      "/media/movies/m" + string(rune('a'+i)) + ".mkv",
+			PosterURL: posterBase + "/p" + string(rune('1'+i)) + ".jpg",
+		}
+		if err := repos.DB.Create(&row).Error; err != nil {
+			t.Fatalf("create media: %v", err)
+		}
+	}
+	return lib
+}
+
+// TestLibraryCoverHandlerServesGeneratedCollage 覆盖 Web/App 的封面接口：
+// 返回的是服务端拼好的 16:9 图片，而不是单张成员海报。
+func TestLibraryCoverHandlerServesGeneratedCollage(t *testing.T) {
+	router, repos, upstream := newLibraryCoverTestRouter(t)
+	lib := seedCoverLibrary(t, repos, upstream.URL, "")
+
+	req := httptest.NewRequest(http.MethodGet, "/libraries/"+lib.ID+"/cover?w=480&h=270", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status = %d body=%s", w.Code, w.Body.String())
+	}
+	if ct := w.Header().Get("Content-Type"); ct != "image/jpeg" {
+		t.Fatalf("content type = %q, want image/jpeg", ct)
+	}
+	img, err := jpeg.Decode(bytes.NewReader(w.Body.Bytes()))
+	if err != nil {
+		t.Fatalf("decode cover: %v", err)
+	}
+	if img.Bounds().Dx() != 480 || img.Bounds().Dy() != 270 {
+		t.Fatalf("cover size = %v, want 480x270", img.Bounds())
+	}
+	if etag := w.Header().Get("ETag"); etag == "" {
+		t.Fatal("expected an ETag so clients can revalidate")
+	}
+
+	// 条件请求应拿到 304。
+	req = httptest.NewRequest(http.MethodGet, "/libraries/"+lib.ID+"/cover?w=480&h=270", nil)
+	req.Header.Set("If-None-Match", w.Header().Get("ETag"))
+	rec := httptest.NewRecorder()
+	router.ServeHTTP(rec, req)
+	if rec.Code != http.StatusNotModified {
+		t.Fatalf("conditional request status = %d, want 304", rec.Code)
+	}
+}
+
+func TestLibraryCoverHandlerUnknownLibraryReturns404(t *testing.T) {
+	router, _, _ := newLibraryCoverTestRouter(t)
+	req := httptest.NewRequest(http.MethodGet, "/libraries/missing/cover", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	if w.Code != http.StatusNotFound {
+		t.Fatalf("status = %d, want 404", w.Code)
+	}
+}
+
+// TestLibraryCoverHandlerServesCustomCover 管理员填了 cover_url 时必须继续
+// 用自定义封面，不能在不知不觉中换成拼图。
+func TestLibraryCoverHandlerServesCustomCover(t *testing.T) {
+	router, repos, upstream := newLibraryCoverTestRouter(t)
+	lib := seedCoverLibrary(t, repos, upstream.URL, upstream.URL+"/custom.jpg")
+
+	req := httptest.NewRequest(http.MethodGet, "/libraries/"+lib.ID+"/cover", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status = %d body=%s", w.Code, w.Body.String())
+	}
+	if _, err := jpeg.Decode(bytes.NewReader(w.Body.Bytes())); err != nil {
+		t.Fatalf("custom cover should be an image: %v", err)
+	}
+}
+
+// TestEmbyLibraryPrimaryUsesGeneratedCollage 保证 Emby 客户端请求库主图时
+// 拿到的也是拼图（与 Web/App 同一份生成逻辑）。
+func TestEmbyLibraryPrimaryUsesGeneratedCollage(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open db: %v", err)
+	}
+	if err := db.AutoMigrate(&model.Library{}, &model.Media{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+
+	poster := coverTestJPEG(t, color.RGBA{G: 180, R: 90, B: 60, A: 255})
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "image/jpeg")
+		_, _ = w.Write(poster)
+	}))
+	defer upstream.Close()
+	parsed, _ := url.Parse(upstream.URL)
+
+	repos := repository.New(db)
+	lib := model.Library{Name: "剧集", Path: "/media/tv", Type: "tv", Enabled: true}
+	if err := repos.Library.Create(t.Context(), &lib); err != nil {
+		t.Fatalf("create library: %v", err)
+	}
+	for i := 0; i < 4; i++ {
+		row := model.Media{
+			Base:      model.Base{ID: "e" + string(rune('a'+i))},
+			LibraryID: lib.ID,
+			Title:     "Show " + string(rune('A'+i)),
+			Path:      "/media/tv/show" + string(rune('a'+i)) + "/S01E01.mkv",
+			SeasonNum: 1, EpisodeNum: 1,
+			PosterURL: upstream.URL + "/p" + string(rune('1'+i)) + ".jpg",
+		}
+		if err := repos.DB.Create(&row).Error; err != nil {
+			t.Fatalf("create media: %v", err)
+		}
+	}
+
+	cfg := &config.Config{Cache: config.CacheConfig{CacheDir: filepath.Join(t.TempDir(), "cache")}}
+	proxy := service.NewImageProxy(cfg, zap.NewNop())
+	proxy.SetAllowedRemoteHostsProvider(func() []string { return []string{parsed.Host} })
+	svc := &service.Container{
+		Repo:       repos,
+		Emby:       service.NewEmbyService(cfg, zap.NewNop(), repos),
+		ImageProxy: proxy,
+	}
+	router := gin.New()
+	registerEmbyRoutes(router, "test-secret", svc)
+
+	req := httptest.NewRequest(http.MethodGet, "/Items/"+lib.ID+"/Images/Primary?maxWidth=400&maxHeight=300", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status = %d body=%s", w.Code, w.Body.String())
+	}
+	img, err := jpeg.Decode(bytes.NewReader(w.Body.Bytes()))
+	if err != nil {
+		t.Fatalf("decode emby library cover: %v", err)
+	}
+	// 请求的是 400×300 的盒子，拼图按 16:9 装进去 → 400×225。
+	if img.Bounds().Dx() != 400 || img.Bounds().Dy() != 225 {
+		t.Fatalf("cover size = %v, want 400x225 (16:9 inside the requested box)", img.Bounds())
+	}
+}
@@ -4,8 +4,11 @@ package handler
 import (
 	"context"
 	"errors"
+	"fmt"
 	"math"
 	"net/http"
+	"net/url"
+	"sort"
 	"strconv"
 	"strings"
 	"sync"
@@ -38,8 +41,32 @@ type webLibraryPayload struct {
 	RemoteSource string                   `json:"remote_source,omitempty"`
 	Total        int64                    `json:"total,omitempty"`
 	Cards        []service.SeriesCardView `json:"cards,omitempty"`
+	// CoverImageURL 是客户端可直接使用的「有效封面」：管理员自定义的
+	// cover_url 优先，否则指向服务端生成的成员海报拼图接口。Web / App 都
+	// 读这一个字段，避免各自用卡片在前端拼格子、长得还不一样。
+	CoverImageURL string `json:"cover_image_url,omitempty"`
 }

+// effectiveLibraryCoverURL 计算库封面的有效地址。远程挂载库的封面由上游
+// Emby 决定，这里返回空串，调用方继续用卡片拼图兜底。
+func effectiveLibraryCoverURL(lib model.Library, isRemote bool) string {
+	if isRemote {
+		return ""
+	}
+	if raw := strings.TrimSpace(lib.CoverURL); raw != "" {
+		return raw
+	}
+	if strings.TrimSpace(lib.ID) == "" {
+		return ""
+	}
+	return "/api/libraries/" + url.PathEscape(lib.ID) + "/cover"
+}
+
+// remoteLibraryPreviewBudget 限制 /api/libraries?with_preview=1 里远程 Emby
+// 库预览（总条数 + 最新卡片）的总耗时。这些预览只用于首页卡片，值得为它
+// 排队等待的量很小；此前它跟随请求上下文，上游超时会让整页等 15 秒以上。
+var remoteLibraryPreviewBudget = 3 * time.Second
+
 // remoteLibraryItemTypes 远程库内容拉取时按 CollectionType 过滤直属条目，
 // 避免电影库里的合集文件夹(Folder) 漏出为电影卡片。
 func remoteLibraryItemTypes(collectionType string) string {
@@ -117,9 +144,10 @@ func listLibrariesHandler(svc *service.Container) gin.HandlerFunc {
 			}
 			for _, p := range previews {
 				out = append(out, webLibraryPayload{
-					Library: p.Library,
-					Total:   p.Total,
-					Cards:   service.NewSeriesCardViews(p.Cards),
+					Library:       p.Library,
+					Total:         p.Total,
+					Cards:         service.NewSeriesCardViews(p.Cards),
+					CoverImageURL: effectiveLibraryCoverURL(p.Library, false),
 				})
 			}
 		} else {
@@ -138,7 +166,7 @@ func listLibrariesHandler(svc *service.Container) gin.HandlerFunc {
 				if counts != nil {
 					total = counts[l.ID]
 				}
-				out = append(out, webLibraryPayload{Library: l, Total: total})
+				out = append(out, webLibraryPayload{Library: l, Total: total, CoverImageURL: effectiveLibraryCoverURL(l, false)})
 			}
 		}
 		// 精确指定目标库时，如果目标全是本地库，就不必枚举远程挂载。
@@ -176,6 +204,12 @@ func listLibrariesHandler(svc *service.Container) gin.HandlerFunc {
 					remotePayloads[i] = webLibraryPayload{Library: v.Library, IsRemoteEmby: true, RemoteSource: v.AccountName}
 				}
 				if withPreview && len(allowedViews) > 0 {
+					// 远程库预览只是首页卡片上的「最新几条」，绝不能拖住整个
+					// 库列表：上游 Emby 一旦超时，每个远程库都要等满
+					// embyRemoteHTTPTimeout（15s），串起来就是 17–30 秒。
+					// 给整段预览一个总预算，超时就只返回库名，卡片留给下一次刷新。
+					previewCtx, cancelPreview := context.WithTimeout(ctx, remoteLibraryPreviewBudget)
+					defer cancelPreview()
 					const maxRemotePreviewWorkers = 6
 					sem := make(chan struct{}, maxRemotePreviewWorkers)
 					var wg sync.WaitGroup
@@ -187,11 +221,11 @@ func listLibrariesHandler(svc *service.Container) gin.HandlerFunc {
 							select {
 							case sem <- struct{}{}:
 								defer func() { <-sem }()
-							case <-ctx.Done():
+							case <-previewCtx.Done():
 								return
 							}
 							helper.Run(svc.Log, "media.remotePreview", func() {
-								acct := svc.EmbyRemote.AccountByID(ctx, v.AccountID)
+								acct := svc.EmbyRemote.AccountByID(previewCtx, v.AccountID)
 								if acct == nil {
 									return
 								}
@@ -203,10 +237,10 @@ func listLibrariesHandler(svc *service.Container) gin.HandlerFunc {
 									Name:           v.Library.Name,
 								}
 								itemTypes := remoteLibraryItemTypes(v.CollectionType)
-								if _, total, err := svc.EmbyRemote.RemoteLibraryMedia(ctx, tmpMount, acct, v.RemoteID, itemTypes, 0, 1); err == nil {
+								if _, total, err := svc.EmbyRemote.RemoteLibraryMedia(previewCtx, tmpMount, acct, v.RemoteID, itemTypes, 0, 1); err == nil {
 									remotePayloads[i].Total = total
 								}
-								if cards, err := svc.EmbyRemote.RemoteLatestCards(ctx, tmpMount, acct, v.RemoteID, limit); err == nil {
+								if cards, err := svc.EmbyRemote.RemoteLatestCards(previewCtx, tmpMount, acct, v.RemoteID, limit); err == nil {
 									remotePayloads[i].Cards = service.NewSeriesCardViews(cards)
 								}
 							})
@@ -259,9 +293,9 @@ func getLibraryHandler(svc *service.Container) gin.HandlerFunc {
 				c.JSON(http.StatusNotFound, gin.H{"error": "not found"})
 				return
 			}
-			c.JSON(http.StatusOK, webLibraryPayload{Library: libs[0]})
+			c.JSON(http.StatusOK, webLibraryPayload{Library: libs[0], CoverImageURL: effectiveLibraryCoverURL(libs[0], false)})
 		} else {
-			c.JSON(http.StatusOK, webLibraryPayload{Library: *lib})
+			c.JSON(http.StatusOK, webLibraryPayload{Library: *lib, CoverImageURL: effectiveLibraryCoverURL(*lib, false)})
 		}
 	}
 }
@@ -654,6 +688,9 @@ func paginateSlice[T any](items []T, page, size int) []T {
 	if len(items) == 0 {
 		return []T{}
 	}
+	if page-1 > len(items)/size {
+		return []T{}
+	}
 	start := (page - 1) * size
 	if start >= len(items) {
 		return []T{}
@@ -668,127 +705,257 @@ func paginateSlice[T any](items []T, page, size int) []T {
 func searchMediaHandler(svc *service.Container) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		ctx := c.Request.Context()
-		q := c.Query("q")
+		query := strings.TrimSpace(c.Query("q"))
 		visibility := mediaVisibilityForRequest(c, svc)
-		groupVersions := c.DefaultQuery("group_versions", "1") != "0"
-
-		fetchRemote := func(limit int) []model.Media {
-			if svc.EmbyRemote == nil || strings.TrimSpace(q) == "" {
-				return nil
-			}
-			remoteItems, _ := svc.EmbyRemote.RemoteSearchMedia(ctx, q, limit, visibility)
-			return remoteItems
+		filter := service.MediaSearchFilter{
+			LibraryID: strings.TrimSpace(c.Query("library_id")),
+			YearMin:   boundedSearchYear(c.Query("year_min")),
+			YearMax:   boundedSearchYear(c.Query("year_max")),
 		}
-
-		if c.DefaultQuery("group_series", "0") != "0" {
-			localItems, err := svc.Media.SearchMediaVisible(ctx, q, 50000, visibility)
-			if err != nil {
-				c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-				return
+		for _, genre := range c.QueryArray("genre") {
+			if genre = strings.TrimSpace(genre); genre != "" && len(filter.Genres) < 8 {
+				filter.Genres = append(filter.Genres, genre)
 			}
-			remoteItems := fetchRemote(50000)
-			all := service.GroupMediaSeriesItems(append(localItems, remoteItems...))
-
-			if c.Query("page") != "" || c.Query("page_size") != "" {
-				page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-				size, _ := strconv.Atoi(c.DefaultQuery("page_size", "50"))
-				paged := paginateSlice(all, page, size)
-				c.JSON(http.StatusOK, gin.H{
-					"items":     paged,
-					"total":     len(all),
-					"page":      page,
-					"page_size": size,
-				})
-				return
-			}
-
-			limit, _ := strconv.Atoi(c.DefaultQuery("limit", "50"))
-			if limit <= 0 {
-				limit = 50
-			}
-			if len(all) > limit {
-				all = all[:limit]
-			}
-			c.JSON(http.StatusOK, gin.H{"items": all})
-			return
 		}
-
-		if c.Query("page") != "" || c.Query("page_size") != "" {
-			page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-			size, _ := strconv.Atoi(c.DefaultQuery("page_size", "50"))
-			if !groupVersions {
-				localItems, _, err := svc.Media.SearchMediaVisiblePage(ctx, q, 1, 50000, visibility)
-				if err != nil {
-					c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-					return
-				}
-				remoteItems := fetchRemote(size * 2)
-				all := append(localItems, remoteItems...)
-				paged := paginateSlice(all, page, size)
-				c.JSON(http.StatusOK, gin.H{
-					"items":     paged,
-					"total":     len(all),
-					"page":      page,
-					"page_size": size,
-				})
-				return
-			}
-			localItems, err := svc.Media.SearchMediaVisible(ctx, q, 50000, visibility)
-			if err != nil {
-				c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-				return
-			}
-			remoteItems := fetchRemote(size * 2)
-			all := append(localItems, remoteItems...)
-			grouped := service.GroupMediaVersions(all)
-			paged := service.PaginateMediaItems(grouped, page, size)
-			c.JSON(http.StatusOK, gin.H{
-				"items":     paged,
-				"total":     len(grouped),
-				"page":      page,
-				"page_size": size,
-			})
-			return
+		if filter.YearMin > 0 && filter.YearMax > 0 && filter.YearMin > filter.YearMax {
+			filter.YearMin, filter.YearMax = filter.YearMax, filter.YearMin
+		}
+		page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+		if page < 1 {
+			page = 1
+		}
+		size, _ := strconv.Atoi(c.DefaultQuery("page_size", "50"))
+		if size < 1 {
+			size = 50
+		} else if size > 2000 {
+			size = 2000
 		}
-
 		limit, _ := strconv.Atoi(c.DefaultQuery("limit", "50"))
-		if limit <= 0 {
+		if limit < 1 {
 			limit = 50
+		} else if limit > 50000 {
+			limit = 50000
 		}
-		if !groupVersions {
-			localItems, err := svc.Media.SearchMediaVisible(ctx, q, limit, visibility)
-			if err != nil {
-				c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-				return
-			}
-			remoteItems := fetchRemote(limit)
-			all := append(localItems, remoteItems...)
-			if len(all) > limit {
-				all = all[:limit]
-			}
-			if all == nil {
-				all = []model.Media{}
-			}
-			c.JSON(http.StatusOK, gin.H{"items": all})
-			return
-		}
-
-		localItems, err := svc.Media.SearchMediaVisible(ctx, q, 50000, visibility)
+		paginated := c.Query("page") != "" || c.Query("page_size") != ""
+		sortBy := normalizeMediaSearchSort(c.Query("sort"))
+		// 远程搜索与本地查询并行发起：本地结果不再排在远程超时之后才返回。
+		remoteCh := startRemoteMediaSearch(ctx, svc, query, visibility, filter)
+		// Sorting and grouping must operate on the same candidate set before
+		// either a page size or the caller's output limit is applied.
+		items, err := svc.Media.SearchMediaVisibleFiltered(ctx, query, 50000, visibility, filter)
 		if err != nil {
 			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 			return
 		}
-		remoteItems := fetchRemote(limit)
-		all := append(localItems, remoteItems...)
-		grouped := service.GroupMediaVersions(all)
-		items := service.FirstMediaItems(grouped, limit)
-		if items == nil {
-			items = []service.MediaItem{}
+		if remoteCh != nil {
+			for _, item := range <-remoteCh {
+				items = append(items, item)
+			}
 		}
-		c.JSON(http.StatusOK, gin.H{"items": items})
+		if c.DefaultQuery("group_series", "0") != "0" {
+			items = service.GroupMediaSeriesItems(items)
+			sortSearchMedia(items, sortBy)
+			writeMediaSearchResults(c, items, page, size, limit, paginated)
+			return
+		}
+		if c.DefaultQuery("group_versions", "1") != "0" {
+			grouped := service.GroupMediaVersions(items)
+			if sortBy != "" {
+				sort.SliceStable(grouped, func(i, j int) bool {
+					return mediaSearchSortLess(grouped[i].Media, grouped[j].Media, sortBy)
+				})
+			}
+			writeMediaSearchResults(c, grouped, page, size, limit, paginated)
+			return
+		}
+		sortSearchMedia(items, sortBy)
+		writeMediaSearchResults(c, items, page, size, limit, paginated)
 	}
 }

+const (
+	// remoteSearchItemLimit 是每个远程 Emby 挂载点返回的条目上限。此前这里传
+	// 50000（等于让上游做一次全库查询），上游稍慢就会一路跑到 5 秒超时，把每次
+	// 搜索都拖成秒级；搜索场景只需要少量候选，多出来的结果也会被分页丢掉。
+	remoteSearchItemLimit = 100
+	// remoteSearchBudget 限制远程结果最多给一次请求增加多少延迟。
+	remoteSearchBudget = 2 * time.Second
+	// remoteSearchCacheTTL 让同一关键词的翻页与重复搜索复用远程结果，避免每翻
+	// 一页都重新打一遍远程挂载点。
+	remoteSearchCacheTTL = 30 * time.Second
+	// remoteSearchFailureCacheTTL 用于上游超时/失败时的短缓存：部分结果只保留
+	// 几秒，避免反复吃满 remoteSearchBudget，又不至于长期压住后续重试。
+	remoteSearchFailureCacheTTL = 5 * time.Second
+)
+
+// startRemoteMediaSearch 并发发起远程搜索，返回一个只投递一次结果的通道。
+// 不满足远程搜索条件时返回 nil。通道带缓冲，调用方即使提前返回也不会泄漏
+// goroutine；请求结束时请求上下文被取消，远程调用会随之退出。
+func startRemoteMediaSearch(
+	ctx context.Context,
+	svc *service.Container,
+	query string,
+	visibility service.MediaVisibility,
+	filter service.MediaSearchFilter,
+) <-chan []model.Media {
+	if svc == nil || svc.EmbyRemote == nil || query == "" {
+		return nil
+	}
+	if filter.LibraryID != "" && !service.IsEmbyRemoteID(filter.LibraryID) {
+		return nil
+	}
+	results := make(chan []model.Media, 1)
+	go func() {
+		results <- remoteMediaSearchItems(ctx, svc, query, visibility, filter)
+	}()
+	return results
+}
+
+func remoteMediaSearchItems(
+	ctx context.Context,
+	svc *service.Container,
+	query string,
+	visibility service.MediaVisibility,
+	filter service.MediaSearchFilter,
+) []model.Media {
+	cacheKey := remoteSearchCacheKey(query, visibility)
+	if svc.Cache != nil {
+		if cached, ok := svc.Cache.GetObject(cacheKey); ok {
+			if rows, ok := cached.([]model.Media); ok {
+				return filterRemoteSearchItems(rows, filter)
+			}
+		}
+	}
+	searchCtx, cancel := context.WithTimeout(ctx, remoteSearchBudget)
+	defer cancel()
+	remote, _ := svc.EmbyRemote.RemoteSearchMedia(searchCtx, query, remoteSearchItemLimit, visibility)
+	if svc.Cache != nil {
+		// 空结果也要缓存：否则查不到片名时每次都会重新等到 remoteSearchBudget。
+		if remote == nil {
+			remote = []model.Media{}
+		}
+		ttl := remoteSearchCacheTTL
+		if searchCtx.Err() != nil {
+			ttl = remoteSearchFailureCacheTTL
+		}
+		svc.Cache.SetObject(cacheKey, remote, ttl)
+	}
+	return filterRemoteSearchItems(remote, filter)
+}
+
+func filterRemoteSearchItems(remote []model.Media, filter service.MediaSearchFilter) []model.Media {
+	if len(remote) == 0 {
+		return nil
+	}
+	out := make([]model.Media, 0, len(remote))
+	for _, item := range remote {
+		if remoteSearchMatchesFilter(item, filter) {
+			out = append(out, item)
+		}
+	}
+	return out
+}
+
+// remoteSearchCacheKey 按可见范围隔离远程搜索结果，避免把某个用户可见挂载
+// 点的结果复用给可见范围不同的用户。
+func remoteSearchCacheKey(query string, visibility service.MediaVisibility) string {
+	allowed := append([]string(nil), visibility.AllowedLibraryIDs...)
+	hidden := append([]string(nil), visibility.HiddenLibraryIDs...)
+	sort.Strings(allowed)
+	sort.Strings(hidden)
+	return fmt.Sprintf("media:obj:remote-search:%t|%s|%s|%s",
+		visibility.IncludeNSFW, strings.Join(allowed, ","), strings.Join(hidden, ","), query)
+}
+
+func writeMediaSearchResults[T any](c *gin.Context, items []T, page, size, limit int, paginated bool) {
+	if items == nil {
+		items = []T{}
+	}
+	if paginated {
+		c.JSON(http.StatusOK, gin.H{
+			"items": paginateSlice(items, page, size),
+			"total": len(items), "page": page, "page_size": size,
+		})
+		return
+	}
+	if len(items) > limit {
+		items = items[:limit]
+	}
+	c.JSON(http.StatusOK, gin.H{"items": items})
+}
+
+func remoteSearchMatchesFilter(item model.Media, filter service.MediaSearchFilter) bool {
+	if filter.LibraryID != "" && item.LibraryID != filter.LibraryID && item.DisplayLibraryID != filter.LibraryID {
+		return false
+	}
+	if filter.YearMin > 0 && item.Year < filter.YearMin || filter.YearMax > 0 && item.Year > filter.YearMax {
+		return false
+	}
+	if len(filter.Genres) == 0 {
+		return true
+	}
+	normalize := func(value string) string {
+		return strings.ToLower(strings.ReplaceAll(strings.TrimSpace(value), " ", ""))
+	}
+	for _, genre := range strings.Split(strings.ReplaceAll(item.Genres, "，", ","), ",") {
+		for _, wanted := range filter.Genres {
+			if normalize(genre) == normalize(wanted) {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func normalizeMediaSearchSort(value string) string {
+	value = strings.TrimSpace(value)
+	switch value {
+	case "title_asc", "year_desc", "rating_desc":
+		return value
+	default:
+		return ""
+	}
+}
+
+func sortSearchMedia(items []model.Media, sortBy string) {
+	if sortBy == "" {
+		return
+	}
+	sort.SliceStable(items, func(i, j int) bool {
+		return mediaSearchSortLess(items[i], items[j], sortBy)
+	})
+}
+
+func mediaSearchSortLess(a, b model.Media, sortBy string) bool {
+	switch sortBy {
+	case "title_asc":
+		left, right := strings.ToLower(strings.TrimSpace(a.Title)), strings.ToLower(strings.TrimSpace(b.Title))
+		if left != right {
+			return left < right
+		}
+	case "year_desc":
+		if a.Year != b.Year {
+			return a.Year > b.Year
+		}
+	case "rating_desc":
+		if a.Rating != b.Rating {
+			return a.Rating > b.Rating
+		}
+	}
+	if !a.CreatedAt.Equal(b.CreatedAt) {
+		return a.CreatedAt.After(b.CreatedAt)
+	}
+	return a.ID < b.ID
+}
+
+func boundedSearchYear(value string) int {
+	year, err := strconv.Atoi(strings.TrimSpace(value))
+	if err != nil || year < 1870 || year > 2200 {
+		return 0
+	}
+	return year
+}
+
 func streamHandler(svc *service.Container) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		ctx := c.Request.Context()
@@ -0,0 +1,136 @@
+package handler
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/glebarez/sqlite"
+	"go.uber.org/zap"
+	"gorm.io/gorm"
+
+	"github.com/truewhile/MeBox/internal/config"
+	"github.com/truewhile/MeBox/internal/middleware"
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+// TestListLibrariesRemotePreviewIsBounded 锁定远程库预览的总预算：
+// 上游 Emby 卡住时，/api/libraries?with_preview=1 必须按时返回远程库条目
+// （只是没有卡片），而不是跟着上游一起等十几秒。线上实测这个接口因此出现过
+// 17.4 秒、30 秒（前端放弃）的响应，设置页也跟着整页空转。
+func TestListLibrariesRemotePreviewIsBounded(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	oldBudget := remoteLibraryPreviewBudget
+	remoteLibraryPreviewBudget = 200 * time.Millisecond
+	t.Cleanup(func() { remoteLibraryPreviewBudget = oldBudget })
+
+	// Views / 用户列表正常返回，Preview（Items 查询）永远不返回：模拟上游半挂。
+	release := make(chan struct{})
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		path := r.URL.Path
+		switch {
+		case strings.HasSuffix(path, "/Views"):
+			_ = json.NewEncoder(w).Encode(map[string]any{
+				"Items": []map[string]any{{
+					"Id": "view-1", "Name": "远程动画", "CollectionType": "tvshows",
+				}},
+			})
+			return
+		case strings.HasSuffix(path, "/Users"):
+			// api_key 账号要先解析出远程用户 Id，否则请求路径会落到兜底 "0"。
+			_ = json.NewEncoder(w).Encode([]map[string]any{{"Id": "uid-1", "Name": "admin"}})
+			return
+		case r.Method == http.MethodPost:
+			_ = json.NewEncoder(w).Encode(map[string]any{
+				"AccessToken": "fake-token",
+				"User":        map[string]any{"Id": "uid-1"},
+			})
+			return
+		}
+		select {
+		case <-release:
+		case <-r.Context().Done():
+		case <-time.After(30 * time.Second):
+		}
+		w.WriteHeader(http.StatusGatewayTimeout)
+	}))
+	defer upstream.Close()
+	defer close(release)
+
+	// 唯一库名 + cache=shared：预览协程会并发读库（账号解析）。
+	dsn := fmt.Sprintf("file:%s?mode=memory&cache=shared", strings.ReplaceAll(t.Name(), "/", "_"))
+	db, err := gorm.Open(sqlite.Open(dsn), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.AutoMigrate(&model.Library{}, &model.Media{}, &model.StrmAccount{}, &model.EmbyMount{}, &model.Setting{}, &model.User{}, &model.PlayProfile{}); err != nil {
+		t.Fatal(err)
+	}
+	repos := repository.New(db)
+	if err := db.Create(&model.User{Base: model.Base{ID: "admin-1"}, Username: "admin", Role: "admin"}).Error; err != nil {
+		t.Fatal(err)
+	}
+	rawConfig, _ := json.Marshal(map[string]string{"url": upstream.URL, "token": "fake-token"})
+	acct := model.StrmAccount{
+		Base: model.Base{ID: "acct-1"}, Name: "远程Emby", Provider: model.StrmProviderEmbyRemote,
+		Config: string(rawConfig), Enabled: true,
+	}
+	if err := repos.StrmAccount.Create(t.Context(), &acct); err != nil {
+		t.Fatal(err)
+	}
+	mount := model.EmbyMount{
+		Base: model.Base{ID: "mount-1"}, AccountID: acct.ID, RemoteViewID: "view-1",
+		RemoteViewName: "远程动画", CollectionType: "tvshows", Enabled: true,
+	}
+	if err := repos.EmbyMount.Create(t.Context(), &mount); err != nil {
+		t.Fatal(err)
+	}
+	svc := &service.Container{
+		Repo:       repos,
+		Media:      service.NewMediaService(&config.Config{}, zap.NewNop(), repos),
+		EmbyRemote: service.NewEmbyRemoteService(&config.Config{}, zap.NewNop(), repos, service.NewCryptoService("", zap.NewNop())),
+		Cache:      service.NewRuntimeCacheService(&config.Config{}, zap.NewNop()),
+	}
+
+	w := httptest.NewRecorder()
+	c, _ := gin.CreateTestContext(w)
+	c.Set(middleware.CtxUserID, "admin-1")
+	c.Set(middleware.CtxUserRole, "admin")
+	c.Request = httptest.NewRequest(http.MethodGet, "/api/libraries?with_preview=1&include_hidden=1", nil)
+
+	start := time.Now()
+	listLibrariesHandler(svc)(c)
+	elapsed := time.Since(start)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status=%d body=%s", w.Code, w.Body.String())
+	}
+	if elapsed > 2*time.Second {
+		t.Fatalf("request took %v with a hung upstream; the preview budget must bound it", elapsed)
+	}
+	var payload []webLibraryPayload
+	if err := json.Unmarshal(w.Body.Bytes(), &payload); err != nil {
+		t.Fatalf("decode response: %v (%s)", err, w.Body.String())
+	}
+	var remote *webLibraryPayload
+	for i := range payload {
+		if payload[i].IsRemoteEmby {
+			remote = &payload[i]
+			break
+		}
+	}
+	if remote == nil {
+		t.Fatalf("remote library missing from the bounded response: %#v", payload)
+	}
+	if len(remote.Cards) != 0 || remote.Total != 0 {
+		t.Fatalf("expected the preview to be skipped on timeout, got total=%d cards=%d", remote.Total, len(remote.Cards))
+	}
+}
@@ -0,0 +1,37 @@
+package handler
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+func mediaQualityHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+		pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "50"))
+		if page < 1 {
+			page = 1
+		} else if page > 1000000 {
+			page = 1000000
+		}
+		if pageSize < 1 {
+			pageSize = 50
+		} else if pageSize > 100 {
+			pageSize = 100
+		}
+		issue := c.DefaultQuery("issue", "unmatched")
+		if issue != "unmatched" && issue != "poster" && issue != "missing" {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "未知检查分类"})
+			return
+		}
+		items, total, err := svc.Media.QualityIssues(c.Request.Context(), issue, page, pageSize)
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusOK, gin.H{"items": items, "total": total, "page": page, "page_size": pageSize})
+	}
+}
@@ -0,0 +1,88 @@
+package handler
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strconv"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/glebarez/sqlite"
+	"go.uber.org/zap"
+	"gorm.io/gorm"
+
+	"github.com/truewhile/MeBox/internal/config"
+	"github.com/truewhile/MeBox/internal/middleware"
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+func TestSearchMediaSortLimitFiltersAndDeepPagination(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	sqlDB, _ := db.DB()
+	defer sqlDB.Close()
+	if err := db.AutoMigrate(&model.Library{}, &model.Media{}, &model.User{}, &model.Setting{}, &model.PlayProfile{}); err != nil {
+		t.Fatal(err)
+	}
+	repos := repository.New(db)
+	lib := model.Library{Name: "Review", Path: "/review", Type: "movie", Enabled: true}
+	if err := repos.Library.Create(t.Context(), &lib); err != nil {
+		t.Fatal(err)
+	}
+	rows := make([]model.Media, 2001)
+	for i := range rows {
+		rows[i] = model.Media{
+			Base: model.Base{ID: fmt.Sprintf("review-%04d", i)}, LibraryID: lib.ID,
+			Title: fmt.Sprintf("Review %04d", i), Path: fmt.Sprintf("/review/%04d.mp4", i), Year: 2020, Genres: "Comedy",
+		}
+	}
+	rows[2000].Year = 2025
+	rows[2000].Genres = "Drama"
+	if err := db.CreateInBatches(rows, 100).Error; err != nil {
+		t.Fatal(err)
+	}
+	svc := &service.Container{Repo: repos, Media: service.NewMediaService(&config.Config{}, zap.NewNop(), repos)}
+	cases := []struct {
+		name, query, expectedID  string
+		count, total, page, size int
+	}{
+		{name: "sorted output limit", query: "sort=year_desc&limit=1", expectedID: "review-2000", count: 1},
+		{name: "page past old 2000 cap", query: "sort=title_asc&page=2001&page_size=1", expectedID: "review-2000", count: 1, total: 2001, page: 2001, size: 1},
+		{name: "genre filtering", query: "genre=Drama&library_id=" + lib.ID, expectedID: "review-2000", count: 1},
+		{name: "normalized page", query: "page=0&page_size=0", count: 50, total: 2001, page: 1, size: 50},
+		{name: "bounded page size", query: "page=1&page_size=99999", count: 2000, total: 2001, page: 1, size: 2000},
+		{name: "huge page does not overflow", query: "page=" + strconv.Itoa(int(^uint(0)>>1)) + "&page_size=2000", count: 0, total: 2001, page: int(^uint(0) >> 1), size: 2000},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			w := httptest.NewRecorder()
+			ctx, _ := gin.CreateTestContext(w)
+			ctx.Set(middleware.CtxUserID, "admin")
+			ctx.Set(middleware.CtxUserRole, "admin")
+			ctx.Request = httptest.NewRequest(http.MethodGet, "/api/media?q=Review&group_versions=0&"+tc.query, nil)
+			searchMediaHandler(svc)(ctx)
+			var response struct {
+				Items []model.Media `json:"items"`
+				Total int           `json:"total"`
+				Page  int           `json:"page"`
+				Size  int           `json:"page_size"`
+			}
+			if w.Code != http.StatusOK || json.Unmarshal(w.Body.Bytes(), &response) != nil {
+				t.Fatalf("search failed: status=%d body=%s", w.Code, w.Body.String())
+			}
+			if len(response.Items) != tc.count || response.Total != tc.total || response.Page != tc.page || response.Size != tc.size {
+				t.Fatalf("response count=%d total=%d page=%d size=%d, want %#v", len(response.Items), response.Total, response.Page, response.Size, tc)
+			}
+			if tc.expectedID != "" && response.Items[0].ID != tc.expectedID {
+				t.Fatalf("first ID=%q want %q", response.Items[0].ID, tc.expectedID)
+			}
+		})
+	}
+}
@@ -0,0 +1,153 @@
+package handler
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/glebarez/sqlite"
+	"go.uber.org/zap"
+	"gorm.io/gorm"
+
+	"github.com/truewhile/MeBox/internal/config"
+	"github.com/truewhile/MeBox/internal/middleware"
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+// TestSearchMediaRemoteSearchBoundedAndCached 防止远程搜索再次退化：
+// 1. 每个挂载点的 Limit 必须是 remoteSearchItemLimit，而不是历史全库查询的 50000；
+// 2. 同一关键词的重复搜索应命中缓存，不再打上游；
+// 3. 指定本地媒体库时不应枚举远程挂载点。
+func TestSearchMediaRemoteSearchBoundedAndCached(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+
+	var mu sync.Mutex
+	searchCalls := 0
+	searchLimits := make([]string, 0, 4)
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if term := r.URL.Query().Get("SearchTerm"); term != "" {
+			mu.Lock()
+			searchCalls++
+			searchLimits = append(searchLimits, r.URL.Query().Get("Limit"))
+			mu.Unlock()
+		}
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(map[string]any{
+			"TotalRecordCount": 1,
+			"Items": []map[string]any{{
+				"Id":             "remote-1",
+				"Name":           "远方剧集",
+				"Type":           "Series",
+				"ProductionYear": 2024,
+			}},
+		})
+	}))
+	defer upstream.Close()
+
+	// 唯一库名 + cache=shared：远程搜索与本地查询会并发读库，
+	// 而 :memory: 下每个连接各自一个空库，并发连接会读到「no such table」。
+	dsn := fmt.Sprintf("file:%s?mode=memory&cache=shared", strings.ReplaceAll(t.Name(), "/", "_"))
+	db, err := gorm.Open(sqlite.Open(dsn), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.AutoMigrate(&model.Library{}, &model.Media{}, &model.StrmAccount{}, &model.EmbyMount{}, &model.Setting{}, &model.User{}, &model.PlayProfile{}); err != nil {
+		t.Fatal(err)
+	}
+	repos := repository.New(db)
+	if err := repos.DB.Create(&model.User{Base: model.Base{ID: "user-1"}, Username: "admin", Role: "admin"}).Error; err != nil {
+		t.Fatal(err)
+	}
+	lib := model.Library{Name: "本地电影", Path: "/media/movies", Type: "movie", Enabled: true}
+	if err := repos.Library.Create(t.Context(), &lib); err != nil {
+		t.Fatal(err)
+	}
+	if err := db.Create(&model.Media{
+		Base: model.Base{ID: "local-1"}, LibraryID: lib.ID, Title: "流浪地球", Path: "/media/movies/流浪地球.mkv",
+	}).Error; err != nil {
+		t.Fatal(err)
+	}
+	rawConfig, _ := json.Marshal(map[string]string{"url": upstream.URL, "token": "fake-token"})
+	acct := model.StrmAccount{
+		Base: model.Base{ID: "acct"}, Name: "远程Emby", Provider: model.StrmProviderEmbyRemote,
+		Config: string(rawConfig), Enabled: true,
+	}
+	if err := repos.StrmAccount.Create(t.Context(), &acct); err != nil {
+		t.Fatal(err)
+	}
+	mount := model.EmbyMount{
+		Base: model.Base{ID: "mount-1"}, AccountID: acct.ID, RemoteViewID: "view-1",
+		RemoteViewName: "远程剧集", CollectionType: "tvshows", Enabled: true,
+	}
+	if err := repos.EmbyMount.Create(t.Context(), &mount); err != nil {
+		t.Fatal(err)
+	}
+
+	svc := &service.Container{
+		Repo:       repos,
+		Media:      service.NewMediaService(&config.Config{}, zap.NewNop(), repos),
+		EmbyRemote: service.NewEmbyRemoteService(&config.Config{}, zap.NewNop(), repos, service.NewCryptoService("", zap.NewNop())),
+		Cache:      service.NewRuntimeCacheService(&config.Config{}, zap.NewNop()),
+	}
+
+	search := func(params string) []service.MediaItem {
+		t.Helper()
+		w := httptest.NewRecorder()
+		c, _ := gin.CreateTestContext(w)
+		c.Set(middleware.CtxUserID, "user-1")
+		c.Set(middleware.CtxUserRole, "admin")
+		c.Request = httptest.NewRequest(http.MethodGet, "/api/media?"+params, nil)
+		searchMediaHandler(svc)(c)
+		if w.Code != http.StatusOK {
+			t.Fatalf("search status=%d, body=%s", w.Code, w.Body.String())
+		}
+		var response struct {
+			Items []service.MediaItem `json:"items"`
+		}
+		if err := json.Unmarshal(w.Body.Bytes(), &response); err != nil {
+			t.Fatal(err)
+		}
+		return response.Items
+	}
+	callCount := func() int {
+		mu.Lock()
+		defer mu.Unlock()
+		return searchCalls
+	}
+
+	if items := search("q=远方&page=1&page_size=48"); len(items) != 1 || items[0].Title != "远方剧集" {
+		t.Fatalf("expected remote result, got %#v", items)
+	}
+	if calls := callCount(); calls != 1 {
+		t.Fatalf("expected exactly one upstream search, got %d", calls)
+	}
+	mu.Lock()
+	limit := searchLimits[0]
+	mu.Unlock()
+	if limit != "100" {
+		t.Fatalf("remote search Limit=%q, want bounded 100 (50000 means a full-library query)", limit)
+	}
+
+	// 同一关键词再来一次（例如刷新/重复搜索）应复用缓存，不再请求上游。
+	if items := search("q=远方&page=1&page_size=48"); len(items) != 1 || items[0].Title != "远方剧集" {
+		t.Fatalf("cached search lost the remote result: %#v", items)
+	}
+	if calls := callCount(); calls != 1 {
+		t.Fatalf("expected cached remote search to skip upstream, got %d calls", calls)
+	}
+
+	// 指定本地媒体库时不应枚举远程挂载点。
+	if items := search("q=流浪&page=1&page_size=48&library_id=" + lib.ID); len(items) != 1 || items[0].ID != "local-1" {
+		t.Fatalf("expected local-only result, got %#v", items)
+	}
+	if calls := callCount(); calls != 1 {
+		t.Fatalf("local library filter must not hit upstream, got %d calls", calls)
+	}
+}
@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"net/http"
 	"net/http/httptest"
+	"net/url"
+	"strings"
 	"testing"

 	"github.com/gin-gonic/gin"
@@ -27,13 +29,17 @@ func TestSearchMediaSeriesKeepsRemoteLibrariesSeparate(t *testing.T) {
 			"TotalRecordCount": 1,
 			"Items": []map[string]any{{
 				"Id": "same-series", "Name": "龙珠改", "Type": "Series",
-				"ProviderIds": map[string]string{"Tmdb": "61709"},
+				"ProviderIds":    map[string]string{"Tmdb": "61709"},
+				"ProductionYear": 2024, "Genres": []string{"Science Fiction"},
 			}},
 		})
 	}))
 	defer upstream.Close()

-	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	// 唯一库名 + cache=shared：远程搜索与本地查询会并发读库，
+	// 而 :memory: 下每个连接各自一个空库，并发连接会读到「no such table」。
+	dsn := fmt.Sprintf("file:%s?mode=memory&cache=shared", strings.ReplaceAll(t.Name(), "/", "_"))
+	db, err := gorm.Open(sqlite.Open(dsn), &gorm.Config{})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -108,4 +114,9 @@ func TestSearchMediaSeriesKeepsRemoteLibrariesSeparate(t *testing.T) {
 		}
 		seen[item.DisplayLibraryID] = true
 	}
+	remoteLibraryID := service.EncodeEmbyRemoteID("mount-a", "view-a")
+	items, total := request("page=1&page_size=8&library_id=" + url.QueryEscape(remoteLibraryID) + "&year_min=2020&genre=Science+Fiction")
+	if total != 1 || len(items) != 1 || items[0].DisplayLibraryID != remoteLibraryID {
+		t.Fatalf("remote library/year/genre filters lost results: total=%d items=%#v", total, items)
+	}
 }
@@ -559,7 +559,10 @@ func TestSearchMediaHandlerIncludesEmbyRemote(t *testing.T) {
 	}))
 	defer server.Close()

-	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	// 唯一库名 + cache=shared：远程搜索与本地查询会并发读库，
+	// 而 :memory: 下每个连接各自一个空库，并发连接会读到「no such table」。
+	dsn := fmt.Sprintf("file:%s?mode=memory&cache=shared", strings.ReplaceAll(t.Name(), "/", "_"))
+	db, err := gorm.Open(sqlite.Open(dsn), &gorm.Config{})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1,13 +1,18 @@
 // Package handler — 片头/片尾片段接口。
 //
-//	GET /playback/:id/segments
+//	GET    /playback/:id/segments
+//	PUT    /playback/:id/segments   {kind, position_ms, clear}
 //
 // 单独开一个接口而不是塞进 /media/:id/playback，有两个原因：一是抓取外部数据
 // 可能要几秒，不能拖慢决定能否起播的那个请求；二是片段与播放来源（本地 / 云盘 /
 // 远程 Emby）无关，独立出来对所有媒体一致。
+//
+// 写入接口只处理「手动标记」：用户播放时把当前位置标成片头结束 / 片尾开始。
+// 外部数据永远由提供方刷新，不接受客户端写入。
 package handler

 import (
+	"errors"
 	"net/http"

 	"github.com/gin-gonic/gin"
@@ -42,6 +47,72 @@ func playbackSegmentsHandler(svc *service.Container) gin.HandlerFunc {
 	}
 }

+// playbackSegmentsMarkRequest 是手动标记的入参。
+type playbackSegmentsMarkRequest struct {
+	// Kind 只接受 intro / credits。
+	Kind string `json:"kind" binding:"required"`
+	// PositionMs 是当前播放位置：标片头时表示片头结束点，标片尾时表示片尾开始点。
+	PositionMs int64 `json:"position_ms"`
+	// Clear 为 true 时删除该类型的标记。
+	Clear bool `json:"clear"`
+}
+
+// playbackSegmentsMarkHandler 写入或清除一条手动标记，返回更新后的完整片段列表。
+//
+// 返回整份列表而不是只回 204：播放器需要立刻反映合并后的结果（手动标记优先级
+// 最高），避免自己再发一次 GET 造成竞态。
+func playbackSegmentsMarkHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if svc.Segments == nil {
+			c.JSON(http.StatusServiceUnavailable, gin.H{"error": "segments unavailable"})
+			return
+		}
+		m, err := findMediaForPlaybackEndpoint(c, svc, c.Param("id"))
+		if err != nil || m == nil || !mediaVisibleForRequest(c, svc, m) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "media not found"})
+			return
+		}
+		// 远程 Emby 挂载是上游库的投影，本地标记没有可落地的地方。
+		if service.IsEmbyRemoteID(m.ID) {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "remote media cannot be marked"})
+			return
+		}
+		var req playbackSegmentsMarkRequest
+		if err := c.ShouldBindJSON(&req); err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "invalid body"})
+			return
+		}
+		err = svc.Segments.SetManualMark(c.Request.Context(), m, service.ManualMarkRequest{
+			Kind:       req.Kind,
+			PositionMs: req.PositionMs,
+			Clear:      req.Clear,
+		})
+		if errors.Is(err, service.ErrInvalidManualMark) {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "invalid skip mark"})
+			return
+		}
+		if err != nil {
+			if svc.Log != nil {
+				svc.Log.Warn("save manual skip mark failed",
+					zap.String("media_id", m.ID), zap.Error(err))
+			}
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "save failed"})
+			return
+		}
+		rows, listErr := svc.Segments.ListForPlayback(c.Request.Context(), m)
+		if listErr != nil {
+			if svc.Log != nil {
+				svc.Log.Debug("list media segments after mark failed",
+					zap.String("media_id", m.ID), zap.Error(listErr))
+			}
+		}
+		c.JSON(http.StatusOK, gin.H{
+			"segments":  service.ToSegmentViews(rows),
+			"auto_skip": resolveAutoSkipFlag(c, svc),
+		})
+	}
+}
+
 // resolveAutoSkipFlag reads the「自动跳过片头」switch off whichever profile is
 // currently in effect. It reuses selectedPlayProfile so the server agrees with
 // the UI about which profile is active (explicit header first, then the user's
@@ -0,0 +1,406 @@
+package handler
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"strconv"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/service"
+	"github.com/truewhile/MeBox/internal/service/reader"
+)
+
+// 音轨「区间直通」的行为契约。
+//
+// 背景（真实故障）：播放器（media3）取一条 m4a 会开两次请求——先整段打开嗅探
+// 容器，再带 Range 从目标位置重开。旧实现只允许「无 Range + 无分片」的请求
+// 边下边发，于是带 Range 的那次（真正的起播请求）必须把整章下完再按区间下发。
+// 线上日志：每章固定 200（探针，被播放器掐断）+ 206（整章下完才吐第一个字节），
+// 42 章里「媒体已装载 → 实际起播」平均 4.79 秒，最坏 35 秒。
+//
+// 现在的契约：
+//   - 带 Range 的冷缓存请求 → 上游一到字节就往下发，不等整章；
+//   - 分片已有的前缀从本地发，上游只续下剩余字节；
+//   - 整章落满时把分片提升为正式缓存，之后走本地；
+//   - 上游不认 Range 时也要给出正确的 206（跳过前缀），且不写带洞的分片；
+//   - 拿不到写锁时降级成纯透传，绝不排队等前一个下载。
+
+// rangeUpstream 支持 Range 的上游：/content 给出音轨地址，/media 回音频本体。
+type rangeUpstream struct {
+	*httptest.Server
+	payload    []byte
+	honorRange bool
+	// firstChunk > 0 且 release 非 nil 时：先写这么多字节再等放行，
+	// 用来证明「客户端不必等整章下完」。
+	firstChunk int
+	release    chan struct{}
+
+	mu     sync.Mutex
+	ranges []string
+	hits   int
+}
+
+func newRangeUpstream(t *testing.T, payload []byte, honorRange bool) *rangeUpstream {
+	t.Helper()
+	u := &rangeUpstream{payload: payload, honorRange: honorRange}
+	u.Server = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch {
+		case strings.HasPrefix(r.URL.Path, "/book/1"):
+			w.Header().Set("Content-Type", "text/html; charset=utf-8")
+			_, _ = w.Write([]byte(`<html><body><h1>区间之书</h1></body></html>`))
+		case r.URL.Path == "/content":
+			w.Header().Set("Content-Type", "application/json; charset=utf-8")
+			_, _ = w.Write([]byte(fmt.Sprintf(`{"data":{"url":"%s/media"}}`, u.URL)))
+		case r.URL.Path == "/media":
+			u.serveMedia(w, r)
+		default:
+			http.NotFound(w, r)
+		}
+	}))
+	t.Cleanup(u.Close)
+	return u
+}
+
+func (u *rangeUpstream) serveMedia(w http.ResponseWriter, r *http.Request) {
+	u.mu.Lock()
+	u.hits++
+	u.ranges = append(u.ranges, r.Header.Get("Range"))
+	u.mu.Unlock()
+
+	total := len(u.payload)
+	start, end := 0, total-1
+	partial := false
+	if u.honorRange {
+		if s, e, ok := parseReaderAudioRange(r.Header.Get("Range")); ok {
+			start = int(s)
+			if e >= 0 && int(e) < end {
+				end = int(e)
+			}
+			partial = true
+		}
+	}
+	w.Header().Set("Content-Type", "audio/mp4")
+	w.Header().Set("Accept-Ranges", "bytes")
+	if start >= total {
+		w.WriteHeader(http.StatusRequestedRangeNotSatisfiable)
+		return
+	}
+	body := u.payload[start : end+1]
+	w.Header().Set("Content-Length", strconv.Itoa(len(body)))
+	if partial {
+		w.Header().Set("Content-Range", fmt.Sprintf("bytes %d-%d/%d", start, end, total))
+		w.WriteHeader(http.StatusPartialContent)
+	} else {
+		w.WriteHeader(http.StatusOK)
+	}
+	if u.release != nil && u.firstChunk > 0 && len(body) > u.firstChunk {
+		_, _ = w.Write(body[:u.firstChunk])
+		if flusher, ok := w.(http.Flusher); ok {
+			flusher.Flush()
+		}
+		select {
+		case <-u.release:
+		case <-r.Context().Done():
+			return
+		}
+		body = body[u.firstChunk:]
+	}
+	_, _ = w.Write(body)
+}
+
+func (u *rangeUpstream) rangeHeaders() []string {
+	u.mu.Lock()
+	defer u.mu.Unlock()
+	return append([]string(nil), u.ranges...)
+}
+
+func (u *rangeUpstream) requestCount() int {
+	u.mu.Lock()
+	defer u.mu.Unlock()
+	return u.hits
+}
+
+// prepareRangeBook 建一本「书源直连上游」的音频书，并取回该音轨的签名代理路径。
+func prepareRangeBook(t *testing.T, upstream string) (*service.Container, *model.ReaderBook, string) {
+	t.Helper()
+	svc := newReaderHandlerContainer(t)
+	svc.Cfg.Cache.CacheDir = t.TempDir()
+	srcJSON := fmt.Sprintf(`{
+  "bookSourceName": "区间直通测试",
+  "bookSourceType": 1,
+  "bookSourceUrl": %q,
+  "ruleContent": {"content": "$.data.url"}
+}`, upstream)
+	if _, err := svc.Reader.ImportSources(t.Context(), "u1", srcJSON); err != nil {
+		t.Fatalf("导入书源失败: %v", err)
+	}
+	srcs, err := svc.Reader.ListSources(t.Context(), "u1")
+	if err != nil || len(srcs) == 0 {
+		t.Fatalf("读不到书源: %v", err)
+	}
+	book, err := svc.Reader.AddBook(t.Context(), "u1", reader.SearchOrigin{
+		SourceID:   srcs[0].ID,
+		Origin:     upstream,
+		OriginName: "区间直通测试",
+		OriginType: 1,
+		BookURL:    upstream + "/book/1",
+	}, "区间之书", "某作者", "")
+	if err != nil {
+		t.Fatalf("加入书架失败: %v", err)
+	}
+	if err := svc.Reader.SaveChapters(t.Context(), book.ID, []reader.ChapterInput{
+		{Index: 0, Title: "第一章", URL: upstream + "/content"},
+	}); err != nil {
+		t.Fatalf("保存目录失败: %v", err)
+	}
+	out, err := svc.Reader.GetContentForBook(t.Context(), "u1", book.ID, 0, reader.ContentOptions{})
+	if err != nil {
+		t.Fatalf("取章节失败: %v", err)
+	}
+	if len(out.Tracks) != 1 {
+		t.Fatalf("音轨数 = %d，期望 1", len(out.Tracks))
+	}
+	return svc, book, out.Tracks[0]
+}
+
+func audioPayload(n int) []byte {
+	payload := make([]byte, n)
+	for i := range payload {
+		payload[i] = byte(i % 251)
+	}
+	return payload
+}
+
+// waitCached 等待分片被提升为正式缓存（提升发生在响应收尾，与客户端读完成之间有微小竞态）。
+func waitCached(t *testing.T, svc *service.Container, bookID, mediaURL string) {
+	t.Helper()
+	deadline := time.Now().Add(3 * time.Second)
+	for time.Now().Before(deadline) {
+		if svc.Reader.HasCachedRemoteAudio(bookID, mediaURL) {
+			return
+		}
+		time.Sleep(20 * time.Millisecond)
+	}
+	t.Fatalf("整章下完后应提升为正式缓存")
+}
+
+// TestReaderAudioRangeStreamsWithoutWaitingForWholeChapter 冷缓存 + Range：
+// 上游只吐了第一段，客户端就必须已经拿到字节。
+func TestReaderAudioRangeStreamsWithoutWaitingForWholeChapter(t *testing.T) {
+	payload := audioPayload(512 << 10)
+	upstream := newRangeUpstream(t, payload, true)
+	upstream.firstChunk = 64 << 10
+	upstream.release = make(chan struct{})
+
+	svc, book, track := prepareRangeBook(t, upstream.URL)
+	mediaURL := upstream.URL + "/media"
+	srv := httptest.NewServer(mediaRouterForTest(svc))
+	defer srv.Close()
+
+	req, err := http.NewRequest(http.MethodGet, srv.URL+track, nil)
+	if err != nil {
+		t.Fatalf("构造请求失败: %v", err)
+	}
+	req.Header.Set("Range", "bytes=0-")
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		t.Fatalf("请求失败: %v", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusPartialContent {
+		t.Fatalf("状态码 = %d，期望 206", resp.StatusCode)
+	}
+	if got := resp.Header.Get("Content-Range"); got != fmt.Sprintf("bytes 0-%d/%d", len(payload)-1, len(payload)) {
+		t.Fatalf("Content-Range = %q", got)
+	}
+	if got := resp.Header.Get("Content-Length"); got != strconv.Itoa(len(payload)) {
+		t.Fatalf("Content-Length = %q，期望 %d", got, len(payload))
+	}
+
+	// 上游此时还被 release 卡着：能在超时内读到第一段就说明没有等整章。
+	head := make([]byte, upstream.firstChunk)
+	readDone := make(chan error, 1)
+	go func() {
+		_, readErr := io.ReadFull(resp.Body, head)
+		readDone <- readErr
+	}()
+	select {
+	case readErr := <-readDone:
+		if readErr != nil {
+			t.Fatalf("读首段失败: %v", readErr)
+		}
+	case <-time.After(3 * time.Second):
+		t.Fatalf("上游还没给完就卡住了：客户端没能在整章下完前拿到第一个字节")
+	}
+	if !bytes.Equal(head, payload[:upstream.firstChunk]) {
+		t.Fatalf("首段字节不一致")
+	}
+
+	close(upstream.release)
+	rest, err := io.ReadAll(resp.Body)
+	if err != nil {
+		t.Fatalf("读剩余字节失败: %v", err)
+	}
+	if got := append(head, rest...); !bytes.Equal(got, payload) {
+		t.Fatalf("整体字节不一致: got %d bytes", len(got))
+	}
+	if got := upstream.rangeHeaders(); len(got) != 1 || got[0] != "bytes=0-" {
+		t.Fatalf("上游收到的 Range = %v，期望且仅一次 bytes=0-", got)
+	}
+	waitCached(t, svc, book.ID, mediaURL)
+}
+
+// TestReaderAudioRangeResumesFromPartialFragment 分片里已有前缀时，前缀从本地发，
+// 上游只续下剩余字节；整章落满后提升为正式缓存。
+func TestReaderAudioRangeResumesFromPartialFragment(t *testing.T) {
+	payload := audioPayload(256 << 10)
+	upstream := newRangeUpstream(t, payload, true)
+	svc, book, track := prepareRangeBook(t, upstream.URL)
+	mediaURL := upstream.URL + "/media"
+
+	// 模拟「播放器嗅探完就断开」留下的分片：前 96KB 已经在盘上。
+	const partLen = 96 << 10
+	cachePath := svc.Reader.RemoteAudioCachePath(book.ID, mediaURL)
+	if cachePath == "" {
+		t.Fatalf("缓存路径为空")
+	}
+	if mkErr := os.MkdirAll(cachePath[:strings.LastIndex(cachePath, string(os.PathSeparator))], 0o750); mkErr != nil {
+		t.Fatalf("建缓存目录失败: %v", mkErr)
+	}
+	if writeErr := os.WriteFile(cachePath+".part", payload[:partLen], 0o640); writeErr != nil {
+		t.Fatalf("写分片失败: %v", writeErr)
+	}
+
+	code, body := getReaderMediaWithRange(t, mediaRouterForTest(svc), track, "bytes=0-")
+	if code != http.StatusPartialContent {
+		t.Fatalf("状态码 = %d，期望 206 body=%.120s", code, body)
+	}
+	if !bytes.Equal([]byte(body), payload) {
+		t.Fatalf("拼接后的字节不一致: got %d bytes want %d", len(body), len(payload))
+	}
+	headers := upstream.rangeHeaders()
+	if len(headers) != 1 || headers[0] != fmt.Sprintf("bytes=%d-", partLen) {
+		t.Fatalf("上游收到的 Range = %v，期望从分片长度续下 bytes=%d-", headers, partLen)
+	}
+	waitCached(t, svc, book.ID, mediaURL)
+
+	// 提升之后同一首歌不再回源。
+	before := upstream.requestCount()
+	code, body = getReaderMedia(t, mediaRouterForTest(svc), track)
+	if code != http.StatusOK || !bytes.Equal([]byte(body), payload) {
+		t.Fatalf("命中缓存失败 status=%d len=%d", code, len(body))
+	}
+	if after := upstream.requestCount(); after != before {
+		t.Fatalf("命中缓存后不应再回源，多了 %d 次", after-before)
+	}
+}
+
+// TestReaderAudioRangeHandlesUpstreamThatIgnoresRange 上游不认 Range（回 200 整段）时，
+// 仍要按客户端要的起点给出正确的 206，并且不写带洞的分片。
+func TestReaderAudioRangeHandlesUpstreamThatIgnoresRange(t *testing.T) {
+	payload := audioPayload(300 << 10)
+	upstream := newRangeUpstream(t, payload, false)
+	svc, book, track := prepareRangeBook(t, upstream.URL)
+	mediaURL := upstream.URL + "/media"
+
+	const start = 1000
+	code, body := getReaderMediaWithRange(t, mediaRouterForTest(svc), track, fmt.Sprintf("bytes=%d-", start))
+	if code != http.StatusPartialContent {
+		t.Fatalf("状态码 = %d，期望 206 body=%.120s", code, body)
+	}
+	if !bytes.Equal([]byte(body), payload[start:]) {
+		t.Fatalf("区间字节不一致: got %d want %d", len(body), len(payload)-start)
+	}
+	// 起点不在分片内 → 不能落盘（否则分片开头会是空洞）。
+	if svc.Reader.HasPartialRemoteAudio(book.ID, mediaURL) {
+		t.Fatalf("起点靠后的区间请求不应生成分片")
+	}
+	if svc.Reader.HasCachedRemoteAudio(book.ID, mediaURL) {
+		t.Fatalf("只下了一段不应生成完整缓存")
+	}
+}
+
+// TestReaderAudioRangeFallsBackToPassthroughWhenWriterBusy 拿不到写锁时不排队：
+// 仍然立刻把区间发出去，只是这一轮不落盘。
+func TestReaderAudioRangeFallsBackToPassthroughWhenWriterBusy(t *testing.T) {
+	payload := audioPayload(128 << 10)
+	upstream := newRangeUpstream(t, payload, true)
+	svc, book, track := prepareRangeBook(t, upstream.URL)
+	mediaURL := upstream.URL + "/media"
+
+	cacheKey := svc.Reader.RemoteAudioCachePath(book.ID, mediaURL)
+	if cacheKey == "" {
+		t.Fatalf("缓存路径为空")
+	}
+	unlock := readerAudioStreamLocks.Lock(cacheKey)
+	defer unlock()
+
+	done := make(chan struct{})
+	var code int
+	var body string
+	go func() {
+		code, body = getReaderMediaWithRange(t, mediaRouterForTest(svc), track, "bytes=0-")
+		close(done)
+	}()
+	select {
+	case <-done:
+	case <-time.After(3 * time.Second):
+		t.Fatalf("写锁被占用时不该让请求排队等待")
+	}
+	if code != http.StatusPartialContent {
+		t.Fatalf("状态码 = %d，期望 206 body=%.120s", code, body)
+	}
+	if !bytes.Equal([]byte(body), payload) {
+		t.Fatalf("区间字节不一致: got %d want %d", len(body), len(payload))
+	}
+	if svc.Reader.HasCachedRemoteAudio(book.ID, mediaURL) {
+		t.Fatalf("降级透传不应写缓存")
+	}
+}
+
+func TestParseReaderAudioRangeCases(t *testing.T) {
+	cases := []struct {
+		in        string
+		start     int64
+		end       int64
+		want      bool
+	}{
+		{"bytes=0-", 0, -1, true},
+		{"bytes=100-199", 100, 199, true},
+		{"Bytes=1024-", 1024, -1, true},
+		{" bytes=5-5 ", 5, 5, true},
+		{"bytes=-500", 0, 0, false},
+		{"bytes=0-99,200-299", 0, 0, false},
+		{"items=0-", 0, 0, false},
+		{"bytes=abc-", 0, 0, false},
+		{"bytes=200-100", 0, 0, false},
+		{"", 0, 0, false},
+	}
+	for _, c := range cases {
+		start, end, ok := parseReaderAudioRange(c.in)
+		if ok != c.want || start != c.start || end != c.end {
+			t.Errorf("parseReaderAudioRange(%q) = (%d,%d,%v)，期望 (%d,%d,%v)",
+				c.in, start, end, ok, c.start, c.end, c.want)
+		}
+	}
+}
+
+// getReaderMediaWithRange 发一次带 Range 头的媒体代理请求。
+func getReaderMediaWithRange(t *testing.T, router *gin.Engine, signedPath, rangeHeader string) (int, string) {
+	t.Helper()
+	w := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodGet, signedPath, nil)
+	req.Header.Set("Range", rangeHeader)
+	router.ServeHTTP(w, req)
+	return w.Code, w.Body.String()
+}
@@ -0,0 +1,38 @@
+package handler
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/truewhile/MeBox/internal/service/reader"
+)
+
+func TestReaderContentOptions(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	for _, tc := range []struct {
+		query string
+		want  reader.ContentOptions
+	}{
+		{"", reader.ContentOptions{}},
+		{"?media=direct", reader.ContentOptions{MediaDirect: true}},
+		{"?media=proxy", reader.ContentOptions{ForceProxy: true}},
+		{"?audio=native", reader.ContentOptions{NativeAudio: true}},
+		{"?audio=native&media=direct", reader.ContentOptions{NativeAudio: true, MediaDirect: true}},
+		{"?audio=native&media=proxy", reader.ContentOptions{NativeAudio: true, ForceProxy: true}},
+		{"?audio=%20NaTiVe%20&media=%20DiReCt%20", reader.ContentOptions{NativeAudio: true, MediaDirect: true}},
+		{"?audio=native&media=unknown", reader.ContentOptions{NativeAudio: true}},
+		{"?audio=browser&media=proxy", reader.ContentOptions{ForceProxy: true}},
+		{"?audio=unknown&media=direct", reader.ContentOptions{MediaDirect: true}},
+	} {
+		t.Run(tc.query, func(t *testing.T) {
+			c, _ := gin.CreateTestContext(httptest.NewRecorder())
+			c.Request = httptest.NewRequest(http.MethodGet, "/api/reader/books/book/content"+tc.query, nil)
+			if got := readerContentOptions(c); got != tc.want {
+				t.Fatalf("options = %+v, want %+v", got, tc.want)
+			}
+		})
+	}
+}
@@ -0,0 +1,764 @@
+package handler
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/service"
+	"github.com/truewhile/MeBox/internal/service/reader"
+)
+
+// 媒体代理在「上游签名票被拒」时的行为契约。
+//
+// 背景（真实故障）：聆阅·懒人听书源的音频直链是第三方中转现签的腾讯 CDN 票，
+// 票被 CDN 判掉时上游回的是**空的 401**（无 Content-Type、无 body）。旧行为把它
+// 原样透传给播放器，播放器重试的还是同一个 URL，于是 App 日志里连续 4~8 个
+// ERROR_CODE_IO_BAD_HTTP_STATUS (2004)，表现为「这本书怎么都播不了」。
+//
+// 现在的契约：
+//   - 能换票 → 用新票重拉，直接返回媒体本体（第一个请求就被治好）；
+//   - 换不到 → 502 + 明确文案，而不是把 401 丢给播放器；
+//   - 非音轨地址（漫画图片防盗链等）→ 维持原样透传，不改变既有行为。
+
+func TestReaderMediaPayloadRejected(t *testing.T) {
+	cases := []struct {
+		name        string
+		head        string
+		contentType string
+		want        bool
+	}{
+		{"HTML 错误页", "<!DOCTYPE html><html><body>403</body></html>", "text/html; charset=utf-8", true},
+		{"JSON 报错", `{"code":403,"message":"expired"}`, "application/json", true},
+		{"数组形态报错", `[{"error":"bad ticket"}]`, "application/json; charset=utf-8", true},
+		{"纯文本报错", "ticket expired", "text/plain", false},
+		{"正常 m4a", "\x00\x00\x00\x20ftypmp42", "audio/mp4", false},
+		{"正常 mp3", "ID3\x04\x00", "audio/mpeg", false},
+		{"正常图片", "\xff\xd8\xff\xe0", "image/jpeg", false},
+		{"播放列表", "#EXTM3U\n#EXTINF:10,", "application/vnd.apple.mpegurl", false},
+		{"空体", "", "text/html", false},
+		{"HTML 类型但二进制体", "\x00\x00\x00\x20ftypmp42", "text/html", false},
+	}
+	for _, c := range cases {
+		got := readerMediaPayloadRejected([]byte(c.head), c.contentType)
+		if got != c.want {
+			t.Errorf("%s: readerMediaPayloadRejected(%q, %q) = %v，期望 %v",
+				c.name, c.head, c.contentType, got, c.want)
+		}
+	}
+}
+
+// TestReaderMediaProxyHealsStaleTicket 票被上游拒绝时代理自己换票重拉，
+// 第一个请求就返回媒体本体（不必等播放器重试）。
+func TestReaderMediaProxyHealsStaleTicket(t *testing.T) {
+	svc, srv, book := prepareMediaTicketBook(t)
+	router := mediaRouterForTest(svc)
+
+	signed := primeTicketBook(t, svc, book.ID)
+	// 让中转再签一张新票：章节缓存里那张就此变成「旧票」。
+	srv.rotate()
+
+	code, body := getReaderMedia(t, router, signed)
+	if code != http.StatusOK {
+		t.Fatalf("换票重试后 status=%d body=%s", code, body)
+	}
+	if !strings.Contains(body, "fake-audio-bytes") {
+		t.Fatalf("响应体不是媒体: %q", body)
+	}
+	if got := srv.contentHits(); got < 2 {
+		t.Fatalf("应当回源重取章节，实际请求 %d 次", got)
+	}
+}
+
+// TestReaderMediaProxyFailsClearlyWhenRefreshImpossible 换不到票时给 502 + 明确文案，
+// 而不是把 401 透传给播放器（那样播放器只会对着必然失败的地址反复重试）。
+func TestReaderMediaProxyFailsClearlyWhenRefreshImpossible(t *testing.T) {
+	svc, srv, book := prepareMediaTicketBook(t)
+	router := mediaRouterForTest(svc)
+
+	signed := primeTicketBook(t, svc, book.ID)
+	srv.rotate()
+	srv.stopIssuing()
+
+	code, body := getReaderMedia(t, router, signed)
+	if code != http.StatusBadGateway {
+		t.Fatalf("换票失败应当返回 502，实际 %d body=%s", code, body)
+	}
+	if !strings.Contains(body, "签名失效") {
+		t.Fatalf("错误文案应说明是音源签名失效: %s", body)
+	}
+}
+
+// TestReaderMediaProxyStopsResendingRejectedTicket 上游成批拒绝时（连新签的票
+// 也是空 401），不能在播放器那一次请求里把同一张被拒的票打上十几遍：连续两轮
+// 换票都是同一个状态码就立刻失败，把明确文案交出去。
+func TestReaderMediaProxyStopsResendingRejectedTicket(t *testing.T) {
+	svc, srv, book := prepareMediaTicketBook(t)
+	router := mediaRouterForTest(svc)
+
+	signed := primeTicketBook(t, svc, book.ID)
+	srv.denyAlways()
+
+	code, body := getReaderMedia(t, router, signed)
+	if code != http.StatusBadGateway {
+		t.Fatalf("上游持续拒绝应返回 502，实际 %d body=%s", code, body)
+	}
+	if !strings.Contains(body, "401") {
+		t.Fatalf("错误文案应带上上游状态码: %s", body)
+	}
+	// 每轮 fetchReaderMedia = 首拉(401) + 换票后重拉(401)，两轮即收手。
+	if got := srv.mediaRequests(); got > 4 {
+		t.Fatalf("无进展的拒绝应当两轮就收手，实际上游请求 %d 次", got)
+	}
+}
+
+// TestReaderAudioCacheResumesTruncatedUpstream 上游中途 RST 后用 Range 续传：
+// 播放器最终拿到的仍是完整的一章，而不是从头重下。
+func TestReaderAudioCacheResumesTruncatedUpstream(t *testing.T) {
+	const bodyBytes = 300 << 10
+	payload := bytes.Repeat([]byte("m4a!"), bodyBytes/4)
+	var ranges []string
+	var mu sync.Mutex
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		mu.Lock()
+		ranges = append(ranges, r.Header.Get("Range"))
+		count := len(ranges)
+		mu.Unlock()
+
+		w.Header().Set("Content-Type", "audio/mp4")
+		w.Header().Set("Accept-Ranges", "bytes")
+		start := 0
+		if count > 1 {
+			// 第二次起按 Range 续传。
+			start = bodyBytes / 2
+			w.Header().Set("Content-Range", fmt.Sprintf("bytes %d-%d/%d", start, bodyBytes-1, bodyBytes))
+			w.WriteHeader(http.StatusPartialContent)
+		} else {
+			w.Header().Set("Content-Length", strconv.Itoa(bodyBytes))
+		}
+		chunk := payload[start:]
+		if count == 1 {
+			// 第一次只写一半就断开。
+			chunk = payload[:bodyBytes/2]
+		}
+		for written := 0; written < len(chunk); written += 8 << 10 {
+			end := written + 8<<10
+			if end > len(chunk) {
+				end = len(chunk)
+			}
+			if _, err := w.Write(chunk[written:end]); err != nil {
+				return
+			}
+		}
+		w.(http.Flusher).Flush()
+		if count == 1 {
+			if hj, ok := w.(http.Hijacker); ok {
+				if conn, _, err := hj.Hijack(); err == nil {
+					_ = conn.Close()
+				}
+			}
+		}
+	}))
+	defer srv.Close()
+
+	svc, _, book := prepareMediaTicketBookWithUpstream(t, srv.URL)
+	router := mediaRouterForTest(svc)
+	signed := svc.Reader.ProxyURL(book.ID, srv.URL+"/media")
+
+	code, body := getReaderMedia(t, router, signed)
+	if code != http.StatusOK {
+		t.Fatalf("续传后应当成功，实际 status=%d body=%.120s", code, body)
+	}
+	if len(body) != bodyBytes {
+		t.Fatalf("交付字节 = %d，期望 %d", len(body), bodyBytes)
+	}
+	mu.Lock()
+	defer mu.Unlock()
+	if len(ranges) < 2 || ranges[0] != "" {
+		t.Fatalf("请求序列 = %q，期望先整段再续传", ranges)
+	}
+	if !strings.HasPrefix(ranges[1], "bytes=") {
+		t.Fatalf("第二轮应当带 Range，实际 %q", ranges[1])
+	}
+}
+
+// TestReaderMediaProxyPassesThroughNonTrackError 漫画图片这类不可换票的地址，
+// 上游 4xx 仍按原状态透传（既有行为不变）。
+func TestReaderMediaProxyPassesThroughNonTrackError(t *testing.T) {
+	svc, srv, book := prepareMediaTicketBook(t)
+	router := mediaRouterForTest(svc)
+
+	// 书源域名下的图片地址：不在任何音轨缓存里。
+	imgURL := srv.URL + "/img/forbidden.jpg"
+	signed := svc.Reader.ProxyURL(book.ID, imgURL)
+
+	code, body := getReaderMedia(t, router, signed)
+	if code == http.StatusBadGateway || code == http.StatusUnauthorized {
+		t.Fatalf("非音轨地址不该走换票分支，实际 %d body=%s", code, body)
+	}
+	if code != http.StatusForbidden {
+		t.Fatalf("图片 403 应原样透传，实际 %d body=%s", code, body)
+	}
+	if got := srv.contentHits(); got != 0 {
+		t.Fatalf("图片失败不该触发回源取章节，实际 %d 次", got)
+	}
+}
+
+// TestReaderMediaProxyRejectsNonMediaPayload 上游用 200 回一段 HTML/JSON 错误页时，
+// 代理直接判失败，不把网页喂给播放器（否则报「格式不支持」）。
+func TestReaderMediaProxyRejectsNonMediaPayload(t *testing.T) {
+	svc, srv, book := prepareMediaTicketBook(t)
+	router := mediaRouterForTest(svc)
+
+	signed := primeTicketBook(t, svc, book.ID)
+	srv.serveErrorPage()
+
+	code, body := getReaderMedia(t, router, signed)
+	if code != http.StatusBadGateway {
+		t.Fatalf("非媒体内容应当返回 502，实际 %d body=%.160s", code, body)
+	}
+	if !strings.Contains(body, "非媒体内容") {
+		t.Fatalf("错误文案应说明上游返回了非媒体内容: %s", body)
+	}
+}
+
+// ─── 上游抖动：连接被 reset 时的重试与截断可见化 ─────────────────────────
+
+// TestReaderMediaProbeRetriesConnectionReset 上游在响应体中途 RST 连接时，
+// 代理要退避重试，而不是第一次读失败就回 502。
+//
+// 真实故障：腾讯 CDN 的跨境边缘在并发/长传输时会直接 RST，同一章重试一次
+// 往往就好。以前这里读 body 失败即判死，把一次可恢复的抖动变成「这本书播不了」。
+func TestReaderMediaProbeRetriesConnectionReset(t *testing.T) {
+	var attempts int32
+	const bodyBytes = 200 << 10
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		n := atomic.AddInt32(&attempts, 1)
+		if n == 1 {
+			// 第一次：声明长度，写一小段后直接断开连接（模拟 RST/提前 EOF）。
+			w.Header().Set("Content-Type", "audio/mp4")
+			w.Header().Set("Content-Length", strconv.Itoa(bodyBytes))
+			_, _ = w.Write([]byte("\x00\x00\x00\x20ftypmp42"))
+			w.(http.Flusher).Flush()
+			if hj, ok := w.(http.Hijacker); ok {
+				if conn, _, err := hj.Hijack(); err == nil {
+					_ = conn.Close()
+				}
+			}
+			return
+		}
+		w.Header().Set("Content-Type", "audio/mp4")
+		w.Header().Set("Content-Length", strconv.Itoa(bodyBytes))
+		payload := make([]byte, 8<<10)
+		for written := 0; written < bodyBytes; written += len(payload) {
+			if _, err := w.Write(payload); err != nil {
+				return
+			}
+		}
+	}))
+	defer srv.Close()
+
+	svc, _, book := prepareMediaTicketBookWithUpstream(t, srv.URL)
+	router := mediaRouterForTest(svc)
+	signed := svc.Reader.ProxyURL(book.ID, srv.URL+"/media")
+
+	code, body := getReaderMedia(t, router, signed)
+	if code != http.StatusOK {
+		t.Fatalf("连接被 reset 后应当重试成功，实际 status=%d body=%.200s", code, body)
+	}
+	if int32(len(body)) != bodyBytes {
+		t.Fatalf("交付字节 = %d，期望 %d", len(body), bodyBytes)
+	}
+	if got := atomic.LoadInt32(&attempts); got < 2 {
+		t.Fatalf("应当重试过，实际上游请求 %d 次", got)
+	}
+}
+
+// TestReaderMediaAbortsWhenUpstreamTruncates 非音轨的流式透传路径：上游中途
+// 断开且重试都失败时，必须让客户端看到「传输不完整」，不能返回一个长度正确
+// 却内容缺失的响应。
+//
+// 以前这里是 `_, _ = io.Copy(...)`，错误被丢掉，客户端拿到一个正常结束的
+// 半截文件 —— 播放器只能报「格式不支持」（3003），根因被彻底掩盖。
+//
+// 音轨走的是整段落盘缓存（见 TestReaderAudioCacheRejectsTruncatedUpstream）：
+// 拉不完整就重试，全部失败回 502，绝不会把半截音频交给播放器。
+func TestReaderMediaAbortsWhenUpstreamTruncates(t *testing.T) {
+	const declared = 400 << 10
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "audio/mp4")
+		w.Header().Set("Content-Length", strconv.Itoa(declared))
+		// 先写够探测用的前缀，再断开：探测能过，透传阶段才断。
+		payload := make([]byte, 8<<10)
+		for written := 0; written < 128<<10; written += len(payload) {
+			if _, err := w.Write(payload); err != nil {
+				return
+			}
+		}
+		w.(http.Flusher).Flush()
+		if hj, ok := w.(http.Hijacker); ok {
+			if conn, _, err := hj.Hijack(); err == nil {
+				_ = conn.Close()
+			}
+		}
+	}))
+	defer srv.Close()
+
+	svc, _, book := prepareMediaTicketBookWithUpstream(t, srv.URL)
+	router := mediaRouterForTest(svc)
+	// .mp4 不是音频后缀：走流式透传分支（音轨会被整段落盘缓存）。
+	signed := svc.Reader.ProxyURL(book.ID, srv.URL+"/media.mp4")
+
+	w := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodGet, signed, nil)
+	// panic(http.ErrAbortHandler) 由 net/http 捕获；httptest 下会向上冒泡，
+	// 这里断言它确实发生了（即「没有静默地把半截文件当成功」）。
+	defer func() {
+		recovered := recover()
+		if recovered == nil {
+			t.Fatalf("上游截断时必须中止响应（panic(http.ErrAbortHandler)），实际正常返回了 %d 字节",
+				w.Body.Len())
+		}
+		if recovered != http.ErrAbortHandler {
+			t.Fatalf("中止响应时应使用 http.ErrAbortHandler，实际 %v", recovered)
+		}
+	}()
+	router.ServeHTTP(w, req)
+	if w.Body.Len() >= declared {
+		t.Fatalf("不应交付完整长度的响应体（上游只写了 128KB）")
+	}
+}
+
+// TestReaderAudioCacheServesFromDisk 音轨首次拉取后落盘；后续请求即使带着一张
+// 新签的票（query 全变了）也不再回源——这是让播放不受跨境链路抖动影响的关键。
+func TestReaderAudioCacheServesFromDisk(t *testing.T) {
+	svc, srv, book := prepareMediaTicketBook(t)
+	router := mediaRouterForTest(svc)
+	signed := primeTicketBook(t, svc, book.ID)
+
+	code, body := getReaderMedia(t, router, signed)
+	if code != http.StatusOK || !strings.Contains(body, "fake-audio-bytes") {
+		t.Fatalf("首次拉取失败 status=%d body=%q", code, body)
+	}
+	if got := srv.mediaRequests(); got != 1 {
+		t.Fatalf("首次拉取应对上游请求 1 次，实际 %d", got)
+	}
+
+	// 同一段音频的另一张票：URL 的 query 不同，缓存键必须一致。
+	rotated := svc.Reader.ProxyURL(book.ID, srv.URL+"/media?t=ticket-rotated")
+	code, body = getReaderMedia(t, router, rotated)
+	if code != http.StatusOK || !strings.Contains(body, "fake-audio-bytes") {
+		t.Fatalf("命中缓存失败 status=%d body=%q", code, body)
+	}
+	if got := srv.mediaRequests(); got != 1 {
+		t.Fatalf("命中缓存后不该再回源，实际上游请求 %d 次", got)
+	}
+}
+
+// TestReaderAudioCacheAbortsOnTruncatedUpstream 首播直通模式下上游持续截断的契约：
+//
+// 冷启动走边下边发（见 handleStreamingReaderAudio），响应头和前缀字节在探测
+// 通过后就已发出，因此中途截断不可能再改写成 502 —— 必须中止连接让客户端
+// 判定「传输不完整」，同时保留 .part 分片。
+//
+// 关键不变量：**绝不能留下可命中的完整缓存**（否则后续会把截断音频当真完整
+// 文件下发，播放器表现为「时长正确但没有声音」）。下一次请求带着分片走续传
+// 路径，那时才可能给出 502 + 明确文案。
+func TestReaderAudioCacheAbortsOnTruncatedUpstream(t *testing.T) {
+	const declared = 400 << 10
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "audio/mp4")
+		w.Header().Set("Content-Length", strconv.Itoa(declared))
+		payload := make([]byte, 8<<10)
+		for written := 0; written < 128<<10; written += len(payload) {
+			if _, err := w.Write(payload); err != nil {
+				return
+			}
+		}
+		w.(http.Flusher).Flush()
+		if hj, ok := w.(http.Hijacker); ok {
+			if conn, _, err := hj.Hijack(); err == nil {
+				_ = conn.Close()
+			}
+		}
+	}))
+	defer srv.Close()
+
+	svc, _, book := prepareMediaTicketBookWithUpstream(t, srv.URL)
+	router := mediaRouterForTest(svc)
+	// 无后缀地址 + 音频书籍 → 走音轨落盘缓存。
+	signed := svc.Reader.ProxyURL(book.ID, srv.URL+"/media")
+
+	w := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodGet, signed, nil)
+	// panic(http.ErrAbortHandler) 由 net/http 捕获；httptest 下会向上冒泡，
+	// 这里断言它确实发生了（即「没有静默地把半截音频当成功」）。
+	func() {
+		defer func() {
+			recovered := recover()
+			if recovered == nil {
+				t.Fatalf("上游截断时必须中止响应，实际正常返回了 %d 字节", w.Body.Len())
+			}
+			if recovered != http.ErrAbortHandler {
+				t.Fatalf("中止响应时应使用 http.ErrAbortHandler，实际 %v", recovered)
+			}
+		}()
+		router.ServeHTTP(w, req)
+	}()
+
+	if w.Body.Len() >= declared {
+		t.Fatalf("不应交付完整长度的响应体（上游只写了 128KB）")
+	}
+	if _, _, ok := svc.Reader.OpenCachedRemoteAudio(book.ID, srv.URL+"/media"); ok {
+		t.Fatalf("中断的下载不能留下可命中的完整缓存")
+	}
+	if !svc.Reader.HasPartialRemoteAudio(book.ID, srv.URL+"/media") {
+		t.Fatalf("中断后应保留 .part 分片供续传")
+	}
+
+	// 二次请求带分片走续传路径；上游依旧忽略 Range 并截断 → 这时才给 502。
+	code, body := getReaderMedia(t, router, signed)
+	if code != http.StatusBadGateway {
+		t.Fatalf("续传路径持续失败应返回 502，实际 %d body=%.120s", code, body)
+	}
+	if strings.Contains(body, "ftyp") {
+		t.Fatalf("不能把半截音频交给客户端: %q", body)
+	}
+	if _, _, ok := svc.Reader.OpenCachedRemoteAudio(book.ID, srv.URL+"/media"); ok {
+		t.Fatalf("失败的续传仍不应留下完整缓存")
+	}
+}
+
+func mediaRouterForTest(svc *service.Container) *gin.Engine {
+	gin.SetMode(gin.TestMode)
+	r := gin.New()
+	// /api/reader/media 挂在公共 api 组（签名鉴权，不需要 JWT），单独注册即可。
+	r.GET("/api/reader/media", readerMediaProxyHandler(svc))
+	return r
+}
+
+func getReaderMedia(t *testing.T, router *gin.Engine, signedPath string) (int, string) {
+	t.Helper()
+	w := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodGet, signedPath, nil)
+	router.ServeHTTP(w, req)
+	return w.Code, w.Body.String()
+}
+
+// primeTicketBook 先读一次章节（签出第一张票并落缓存），返回该音轨的签名代理路径。
+func primeTicketBook(t *testing.T, svc *service.Container, bookID string) string {
+	t.Helper()
+	out, err := svc.Reader.GetContentForBook(t.Context(), "u1", bookID, 0, reader.ContentOptions{})
+	if err != nil {
+		t.Fatalf("首次取章节失败: %v", err)
+	}
+	if len(out.Tracks) != 1 {
+		t.Fatalf("音轨数 = %d，期望 1", len(out.Tracks))
+	}
+	return out.Tracks[0]
+}
+
+// ─── 模拟「中转现签 CDN 直链」的上游 ───────────────────────────────────────
+
+// mediaTicketServer：
+//   - /book/1  详情页
+//   - /content 章节正文，每次请求签一张新票
+//   - /media   媒体本体，只认最新签出的票；旧票回**空的 401**（与腾讯 CDN 一致）
+//   - /img/*   图片资源，固定 403（模拟防盗链）
+type mediaTicketServer struct {
+	*httptest.Server
+	mu         sync.Mutex
+	issued     []string
+	hits       int
+	mediaHits  int
+	noToken    bool
+	errorPage  bool
+	alwaysDeny bool
+}
+
+func newMediaTicketServer(t *testing.T) *mediaTicketServer {
+	t.Helper()
+	s := &mediaTicketServer{}
+	s.Server = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch {
+		case strings.HasPrefix(r.URL.Path, "/book/1"):
+			w.Header().Set("Content-Type", "text/html; charset=utf-8")
+			_, _ = w.Write([]byte(`<html><body><h1>票源之书</h1></body></html>`))
+		case r.URL.Path == "/content":
+			s.mu.Lock()
+			s.hits++
+			n := s.hits
+			noToken := s.noToken
+			s.mu.Unlock()
+			w.Header().Set("Content-Type", "application/json; charset=utf-8")
+			if noToken {
+				_, _ = w.Write([]byte(`{"data":{"url":""}}`))
+				return
+			}
+			token := s.newTokenLocked(fmt.Sprintf("ticket-%d", n))
+			_, _ = w.Write([]byte(fmt.Sprintf(`{"data":{"url":"%s/media?t=%s"}}`, s.URL, token)))
+		case r.URL.Path == "/media":
+			s.mu.Lock()
+			s.mediaHits++
+			deny := s.alwaysDeny
+			s.mu.Unlock()
+			if deny {
+				// 与腾讯 CDN 一致：连新签的票也直接空 401（成批拒绝的那几分钟）。
+				w.WriteHeader(http.StatusUnauthorized)
+				return
+			}
+			if s.errorPageNow() {
+				w.Header().Set("Content-Type", "text/html; charset=utf-8")
+				_, _ = w.Write([]byte(`<html><body>ticket expired</body></html>`))
+				return
+			}
+			token := r.URL.Query().Get("t")
+			s.mu.Lock()
+			valid := len(s.issued) > 0 && s.issued[len(s.issued)-1] == token
+			s.mu.Unlock()
+			if !valid {
+				// 与上游一致：空 body、无 Content-Type。
+				w.WriteHeader(http.StatusUnauthorized)
+				return
+			}
+			w.Header().Set("Content-Type", "audio/mp4")
+			_, _ = w.Write([]byte("\x00\x00\x00\x20ftypmp42fake-audio-bytes"))
+		case strings.HasPrefix(r.URL.Path, "/img/"):
+			w.WriteHeader(http.StatusForbidden)
+		default:
+			http.NotFound(w, r)
+		}
+	}))
+	t.Cleanup(s.Close)
+	return s
+}
+
+// newTokenLocked 签一张新票（调用方需持有或随后获取锁；这里内部加锁）。
+func (s *mediaTicketServer) newTokenLocked(token string) string {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.issued = append(s.issued, token)
+	return token
+}
+
+// rotate 模拟「中转又签了一张新票」：章节缓存里那张就此失效。
+func (s *mediaTicketServer) rotate() {
+	s.mu.Lock()
+	s.issued = append(s.issued, fmt.Sprintf("rotated-%d", len(s.issued)))
+	s.mu.Unlock()
+}
+
+// stopIssuing 让书源此后给不出播放地址（模拟中转本身挂了）。
+func (s *mediaTicketServer) stopIssuing() {
+	s.mu.Lock()
+	s.noToken = true
+	s.mu.Unlock()
+}
+
+// serveErrorPage 让媒体端点改用 200 + HTML 错误页（直链失效的另一种形态）。
+func (s *mediaTicketServer) serveErrorPage() {
+	s.mu.Lock()
+	s.errorPage = true
+	s.mu.Unlock()
+}
+
+// denyAlways 让媒体端点连新签的票也一律空 401（模拟上游成批拒绝的那几分钟）。
+func (s *mediaTicketServer) denyAlways() {
+	s.mu.Lock()
+	s.alwaysDeny = true
+	s.mu.Unlock()
+}
+
+func (s *mediaTicketServer) errorPageNow() bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return s.errorPage
+}
+
+func (s *mediaTicketServer) contentHits() int {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return s.hits
+}
+
+func (s *mediaTicketServer) mediaRequests() int {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return s.mediaHits
+}
+
+// prepareMediaTicketBookWithUpstream 用指定的上游地址建一本书（上游由调用方提供）。
+func prepareMediaTicketBookWithUpstream(t *testing.T, upstream string) (*service.Container, *mediaTicketServer, *model.ReaderBook) {
+	t.Helper()
+	svc := newReaderHandlerContainer(t)
+	svc.Cfg.Cache.CacheDir = t.TempDir()
+	// 占位 ticket server：只用来满足清理钩子，不参与请求。
+	srv := newMediaTicketServer(t)
+	srcJSON := fmt.Sprintf(`{
+  "bookSourceName": "上游直连测试",
+  "bookSourceType": 1,
+  "bookSourceUrl": %q,
+  "ruleContent": {"content": "$.data.url"}
+}`, upstream)
+	if _, err := svc.Reader.ImportSources(t.Context(), "u1", srcJSON); err != nil {
+		t.Fatalf("导入书源失败: %v", err)
+	}
+	srcs, err := svc.Reader.ListSources(t.Context(), "u1")
+	if err != nil || len(srcs) == 0 {
+		t.Fatalf("读不到书源: %v", err)
+	}
+	book, err := svc.Reader.AddBook(t.Context(), "u1", reader.SearchOrigin{
+		SourceID:   srcs[0].ID,
+		Origin:     upstream,
+		OriginName: "上游直连测试",
+		OriginType: 1,
+		BookURL:    upstream + "/book/1",
+	}, "上游直连之书", "某作者", "")
+	if err != nil {
+		t.Fatalf("加入书架失败: %v", err)
+	}
+	return svc, srv, book
+}
+
+func prepareMediaTicketBook(t *testing.T) (*service.Container, *mediaTicketServer, *model.ReaderBook) {
+	t.Helper()
+	svc := newReaderHandlerContainer(t)
+	// 章节缓存必须落在磁盘上：换票要凭落盘载荷找回「这个地址属于哪一章」。
+	// newReaderHandlerContainer 只给空 cfg，这里补一个临时缓存目录。
+	svc.Cfg.Cache.CacheDir = t.TempDir()
+	srv := newMediaTicketServer(t)
+	srcJSON := fmt.Sprintf(`{
+  "bookSourceName": "票源测试",
+  "bookSourceType": 1,
+  "bookSourceUrl": %q,
+  "ruleContent": {"content": "$.data.url"}
+}`, srv.URL)
+	if _, err := svc.Reader.ImportSources(t.Context(), "u1", srcJSON); err != nil {
+		t.Fatalf("导入书源失败: %v", err)
+	}
+	srcs, err := svc.Reader.ListSources(t.Context(), "u1")
+	if err != nil || len(srcs) == 0 {
+		t.Fatalf("读不到书源: %v", err)
+	}
+	book, err := svc.Reader.AddBook(t.Context(), "u1", reader.SearchOrigin{
+		SourceID:   srcs[0].ID,
+		Origin:     srv.URL,
+		OriginName: "票源测试",
+		OriginType: 1,
+		BookURL:    srv.URL + "/book/1",
+	}, "票源之书", "某作者", "")
+	if err != nil {
+		t.Fatalf("加入书架失败: %v", err)
+	}
+	if err := svc.Reader.SaveChapters(t.Context(), book.ID, []reader.ChapterInput{
+		{Index: 0, Title: "第一章", URL: srv.URL + "/content"},
+	}); err != nil {
+		t.Fatalf("保存目录失败: %v", err)
+	}
+	return svc, srv, book
+}
+
+// TestReaderAudioStreamsFirstByteBeforeDownloadCompletes 首播 TTFB 回归：
+// 冷启动必须边下边发，而不是等整章下完再一次性下发。
+//
+// 上游在第一块之后卡住不放：直通实现此时应已把那块转给客户端，所以读端能
+// 拿到字节；旧实现（整段下载后才 ServeContent）在 release 关闭前一个字节都
+// 不会发出，读端会一直阻塞。
+func TestReaderAudioStreamsFirstByteBeforeDownloadCompletes(t *testing.T) {
+	// 总长必须大于探测窗口（readerMediaProbeBytes=64KB）：首播要先读完这一小段
+	// 才能判断上游给的是错误页还是媒体，这之后才可能外发。卡点在探测结束之后，
+	// 才能证明「整段下完才发」和「边下边发」的区别。
+	const chunks = 16
+	const chunkBytes = 16 << 10
+	const stallAfter = 4 // 写满探测窗口（4×16KB=64KB）后卡住
+	release := make(chan struct{})
+	var releaseOnce sync.Once
+	unblock := func() { releaseOnce.Do(func() { close(release) }) }
+	defer unblock()
+
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "audio/mp4")
+		w.Header().Set("Content-Length", strconv.Itoa(chunks*chunkBytes))
+		w.WriteHeader(http.StatusOK)
+		for i := 0; i < chunks; i++ {
+			if _, err := w.Write(bytes.Repeat([]byte("m4a!"), chunkBytes/4)); err != nil {
+				return
+			}
+			w.(http.Flusher).Flush()
+			if i+1 == stallAfter {
+				// 探测窗口刚写满就卡住，直到测试确认客户端已经收到字节。
+				<-release
+			}
+		}
+	}))
+	defer upstream.Close()
+
+	svc, _, book := prepareMediaTicketBookWithUpstream(t, upstream.URL)
+	signed := svc.Reader.ProxyURL(book.ID, upstream.URL+"/media")
+
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	router.GET("/api/reader/media", readerMediaProxyHandler(svc))
+	proxy := httptest.NewServer(router)
+	defer proxy.Close()
+
+	resp, err := http.Get(proxy.URL + signed)
+	if err != nil {
+		t.Fatalf("请求媒体代理失败: %v", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		t.Fatalf("直通应返回 200，实际 %d", resp.StatusCode)
+	}
+
+	// 上游仍卡在 release 上：此时能读到第一批字节，才说明是边下边发。
+	first := make([]byte, 4)
+	readDone := make(chan error, 1)
+	go func() {
+		_, readErr := io.ReadFull(resp.Body, first)
+		readDone <- readErr
+	}()
+	select {
+	case readErr := <-readDone:
+		if readErr != nil {
+			t.Fatalf("读取首批字节失败: %v", readErr)
+		}
+	case <-time.After(5 * time.Second):
+		unblock()
+		t.Fatalf("首播没有边下边发：上游卡在中途（仍有 %d 字节未发）时客户端读不到任何字节",
+			(chunks-stallAfter)*chunkBytes)
+	}
+	if string(first) != "m4a!" {
+		t.Fatalf("首批字节内容不对: %q", first)
+	}
+
+	// 放行上游，把剩余字节读完并确认缓存落盘完整。
+	unblock()
+	rest, readErr := io.ReadAll(resp.Body)
+	if readErr != nil {
+		t.Fatalf("读取剩余字节失败: %v", readErr)
+	}
+	if total := 4 + len(rest); total != chunks*chunkBytes {
+		t.Fatalf("交付字节 = %d，期望 %d", total, chunks*chunkBytes)
+	}
+	// 客户端读完最后一个字节时，服务端可能还在做 truncate + rename：
+	// 落盘完成是 handler 的收尾动作，给一个有限窗口等它。
+	deadline := time.Now().Add(2 * time.Second)
+	for !svc.Reader.HasCachedRemoteAudio(book.ID, upstream.URL+"/media") {
+		if time.Now().After(deadline) {
+			t.Fatalf("直通完成后应命中缓存")
+		}
+		time.Sleep(10 * time.Millisecond)
+	}
+}
@@ -13,6 +13,8 @@ func registerAdminRoutes(api *gin.RouterGroup, cfg *config.Config, svc *service.
 	admin := api.Group("/admin")
 	admin.Use(middleware.AuthRequired(cfg.Secrets.JWTSecret), middleware.AdminRequired())
 	registerAdminUserRoutes(admin, svc)
+	admin.GET("/tasks", backgroundTasksHandler(svc))
+	admin.GET("/quality", mediaQualityHandler(svc))
 	registerAdminPermissionRoutes(admin, svc)
 	registerAdminSystemRoutes(admin, svc)
 	registerAdminBackupRoutes(admin, svc)
@@ -20,6 +22,7 @@ func registerAdminRoutes(api *gin.RouterGroup, cfg *config.Config, svc *service.
 	registerAdminAPIConfigRoutes(admin, svc)
 	registerAdminRecognitionWordRoutes(admin, svc)
 	registerAdminStrmRoutes(admin, svc)
+	registerAdminCloudDownloadRoutes(admin, svc)
 	registerAdminScraperRoutes(admin, svc)
 	registerAdminDatabaseRoutes(admin, svc)

@@ -143,6 +146,7 @@ func registerAdminSystemRoutes(admin *gin.RouterGroup, svc *service.Container) {
 func registerAdminBackupRoutes(admin *gin.RouterGroup, svc *service.Container) {
 	admin.GET("/backups", listBackupsHandler(svc))
 	admin.POST("/backups", createBackupHandler(svc))
+	admin.GET("/backups/download", downloadBackupHandler(svc))
 	admin.DELETE("/backups", deleteBackupHandler(svc))
 	admin.POST("/backups/restore", restoreBackupHandler(svc))
 }
@@ -36,6 +36,9 @@ func registerAuthedLibraryRoutes(authed *gin.RouterGroup, svc *service.Container
 	authed.GET("/libraries", listLibrariesHandler(svc))
 	authed.POST("/libraries", middleware.AdminRequired(), createLibraryHandler(svc))
 	authed.GET("/libraries/:id", getLibraryHandler(svc))
+	// 服务端生成的媒体库封面（成员海报拼图），Web / App / Emby 共用同一份。
+	authed.GET("/libraries/:id/cover", libraryCoverHandler(svc))
+	authed.HEAD("/libraries/:id/cover", libraryCoverHandler(svc))
 	authed.PATCH("/libraries/:id", middleware.AdminRequired(), updateLibraryHandler(svc))
 	authed.PUT("/libraries/reorder", middleware.AdminRequired(), reorderLibrariesHandler(svc))
 	authed.DELETE("/libraries/:id", middleware.AdminRequired(), deleteLibraryHandler(svc))
@@ -74,6 +74,7 @@ func registerAuthedPlaybackExtraRoutes(authed *gin.RouterGroup, svc *service.Con
 	authed.GET("/playback/:id/info", playbackInfoHandler(svc))
 	authed.GET("/playback/:id/resume", playbackResumeHandler(svc))
 	authed.GET("/playback/:id/segments", playbackSegmentsHandler(svc))
+	authed.PUT("/playback/:id/segments", playbackSegmentsMarkHandler(svc))
 	authed.POST("/playback/:id/progress", playbackProgressHandler(svc))
 	authed.GET("/playback/:id/external-players", externalPlayersHandler(svc))
 	authed.GET("/playback/:id/external-url", externalURLHandler(svc))
@@ -27,7 +27,15 @@ func hlsPlaylistHandler(svc *service.Container) gin.HandlerFunc {
 		if !enforceScopedPlaybackToken(c, m.ID) {
 			return
 		}
-		err = svc.Stream.ServeHLSPlaylist(c.Writer, c.Request, c.Param("id"))
+		scope, ok := localHLSPlaybackScope(c)
+		if !ok {
+			return
+		}
+		err = svc.Stream.ServeHLSPlaylist(c.Writer, c.Request, c.Param("id"), scope)
+		if errors.Is(err, service.ErrHLSGenerationSuperseded) {
+			c.JSON(http.StatusConflict, gin.H{"code": "hls_generation_superseded", "error": err.Error()})
+			return
+		}
 		if errors.Is(err, service.ErrMediaNotFound) {
 			c.JSON(http.StatusNotFound, gin.H{"error": "not found"})
 			return
@@ -62,7 +70,11 @@ func hlsSegmentHandler(svc *service.Container) gin.HandlerFunc {
 		if !enforceScopedPlaybackToken(c, m.ID) {
 			return
 		}
-		err = svc.Stream.ServeHLSSegment(c.Writer, c.Request, c.Param("id"), c.Param("seg"))
+		scope, ok := localHLSPlaybackScope(c)
+		if !ok {
+			return
+		}
+		err = svc.Stream.ServeHLSSegment(c.Writer, c.Request, c.Param("id"), c.Param("seg"), scope)
 		if err != nil {
 			c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
 			return
@@ -72,11 +84,39 @@ func hlsSegmentHandler(svc *service.Container) gin.HandlerFunc {

 func stopTranscodeHandler(svc *service.Container) gin.HandlerFunc {
 	return func(c *gin.Context) {
-		svc.Transcoder.StopJob(c.Param("id"))
+		m, err := findMediaForPlaybackEndpoint(c, svc, c.Param("id"))
+		if err != nil || m == nil || !mediaVisibleForRequest(c, svc, m) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "media not found"})
+			return
+		}
+		if !enforceScopedPlaybackToken(c, m.ID) {
+			return
+		}
+		scope, ok := localHLSPlaybackScope(c)
+		if !ok {
+			return
+		}
+		if svc.Transcoder != nil {
+			svc.Transcoder.StopPlayback(m.ID, scope)
+		}
 		c.Status(http.StatusNoContent)
 	}
 }

+func localHLSPlaybackScope(c *gin.Context) (service.HLSPlaybackScope, bool) {
+	userID := currentUserID(c)
+	if userID == "" {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "missing playback owner"})
+		return service.HLSPlaybackScope{}, false
+	}
+	scope, err := service.HLSPlaybackScopeForRequest(c.Request, userID)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return service.HLSPlaybackScope{}, false
+	}
+	return scope, true
+}
+
 func imageProxyHandler(svc *service.Container) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		raw := c.Query("url")
@@ -27,21 +27,45 @@ import (

 // historyListHandler returns the caller's history rows joined with the
 // matching media in a single response.
+//
+// include_media=0 只返回历史行本身。客户端判断「继续播放」指向哪一集时只
+// 需要 media_id/position_ms；带上整条 media 会让 300 条的响应从 ~40KB 涨到
+// ~420KB。更重要的是服务端不再 hydrate：不查整条 media、也不为挂载条目
+// 逐条请求上游 Emby（见 PlaybackService.RecentHistoryWithoutMedia）。
 func historyListHandler(svc *service.Container) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		uid, _ := c.Get(middleware.CtxUserID)
+		userID := toString(uid)
 		limit, _ := strconv.Atoi(c.DefaultQuery("limit", "50"))
 		if limit <= 0 || limit > 500 {
 			limit = 50
 		}
-		items, err := svc.Playback.RecentHistory(c.Request.Context(), toString(uid), limit)
+		includeMedia := true
+		if raw := strings.TrimSpace(c.Query("include_media")); raw != "" {
+			if parsed, err := strconv.ParseBool(raw); err == nil {
+				includeMedia = parsed
+			}
+		}
+		ctx := c.Request.Context()
+		visibility := mediaVisibilityForRequest(c, svc)
+		if !includeMedia {
+			// 可见性由服务层用窄列查询判定，handler 不再需要 media。
+			items, err := svc.Playback.RecentHistoryWithoutMedia(ctx, userID, limit, visibility)
+			if err != nil {
+				c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+				return
+			}
+			c.JSON(http.StatusOK, items)
+			return
+		}
+		items, err := svc.Playback.RecentHistory(ctx, userID, limit)
 		if err != nil {
 			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 			return
 		}
-		visibility := mediaVisibilityForRequest(c, svc)
 		filtered := make([]service.HistoryItem, 0, len(items))
 		for _, item := range items {
+			// 可见性按 media 判断：媒体已删除/远端取不到时仍然保留这条历史。
 			if item.Media == nil || visibility.Allows(item.Media) {
 				filtered = append(filtered, item)
 			}
@@ -103,3 +103,149 @@ func TestHistoryContinueRemovesMissingMedia(t *testing.T) {
 		t.Fatalf("stale history rows remaining = %d, want 0", staleCount)
 	}
 }
+
+// include_media=0 只是不把 media 写进响应，行数和可见性判断都不变。
+func TestHistoryListCanOmitEmbeddedMedia(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.AutoMigrate(&model.PlaybackHistory{}, &model.Media{}); err != nil {
+		t.Fatal(err)
+	}
+
+	media := model.Media{
+		Base:  model.Base{ID: "media-1"},
+		Title: "影片",
+		Path:  "/media/one.mkv",
+	}
+	if err := db.Create(&media).Error; err != nil {
+		t.Fatal(err)
+	}
+	if err := db.Create(&model.PlaybackHistory{
+		Base:       model.Base{ID: "history-1"},
+		UserID:     "user-1",
+		MediaID:    media.ID,
+		PositionMs: 30_000,
+		DurationMs: 120_000,
+		WatchedAt:  time.Now(),
+	}).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	repos := repository.New(db)
+	svc := &service.Container{
+		Log:      zap.NewNop(),
+		Repo:     repos,
+		Playback: service.NewPlaybackService(zap.NewNop(), repos),
+	}
+	router := gin.New()
+	router.Use(func(c *gin.Context) {
+		c.Set(middleware.CtxUserID, "user-1")
+		c.Next()
+	})
+	router.GET("/watch-history", historyListHandler(svc))
+
+	type listRow struct {
+		MediaID string       `json:"media_id"`
+		Media   *model.Media `json:"media"`
+	}
+
+	full := httptest.NewRecorder()
+	router.ServeHTTP(full, httptest.NewRequest(http.MethodGet, "/watch-history?limit=10", nil))
+	var fullRows []listRow
+	if err := json.Unmarshal(full.Body.Bytes(), &fullRows); err != nil {
+		t.Fatal(err)
+	}
+	if len(fullRows) != 1 || fullRows[0].Media == nil || fullRows[0].Media.ID != media.ID {
+		t.Fatalf("default response should embed media: %s", full.Body.String())
+	}
+
+	lean := httptest.NewRecorder()
+	router.ServeHTTP(lean, httptest.NewRequest(http.MethodGet, "/watch-history?limit=10&include_media=0", nil))
+	var leanRows []listRow
+	if err := json.Unmarshal(lean.Body.Bytes(), &leanRows); err != nil {
+		t.Fatal(err)
+	}
+	if len(leanRows) != 1 || leanRows[0].MediaID != media.ID {
+		t.Fatalf("lean response should keep the row: %s", lean.Body.String())
+	}
+	if leanRows[0].Media != nil {
+		t.Fatalf("include_media=0 must not embed media: %s", lean.Body.String())
+	}
+}
+
+// TestHistoryListIncludeMediaFalseSkipsHydration 保证 include_media=0 时服务端
+// 真的不 hydrate media：响应里只有历史行（客户端按 media_id 匹配续播目标）。
+func TestHistoryListIncludeMediaFalseSkipsHydration(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.AutoMigrate(&model.PlaybackHistory{}, &model.Media{}); err != nil {
+		t.Fatal(err)
+	}
+	if err := db.Create(&model.Media{
+		Base:  model.Base{ID: "media-1"},
+		Title: "影片",
+		Path:  "/media/1.mkv",
+	}).Error; err != nil {
+		t.Fatal(err)
+	}
+	now := time.Now()
+	for i, mediaID := range []string{"media-1", "media-deleted"} {
+		if err := db.Create(&model.PlaybackHistory{
+			Base:       model.Base{ID: "history-" + mediaID},
+			UserID:     "user-1",
+			MediaID:    mediaID,
+			PositionMs: 30_000,
+			DurationMs: 120_000,
+			WatchedAt:  now.Add(-time.Duration(i) * time.Minute),
+		}).Error; err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	repos := repository.New(db)
+	svc := &service.Container{
+		Log:      zap.NewNop(),
+		Repo:     repos,
+		Playback: service.NewPlaybackService(zap.NewNop(), repos),
+	}
+	router := gin.New()
+	router.Use(func(c *gin.Context) {
+		c.Set(middleware.CtxUserID, "user-1")
+		c.Next()
+	})
+	router.GET("/watch-history", historyListHandler(svc))
+
+	for _, path := range []string{
+		"/watch-history?limit=10&include_media=0",
+		"/watch-history?limit=10&include_media=false",
+	} {
+		req := httptest.NewRequest(http.MethodGet, path, nil)
+		rec := httptest.NewRecorder()
+		router.ServeHTTP(rec, req)
+		if rec.Code != http.StatusOK {
+			t.Fatalf("%s status = %d, body = %s", path, rec.Code, rec.Body.String())
+		}
+		var rows []map[string]any
+		if err := json.Unmarshal(rec.Body.Bytes(), &rows); err != nil {
+			t.Fatalf("%s decode: %v", path, err)
+		}
+		// 媒体已删除的历史也保留：客户端只按 media_id 判断有没有记录。
+		if len(rows) != 2 {
+			t.Fatalf("%s rows = %d, want 2 (%s)", path, len(rows), rec.Body.String())
+		}
+		for _, row := range rows {
+			if _, ok := row["media"]; ok {
+				t.Fatalf("%s should not embed media: %v", path, row)
+			}
+			if row["media_id"] == "" || row["media_id"] == nil {
+				t.Fatalf("%s missing media_id: %v", path, row)
+			}
+		}
+	}
+}
@@ -7,6 +7,7 @@ import (
 	"compress/flate"
 	"compress/gzip"
 	"compress/zlib"
+	"crypto/tls"
 	"io"
 	"net/http"
 	"net/url"
@@ -88,10 +89,51 @@ func StripAcceptEncoding(h http.Header) {
 //
 // When useProxy is false, the client is created without proxy plumbing so
 // the request goes out direct, matching the user's checkbox intent.
+//
+// 注意 http.Client.Timeout 是「整个请求」的上限，包含读完响应体。书源的
+// 搜索/目录/正文都是小响应，30 秒足够；但同一个 client 也被用来流转发
+// 音频/视频（见 NewMediaHTTPClient），那里必须换一个没有整体超时的 client。
 func NewSiteHTTPClient(timeoutSeconds int, useProxy bool) *http.Client {
 	if timeoutSeconds <= 0 {
 		timeoutSeconds = 15
 	}
+	return &http.Client{
+		Timeout:   time.Duration(timeoutSeconds) * time.Second,
+		Transport: newSiteTransport(useProxy),
+	}
+}
+
+// NewMediaHTTPClient 拉取并转发媒体流（音频/视频/大图）的客户端。
+//
+// 为什么不能用 NewSiteHTTPClient：http.Client.Timeout 会覆盖「读完 body」这个
+// 阶段。一个 4MB 的 m4a 在跨境链路上很容易超过 30 秒，一旦超时，net/http 会
+// 直接掐断响应体，而调用方的 io.Copy 只是正常返回 —— 表现为**静默截断**
+// （播放器拿到半首歌，或判「格式不支持」），或者上游慢到 Do 本身报错 → 502。
+//
+// 为什么强制 HTTP/1.1：实测腾讯 CDN（vb.stream.tencentmusic.com）的 h2 边缘在
+// 长连接大文件上不按预期回 WINDOW_UPDATE，Go 的 http2 Transport 初始连接窗口
+// 是 1MiB，于是下载**稳定卡在 1MiB/2MiB/3MiB 整数倍**处断开；同一 URL 用
+// HTTP/1.1（wget、curl --http1.1）从头到尾都完整。因此媒体通路固定走 h1.1：
+// 音视频本来就没有「多路复用省请求」的收益，反而是流控 bug 的受害者。
+func NewMediaHTTPClient(useProxy bool) *http.Client {
+	tr := newSiteTransport(useProxy)
+	// 等响应头最多 90 秒：跨境 CDN 首包偶发要几十秒，但绝不能无上限挂着。
+	tr.ResponseHeaderTimeout = 90 * time.Second
+	// 媒体是长连接大流量，连接池开大一些，避免并发取图/拖动进度时互相排队。
+	tr.MaxIdleConns = 32
+	tr.MaxIdleConnsPerHost = 16
+	// 关闭 HTTP/2：见上面的流控说明。
+	tr.ForceAttemptHTTP2 = false
+	tr.TLSNextProto = map[string]func(string, *tls.Conn) http.RoundTripper{}
+	// 不复用连接：实测腾讯 CDN 的边缘在「同一条 keep-alive 连接上连续取多个
+	// 大对象」时会直接 RST 第二个请求的响应体（容器内 wget/curl 每次新建连接
+	// 就完全正常）。音视频请求本来就稀疏，为省一次 TLS 握手去冒截断风险不划算。
+	tr.DisableKeepAlives = true
+	return &http.Client{Transport: tr}
+}
+
+// newSiteTransport 书源请求共用的 Transport（媒体与规则请求配置一致的部分）。
+func newSiteTransport(useProxy bool) *http.Transport {
 	tr := &http.Transport{
 		MaxIdleConns:          16,
 		MaxIdleConnsPerHost:   4,
@@ -104,10 +146,7 @@ func NewSiteHTTPClient(timeoutSeconds int, useProxy bool) *http.Client {
 			return ProxyFromEnvironmentOrSystem(r)
 		}
 	}
-	return &http.Client{
-		Timeout:   time.Duration(timeoutSeconds) * time.Second,
-		Transport: tr,
-	}
+	return tr
 }

 // HTTPHeaderPresets returns a map of realistic browser HTTP headers.
@@ -17,12 +17,24 @@ var gzipExcludedExtensions = []string{

 // apiGzipExcludedPrefixes 大文件流式传输（Range 语义）与 WS/SSE 长连接
 // 不参与 gzip：压缩会破坏 Range / 逐块推送语义。
+//
+// 阅读媒体代理（/api/reader/media、/api/reader/local/audio、
+// /api/reader/audio/transcode）同样必须排除，原因有两条：
+//   - 它们透传上游的 206 Partial Content。gin-contrib/gzip 在压缩时会删掉
+//     Content-Length，却把 Content-Range 原样留下，客户端看到的是「声明
+//     N 字节、实际收到 M 字节的 gzip 流」，自己发 Accept-Encoding 的播放器
+//     （ExoPlayer 不透明处理）直接判 ERROR_CODE_PARSING_CONTAINER_UNSUPPORTED。
+//   - 音视频本来就是压缩格式，再 gzip 一遍只烧 CPU（3.5MB 的 m4a 压完还是
+//     3.5MB 量级），对带宽没有收益。
 var apiGzipExcludedPrefixes = []string{
 	"/api/stream/",
 	"/api/hls/",
 	"/api/img",
 	"/api/subtitles/",
 	"/api/strm/play/",
+	"/api/reader/media",
+	"/api/reader/local/audio",
+	"/api/reader/audio/transcode",
 	"/api/ws",
 	"/api/events",
 }
@@ -70,6 +70,52 @@ func TestGzipAPIExcludesStreamPath(t *testing.T) {
 	}
 }

+// TestGzipAPIExcludesReaderMedia 阅读媒体代理必须排除在 gzip 之外。
+//
+// 它会透传 CDN 的 206 Partial Content。gin-contrib/gzip 压缩时会删掉
+// Content-Length 却保留 Content-Range，客户端看到「声明 N 字节、实收 M 字节」，
+// 自己发 Accept-Encoding 的播放器（ExoPlayer）直接判
+// ERROR_CODE_PARSING_CONTAINER_UNSUPPORTED，表现为「音频格式不支持」。
+func TestGzipAPIExcludesReaderMedia(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	api := router.Group("/api")
+	api.Use(GzipAPI())
+	// 用 206 + Content-Range 模拟真实的音频分段响应。
+	segment := func(c *gin.Context) {
+		c.Header("Content-Range", "bytes 0-99/100")
+		c.Data(http.StatusPartialContent, "audio/mp4", []byte(strings.Repeat("x", 4096)))
+	}
+	for _, path := range []string{
+		"/reader/media",
+		"/reader/local/audio",
+		"/reader/audio/transcode",
+	} {
+		api.GET(path, segment)
+	}
+
+	for _, path := range []string{
+		"/reader/media",
+		"/reader/local/audio",
+		"/reader/audio/transcode",
+	} {
+		req := httptest.NewRequest(http.MethodGet, "/api"+path+"?b=book&u=x&s=y", nil)
+		req.Header.Set("Accept-Encoding", "gzip")
+		w := httptest.NewRecorder()
+		router.ServeHTTP(w, req)
+
+		if got := w.Header().Get("Content-Encoding"); got == "gzip" {
+			t.Errorf("%s 不该被 gzip（Range 语义会被破坏）", path)
+		}
+		if got := w.Header().Get("Content-Range"); got != "bytes 0-99/100" {
+			t.Errorf("%s 的 Content-Range 被破坏: %q", path, got)
+		}
+		if w.Body.Len() != 4096 {
+			t.Errorf("%s 响应体长度 = %d，期望 4096", path, w.Body.Len())
+		}
+	}
+}
+
 func TestGzipStaticCompressesAssets(t *testing.T) {
 	router := newGzipTestRouter()

@@ -0,0 +1,23 @@
+package model
+
+import "time"
+
+// BackgroundTaskRecord persists the operator-facing lifecycle of scan,
+// organize, and other long-running application tasks.
+type BackgroundTaskRecord struct {
+	ID         string     `gorm:"primaryKey;size:36" json:"id"`
+	Kind       string     `gorm:"index;size:32;not null" json:"kind"`
+	Name       string     `gorm:"size:255;not null" json:"name"`
+	Status     string     `gorm:"index;size:24;not null" json:"status"`
+	Stage      string     `gorm:"size:64" json:"stage"`
+	SourcePath string     `gorm:"size:2048" json:"source_path"`
+	DestPath   string     `gorm:"size:2048" json:"dest_path"`
+	Message    string     `gorm:"type:text" json:"message"`
+	Error      string     `gorm:"type:text" json:"error"`
+	Details    string     `gorm:"type:text" json:"details"`
+	Metrics    string     `gorm:"type:text" json:"metrics"`
+	Items      string     `gorm:"type:text" json:"items"`
+	StartedAt  time.Time  `gorm:"index" json:"started_at"`
+	UpdatedAt  time.Time  `json:"updated_at"`
+	FinishedAt *time.Time `json:"finished_at,omitempty"`
+}
@@ -0,0 +1,81 @@
+// 115 云下载（离线下载）任务数据模型。
+//
+// 一条 CloudDownloadTask 表示用户提交的一个离线下载来源（磁力 / BT 种子 /
+// ed2k / HTTP），并记录它在「115 下载 → STRM 同步 → 媒体库扫描 → 刮削」
+// 链路上的位置。下载状态（Status）与后处理阶段（Stage）刻意分成两组字段：
+// STRM 同步或刮削失败不能把 115 侧的「已下载成功」改写掉，用户重做后处理时
+// 也不需要重新下载。
+package model
+
+import "time"
+
+// 云下载任务状态（115 离线下载侧）。
+const (
+	CloudDownloadQueued      = "queued"      // 本地已建行，尚未提交 115
+	CloudDownloadSubmitted   = "submitted"   // 115 已受理
+	CloudDownloadDownloading = "downloading" // 115 正在下载（status 0/1）
+	CloudDownloadSucceeded   = "succeeded"   // 115 下载完成（status 2）
+	CloudDownloadFailed      = "failed"      // 提交被拒 / status -1 / 超时
+	CloudDownloadCanceled    = "canceled"    // 用户取消
+)
+
+// 云下载后处理阶段（STRM 同步 → 扫描 → 刮削）。
+const (
+	CloudDownloadStagePending     = "pending"      // 尚未开始（下载未成功）
+	CloudDownloadStageWaitingSync = "waiting_sync" // 已成功，等待去抖窗口或等待目录空闲
+	CloudDownloadStageSyncing     = "syncing"      // STRM 增量同步中
+	CloudDownloadStageScanning    = "scanning"     // 媒体库扫描中
+	CloudDownloadStageScraping    = "scraping"     // 刮削已入队
+	CloudDownloadStageDone        = "done"         // 全链路完成
+	CloudDownloadStageNA          = "na"           // 无法继续（同步目录/媒体库不存在），不算失败
+	CloudDownloadStageFailed      = "failed"       // 阶段失败，可用「重做后处理」重试
+)
+
+// 云下载来源类型。
+const (
+	CloudDownloadSourceMagnet  = "magnet"
+	CloudDownloadSourceTorrent = "torrent"
+	CloudDownloadSourceED2K    = "ed2k"
+	CloudDownloadSourceHTTP    = "http"
+	CloudDownloadSourceFTP     = "ftp"
+)
+
+// CloudDownloadTask 是一条云下载任务。
+type CloudDownloadTask struct {
+	Base
+
+	AccountID  string `gorm:"size:36;index" json:"account_id"`   // 115 网盘账号（model.StrmAccount）
+	SyncPathID string `gorm:"size:36;index" json:"sync_path_id"` // 绑定的 STRM 同步目录
+	LibraryID  string `gorm:"size:36;index" json:"library_id"`   // 由本地目录反查得到，可为空
+	Provider   string `gorm:"size:32" json:"provider"`           // 固定 cloud115
+
+	SourceType string `gorm:"size:16;index" json:"source_type"` // CloudDownloadSource*
+	SourceURL  string `gorm:"type:text" json:"source_url"`      // 原始链接；.torrent 时存上传的文件名
+	// SourceKey 是轮询匹配用的归一化键：BT 类任务存大写 info_hash，链接类任务
+	// 存 trim 后的 url。提交时即写入，避免每轮重新计算。
+	SourceKey string `gorm:"size:512;index" json:"source_key"`
+	InfoHash  string `gorm:"size:64;index" json:"info_hash,omitempty"`
+
+	TorrentName string `gorm:"size:512" json:"torrent_name,omitempty"`
+	TorrentSha1 string `gorm:"size:64" json:"torrent_sha1,omitempty"` // .torrent 提交路径用
+	PickCode    string `gorm:"size:128" json:"pick_code,omitempty"`   // .torrent 提交路径用
+
+	WpPathID string `gorm:"size:64" json:"wp_path_id"`           // 115 目标目录 ID（= syncPath.RemotePath）
+	SavePath string `gorm:"size:512" json:"save_path,omitempty"` // 相对 wp_path_id 的子路径（预留）
+
+	Status    string `gorm:"size:16;index" json:"status"` // CloudDownload*
+	Percent   int    `json:"percent"`
+	SizeBytes int64  `json:"size_bytes"`
+	Error     string `gorm:"size:1024" json:"error"`
+
+	Stage        string `gorm:"size:16;index" json:"stage"` // CloudDownloadStage*
+	StageError   string `gorm:"size:1024" json:"stage_error"`
+	StrmRecordID string `gorm:"size:36" json:"strm_record_id,omitempty"`
+	ScanAdded    int    `json:"scan_added"`
+	ScrapeQueued int    `json:"scrape_queued"`
+
+	RetryCount  int        `json:"retry_count"`
+	LastPollAt  *time.Time `json:"last_poll_at,omitempty"`
+	NextPollAt  *time.Time `gorm:"index" json:"next_poll_at,omitempty"`
+	CompletedAt *time.Time `json:"completed_at,omitempty"`
+}
@@ -1,5 +1,7 @@
 package model

+import "time"
+
 // Library 表示一个逻辑媒体库。Path 保留为兼容字段，指向第一条 LibraryRoot。
 type Library struct {
 	Base
@@ -26,12 +28,15 @@ type LibraryRoot struct {
 // Media 是单个可播放项。剧集链接到 SeriesID；电影 SeriesID == ""。
 type Media struct {
 	Base
-	LibraryID     string `gorm:"index;size:36;index:idx_media_library_release,priority:1" json:"library_id"`
-	LibraryRootID string `gorm:"index;size:36" json:"library_root_id,omitempty"`
-	SeriesID      string `gorm:"index;size:128" json:"series_id,omitempty"`
-	Title         string `gorm:"size:255;not null" json:"title"`
-	OriginalName  string `gorm:"size:255" json:"original_name,omitempty"`
-	EpisodeTitle  string `gorm:"size:255" json:"episode_title,omitempty"`
+	AvailabilityState string     `gorm:"index;size:16;not null;default:available" json:"availability_state"`
+	MissingSince      *time.Time `json:"missing_since,omitempty"`
+	LastSeenAt        *time.Time `json:"last_seen_at,omitempty"`
+	LibraryID         string     `gorm:"index;size:36;index:idx_media_library_release,priority:1" json:"library_id"`
+	LibraryRootID     string     `gorm:"index;size:36" json:"library_root_id,omitempty"`
+	SeriesID          string     `gorm:"index;size:128" json:"series_id,omitempty"`
+	Title             string     `gorm:"size:255;not null" json:"title"`
+	OriginalName      string     `gorm:"size:255" json:"original_name,omitempty"`
+	EpisodeTitle      string     `gorm:"size:255" json:"episode_title,omitempty"`
 	// Path 的唯一性由 database 包按方言显式建索引，这里刻意不用 uniqueIndex：
 	// PostgreSQL 的 btree 单条索引项上限 2704 字节，而 varchar(1024) 在中文路径
 	// 下可达 3072 字节，直接对整列建唯一索引会让长路径的扫描插入直接失败
@@ -60,7 +60,9 @@ func AllModels() []interface{} {
 		&StrmDownloadTask{},
 		&StrmUploadTask{},
 		&StrmDirCache{},
+		&CloudDownloadTask{},
 		&ScrapeTask{},
+		&BackgroundTaskRecord{},
 		&EmbyMount{},
 		&ReaderBookSource{},
 		&ReaderSourceState{},
@@ -38,6 +38,12 @@ type ReaderBookSource struct {
 	// NeedsBrowser 是否依赖 WebView/无头浏览器（webView 选项或 webjs 规则）。
 	// 服务端没有浏览器，这类源注定不可用，列表接口按需计算让前端能提前提示。
 	NeedsBrowser bool `gorm:"-" json:"needs_browser"`
+	// MediaDirect 允许客户端直连上游取实体媒体（音频/漫画图片），服务端只负责
+	// 解析地址与下发所需请求头。
+	//
+	// 只在客户端显式请求直连时生效（见 ContentOptions）：网页端不声明该能力，
+	// 行为与开启此字段前完全一致。
+	MediaDirect bool `gorm:"default:false" json:"media_direct"`
 }

 // ReaderSourceState 书源会话状态：对应 legado 中按书源 key 存储的
@@ -0,0 +1,241 @@
+package repository
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"gorm.io/gorm"
+
+	"github.com/truewhile/MeBox/internal/model"
+)
+
+// CloudDownloadRepository persists model.CloudDownloadTask（115 云下载任务）。
+type CloudDownloadRepository struct{ db *gorm.DB }
+
+// CloudDownloadQuery 是任务列表的过滤条件。
+type CloudDownloadQuery struct {
+	Status     string // 精确匹配；空表示全部
+	SyncPathID string
+	AccountID  string
+	Page       int
+	PageSize   int
+}
+
+// Create 插入一条云下载任务。
+func (r *CloudDownloadRepository) Create(ctx context.Context, t *model.CloudDownloadTask) error {
+	return withSQLiteBusyRetry(ctx, func() error {
+		return r.db.WithContext(ctx).Create(t).Error
+	})
+}
+
+// Update 更新任务的可变字段（不含主键与创建时间）。
+func (r *CloudDownloadRepository) Update(ctx context.Context, t *model.CloudDownloadTask) error {
+	return r.UpdateFields(ctx, t.ID, map[string]any{
+		"account_id":     t.AccountID,
+		"sync_path_id":   t.SyncPathID,
+		"library_id":     t.LibraryID,
+		"provider":       t.Provider,
+		"source_type":    t.SourceType,
+		"source_url":     t.SourceURL,
+		"source_key":     t.SourceKey,
+		"info_hash":      t.InfoHash,
+		"torrent_name":   t.TorrentName,
+		"torrent_sha1":   t.TorrentSha1,
+		"pick_code":      t.PickCode,
+		"wp_path_id":     t.WpPathID,
+		"save_path":      t.SavePath,
+		"status":         t.Status,
+		"percent":        t.Percent,
+		"size_bytes":     t.SizeBytes,
+		"error":          t.Error,
+		"stage":          t.Stage,
+		"stage_error":    t.StageError,
+		"strm_record_id": t.StrmRecordID,
+		"scan_added":     t.ScanAdded,
+		"scrape_queued":  t.ScrapeQueued,
+		"retry_count":    t.RetryCount,
+		"last_poll_at":   t.LastPollAt,
+		"next_poll_at":   t.NextPollAt,
+		"completed_at":   t.CompletedAt,
+	})
+}
+
+// UpdateFields 局部更新：调用方只写自己关心的列，避免覆盖并发写入的其它阶段字段
+// （轮询线程写 Status，后处理线程写 Stage，两者必须互不覆盖）。
+func (r *CloudDownloadRepository) UpdateFields(ctx context.Context, id string, fields map[string]any) error {
+	if id == "" || len(fields) == 0 {
+		return nil
+	}
+	fields["updated_at"] = time.Now()
+	return withSQLiteBusyRetry(ctx, func() error {
+		return r.db.WithContext(ctx).Model(&model.CloudDownloadTask{}).Where("id = ?", id).Updates(fields).Error
+	})
+}
+
+// FindByID 按主键查询，未找到返回 (nil, nil)。
+func (r *CloudDownloadRepository) FindByID(ctx context.Context, id string) (*model.CloudDownloadTask, error) {
+	var t model.CloudDownloadTask
+	err := r.db.WithContext(ctx).Where("id = ?", id).First(&t).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &t, nil
+}
+
+// List 分页查询任务列表，同时返回总数。
+func (r *CloudDownloadRepository) List(ctx context.Context, q CloudDownloadQuery) ([]model.CloudDownloadTask, int64, error) {
+	db := r.db.WithContext(ctx).Model(&model.CloudDownloadTask{})
+	if q.Status != "" {
+		db = db.Where("status = ?", q.Status)
+	}
+	if q.SyncPathID != "" {
+		db = db.Where("sync_path_id = ?", q.SyncPathID)
+	}
+	if q.AccountID != "" {
+		db = db.Where("account_id = ?", q.AccountID)
+	}
+	var total int64
+	if err := db.Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+	page := q.Page
+	if page < 1 {
+		page = 1
+	}
+	size := q.PageSize
+	if size <= 0 {
+		size = 20
+	}
+	if size > 200 {
+		size = 200
+	}
+	var rows []model.CloudDownloadTask
+	err := db.Order("created_at desc").
+		Offset((page - 1) * size).
+		Limit(size).
+		Find(&rows).Error
+	return rows, total, err
+}
+
+// ListByStatuses 取指定状态的任务（轮询用）。
+func (r *CloudDownloadRepository) ListByStatuses(ctx context.Context, statuses []string) ([]model.CloudDownloadTask, error) {
+	if len(statuses) == 0 {
+		return nil, nil
+	}
+	var rows []model.CloudDownloadTask
+	err := r.db.WithContext(ctx).
+		Where("status IN ?", statuses).
+		Order("created_at asc").
+		Find(&rows).Error
+	return rows, err
+}
+
+// ListBySyncPathAndStage 取某个同步目录下处于指定阶段的任务（后处理推进用）。
+func (r *CloudDownloadRepository) ListBySyncPathAndStage(ctx context.Context, syncPathID, stage string) ([]model.CloudDownloadTask, error) {
+	var rows []model.CloudDownloadTask
+	err := r.db.WithContext(ctx).
+		Where("sync_path_id = ? AND stage = ?", syncPathID, stage).
+		Order("created_at asc").
+		Find(&rows).Error
+	return rows, err
+}
+
+// ListPipelineCandidates 取「下载已成功、后处理尚未完成」的任务。
+func (r *CloudDownloadRepository) ListPipelineCandidates(ctx context.Context) ([]model.CloudDownloadTask, error) {
+	var rows []model.CloudDownloadTask
+	err := r.db.WithContext(ctx).
+		Where("status = ? AND stage IN ?", model.CloudDownloadSucceeded,
+			[]string{model.CloudDownloadStagePending, model.CloudDownloadStageWaitingSync}).
+		Order("created_at asc").
+		Find(&rows).Error
+	return rows, err
+}
+
+// ResetStaleStages 把上次进程退出时停在中间阶段的任务重置为待推进。
+// STRM 同步/扫描/刮削都是幂等操作，重启后重新推进是安全的。
+func (r *CloudDownloadRepository) ResetStaleStages(ctx context.Context) (int64, error) {
+	var affected int64
+	err := withSQLiteBusyRetry(ctx, func() error {
+		res := r.db.WithContext(ctx).Model(&model.CloudDownloadTask{}).
+			Where("stage IN ?", []string{
+				model.CloudDownloadStageSyncing,
+				model.CloudDownloadStageScanning,
+				model.CloudDownloadStageScraping,
+			}).
+			Updates(map[string]any{
+				"stage":       model.CloudDownloadStagePending,
+				"stage_error": "",
+				"updated_at":  time.Now(),
+			})
+		affected = res.RowsAffected
+		return res.Error
+	})
+	return affected, err
+}
+
+// FindActiveBySourceKeys 返回给定匹配键中仍处于活跃状态的任务键集合。
+// 用于提交时去重：同一个磁力重复提交只会浪费 115 配额。
+func (r *CloudDownloadRepository) FindActiveBySourceKeys(ctx context.Context, keys []string) (map[string]bool, error) {
+	out := make(map[string]bool, len(keys))
+	if len(keys) == 0 {
+		return out, nil
+	}
+	var found []string
+	err := r.db.WithContext(ctx).Model(&model.CloudDownloadTask{}).
+		Where("source_key IN ?", keys).
+		Where("status IN ?", []string{
+			model.CloudDownloadQueued,
+			model.CloudDownloadSubmitted,
+			model.CloudDownloadDownloading,
+		}).
+		Pluck("source_key", &found).Error
+	if err != nil {
+		return out, err
+	}
+	for _, k := range found {
+		out[k] = true
+	}
+	return out, nil
+}
+
+// Delete 硬删除一条任务记录。
+func (r *CloudDownloadRepository) Delete(ctx context.Context, id string) error {
+	return withSQLiteBusyRetry(ctx, func() error {
+		return r.db.WithContext(ctx).Unscoped().Where("id = ?", id).Delete(&model.CloudDownloadTask{}).Error
+	})
+}
+
+// ClearFinished 删除所有「无后续价值」的终态任务（失败/已取消）。
+// 成功的任务保留：它们承载「本地已生成 strm / 已刮削」的证据，供用户回查。
+func (r *CloudDownloadRepository) ClearFinished(ctx context.Context) (int64, error) {
+	var affected int64
+	err := withSQLiteBusyRetry(ctx, func() error {
+		res := r.db.WithContext(ctx).Unscoped().
+			Where("status IN ?", []string{
+				model.CloudDownloadFailed,
+				model.CloudDownloadCanceled,
+			}).
+			Delete(&model.CloudDownloadTask{})
+		affected = res.RowsAffected
+		return res.Error
+	})
+	return affected, err
+}
+
+// CountBySyncPath 统计某同步目录下仍在活跃的任务数（前端展示用）。
+func (r *CloudDownloadRepository) CountBySyncPath(ctx context.Context, syncPathID string) (int64, error) {
+	var n int64
+	err := r.db.WithContext(ctx).Model(&model.CloudDownloadTask{}).
+		Where("sync_path_id = ?", syncPathID).
+		Where("status IN ?", []string{
+			model.CloudDownloadQueued,
+			model.CloudDownloadSubmitted,
+			model.CloudDownloadDownloading,
+		}).
+		Count(&n).Error
+	return n, err
+}
@@ -123,6 +123,20 @@ func (r *LibraryRepository) ListRoots(ctx context.Context, libraryID string) ([]
 	return roots, err
 }

+// ListEnabledRoots 返回全部已启用媒体库的全部启用路径。
+// 用于「本地目录 → 媒体库」的反查（云下载完成后只扫相关库，而不是全库重扫）。
+func (r *LibraryRepository) ListEnabledRoots(ctx context.Context) ([]model.LibraryRoot, error) {
+	if !r.hasLibraryRootsTable() {
+		return nil, nil
+	}
+	var roots []model.LibraryRoot
+	err := r.db.WithContext(ctx).
+		Where("enabled = ?", true).
+		Order("sort_order asc, created_at asc").
+		Find(&roots).Error
+	return roots, err
+}
+
 func (r *LibraryRepository) FindRootByID(ctx context.Context, libraryID, rootID string) (*model.LibraryRoot, error) {
 	if !r.hasLibraryRootsTable() {
 		return nil, nil
@@ -237,10 +237,16 @@ func (r *MediaRepository) ListSeasonSiblings(ctx context.Context, m *model.Media
 	} else {
 		libraryID := strings.TrimSpace(m.LibraryID)
 		title := strings.TrimSpace(m.Title)
-		if libraryID == "" || title == "" || m.TMDbID <= 0 {
+		if libraryID == "" || title == "" {
 			return nil, nil
 		}
-		query = query.Where("library_id = ? AND title = ? AND tm_db_id = ?", libraryID, title, m.TMDbID)
+		// 没有 series_id 也没有 TMDb id 时，退到「同库 + 同标题」：手动标记的按季
+		// 传播是用户显式操作，同库同名已经足够可靠；而在缺 id 时直接放弃会让这个
+		// 功能在未刮削的库上完全不生效。
+		query = query.Where("library_id = ? AND title = ?", libraryID, title)
+		if m.TMDbID > 0 {
+			query = query.Where("tm_db_id = ?", m.TMDbID)
+		}
 	}
 	var rows []model.Media
 	if err := query.Find(&rows).Error; err != nil {
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"path/filepath"
 	"strings"
+	"time"

 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
@@ -163,6 +164,12 @@ func (r *MediaRepository) upsertWithDB(ctx context.Context, db *gorm.DB, m *mode
 		existing.Path = m.Path
 		existing.DeletedAt = gorm.DeletedAt{}
 	}
+	if _, ok := updates["availability_state"]; ok {
+		existing.AvailabilityState = "available"
+		existing.MissingSince = nil
+		now := updates["last_seen_at"].(time.Time)
+		existing.LastSeenAt = &now
+	}
 	*m = existing
 	return existing.ID, nil
 }
@@ -216,6 +223,10 @@ func (r *MediaRepository) findOrCreateMediaByPath(ctx context.Context, db *gorm.
 		if m.ScrapeStatus == "" {
 			m.ScrapeStatus = "pending"
 		}
+		now := time.Now()
+		m.AvailabilityState = "available"
+		m.MissingSince = nil
+		m.LastSeenAt = &now
 		// PostgreSQL 唯一键异常会中止整个事务，之后重查也会失败。
 		// DO NOTHING 保持事务可用，并兼容 path 的表达式唯一索引。
 		result := db.WithContext(ctx).Clauses(clause.OnConflict{DoNothing: true}).Create(m)
@@ -265,6 +276,11 @@ func (r *MediaRepository) findMediaByAlias(ctx context.Context, db *gorm.DB, cur

 func mediaUpsertUpdates(existing, incoming model.Media, reclaimLibrary bool) map[string]any {
 	updates := map[string]any{}
+	if existing.AvailabilityState != "available" || existing.MissingSince != nil {
+		updates["availability_state"] = "available"
+		updates["missing_since"] = nil
+		updates["last_seen_at"] = time.Now()
+	}
 	addMediaFileScanUpdates(updates, existing, incoming)
 	addMediaTitleUpdates(updates, existing, incoming)
 	addMediaExternalIDUpdates(updates, existing, incoming)
@@ -56,6 +56,23 @@ func (r *MediaSegmentRepository) ReplaceForMedia(ctx context.Context, mediaID, s
 	})
 }

+// ReplaceForMediaSourceKind swaps the segments of one (media, source, kind)
+// triple in a single transaction. Used by manual marking, where the user sets
+// one boundary at a time and must not disturb the other kinds.
+func (r *MediaSegmentRepository) ReplaceForMediaSourceKind(ctx context.Context, mediaID, source, kind string, rows []model.MediaSegment) error {
+	return r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		if err := tx.Unscoped().
+			Where("media_id = ? AND source = ? AND kind = ?", mediaID, source, kind).
+			Delete(&model.MediaSegment{}).Error; err != nil {
+			return err
+		}
+		if len(rows) == 0 {
+			return nil
+		}
+		return tx.Create(&rows).Error
+	})
+}
+
 // GetFetch returns the fetch ledger row for (media, source), or (nil, nil).
 func (r *MediaSegmentRepository) GetFetch(ctx context.Context, mediaID, source string) (*model.MediaSegmentFetch, error) {
 	var row model.MediaSegmentFetch
@@ -35,6 +35,7 @@ type Container struct {
 	StrmDownload   *StrmDownloadTaskRepository
 	StrmUpload     *StrmUploadTaskRepository
 	StrmDirCache   *StrmDirCacheRepository
+	CloudDownload  *CloudDownloadRepository
 	ScrapeTask     *ScrapeTaskRepository
 	EmbyMount      *EmbyMountRepository
 	Reader         *ReaderRepository
@@ -69,6 +70,7 @@ func New(db *gorm.DB) *Container {
 		StrmDownload:   &StrmDownloadTaskRepository{db: db},
 		StrmUpload:     &StrmUploadTaskRepository{db: db},
 		StrmDirCache:   &StrmDirCacheRepository{db: db},
+		CloudDownload:  &CloudDownloadRepository{db: db},
 		ScrapeTask:     &ScrapeTaskRepository{db: db},
 		EmbyMount:      &EmbyMountRepository{db: db},
 		Reader:         &ReaderRepository{db: db},
@@ -8,6 +8,7 @@ import (
 	_ "image/png" // register PNG decoder
 	"strings"

+	"github.com/metatube-community/metatube-sdk-go/common/number"
 	"github.com/metatube-community/metatube-sdk-go/detector"
 	_ "golang.org/x/image/webp" // register WebP decoder for AVE covers
 )
@@ -46,32 +47,50 @@ func IsAdultArtworkURL(raw string) bool {
 		strings.Contains(lower, "pics.dmm.co.jp")
 }

-// CropAdultCoverPoster checks if the image data is a wide full-jacket DVD cover (width > height * 1.15).
-// If so, it uses MetaTube's Pigo face detector to position a 2:3 poster crop.
-// When no face is detected, it falls back to the conventional right-side front cover.
+// CropAdultCoverPoster checks if the image data is a wide full-jacket DVD cover (width > height * 1.15)
+// and crops the conventional right-side front cover out of it. It is the code-agnostic entry point;
+// prefer CropAdultCoverPosterForCode when the movie number is known.
 // If the image is already portrait or cannot be decoded, it safely returns the original data.
 func CropAdultCoverPoster(data []byte) ([]byte, string, error) {
+	return CropAdultCoverPosterForCode(data, "")
+}
+
+// CropAdultCoverPosterForCode crops a 2:3 poster out of a wide full-jacket DVD cover.
+//
+// Layout matters: a regular DVD jacket is [封底 | 书脊 | 封面] unfolded right-to-left, so the
+// front cover is always the right-most panel — exactly what upstream MetaTube does with its
+// default position 1.0. Face detection is only meaningful for "special" numbers
+// (FC2 / HEYZO / 素人 / 无码) whose cover is a snapshot whose composition varies
+// (see metatube-sdk-go/common/number.RequiresFaceDetection).
+//
+// Running the detector on a regular jacket is actively harmful: the back cover of those jackets is a
+// montage of sample stills that is packed with faces, so the dominant face cluster lands on the montage
+// (or right on the spine), and a crop centred there straddles the seam giving "half back cover + half
+// front cover" posters.
+func CropAdultCoverPosterForCode(data []byte, code string) ([]byte, string, error) {
 	if len(data) == 0 {
 		return data, "", nil
 	}
 	src, format, err := image.Decode(bytes.NewReader(data))
 	if err != nil {
-		return data, format, err
+		return data, imageMIMEForFormat(format), err
 	}
 	bounds := src.Bounds()
 	width := bounds.Dx()
 	height := bounds.Dy()
 	if width <= 0 || height <= 0 {
-		return data, format, nil
+		return data, imageMIMEForFormat(format), nil
 	}
 	// If the image is already portrait or square, keep it as-is.
 	if float64(width) <= float64(height)*1.15 {
-		return data, format, nil
+		return data, imageMIMEForFormat(format), nil
 	}

 	position := 1.0
-	if detected, ok := findPrimaryFaceAxisRatio(src, adultPosterRatio, true); ok {
-		position = detected
+	if adultCoverNeedsFaceDetection(code) {
+		if detected, ok := findPrimaryFaceAxisRatio(src, adultPosterRatio, true); ok {
+			position = snapAdultCoverPosition(detected)
+		}
 	}
 	cropped := cropImageAtPosition(src, adultPosterRatio, position)

@@ -82,6 +101,48 @@ func CropAdultCoverPoster(data []byte) ([]byte, string, error) {
 	return buf.Bytes(), "image/jpeg", nil
 }

+// imageMIMEForFormat maps the format name returned by image.Decode ("jpeg" / "png" / "webp" …) to a MIME
+// type. The sidecar extension is derived from the MIME type, so handing back the bare format name made
+// every already-portrait poster fall through to the legacy ".img" extension.
+func imageMIMEForFormat(format string) string {
+	switch strings.ToLower(strings.TrimSpace(format)) {
+	case "jpeg", "jpg":
+		return "image/jpeg"
+	case "png":
+		return "image/png"
+	case "webp":
+		return "image/webp"
+	case "gif":
+		return "image/gif"
+	case "avif":
+		return "image/avif"
+	default:
+		return ""
+	}
+}
+
+// adultCoverNeedsFaceDetection reports whether the cover composition has to be probed with the face
+// detector, mirroring upstream MetaTube: only "special" numbers (FC2 / HEYZO / 素人 / 无码) qualify,
+// regular DVD numbers are always cropped at the right-most panel.
+func adultCoverNeedsFaceDetection(code string) bool {
+	code = strings.TrimSpace(code)
+	if code == "" {
+		return false
+	}
+	return number.RequiresFaceDetection(code)
+}
+
+// snapAdultCoverPosition quantises a detected face axis onto a whole panel. A wide jacket only has two
+// legal framings — the left panel or the right panel — so the crop window must never be centred on the
+// detected axis itself: when that axis sits on/near the spine the result is a poster showing the right
+// half of the back cover plus the left sliver of the front cover.
+func snapAdultCoverPosition(position float64) float64 {
+	if position >= 0.5 {
+		return 1.0 // right panel: flush with the right edge
+	}
+	return 0.0 // left panel: flush with the left edge
+}
+
 func cropImageAtPosition(src image.Image, ratio, position float64) image.Image {
 	bounds := src.Bounds()
 	width := bounds.Dx()
@@ -80,7 +80,7 @@ func TestCropAdultCoverPosterDecodesWebP(t *testing.T) {
 	}
 }

-func TestCropAdultCoverPosterCentersDetectedFace(t *testing.T) {
+func TestCropAdultCoverPosterUsesDetectedPanelForSpecialNumber(t *testing.T) {
 	originalDetector := findPrimaryFaceAxisRatio
 	findPrimaryFaceAxisRatio = func(image.Image, float64, bool) (float64, bool) {
 		return 0.25, true
@@ -90,7 +90,8 @@ func TestCropAdultCoverPosterCentersDetectedFace(t *testing.T) {
 	}()

 	origBytes := createTestImage(900, 600, color.RGBA{R: 255, A: 255}, color.RGBA{B: 255, A: 255})
-	croppedBytes, _, err := CropAdultCoverPoster(origBytes)
+	// 素人/FC2 这类番号构图不固定，允许人脸检测决定取哪一侧面板。
+	croppedBytes, _, err := CropAdultCoverPosterForCode(origBytes, "FC2-PPV-123456")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -100,7 +101,65 @@ func TestCropAdultCoverPosterCentersDetectedFace(t *testing.T) {
 	}
 	r, _, b, _ := croppedImg.At(croppedImg.Bounds().Dx()/2, croppedImg.Bounds().Dy()/2).RGBA()
 	if r <= b {
-		t.Fatalf("face-positioned crop did not follow detected left-side axis: r=%d b=%d", r, b)
+		t.Fatalf("special-number crop did not follow detected left-side axis: r=%d b=%d", r, b)
+	}
+}
+
+// 常规 DVD 番号的封套是 [封底 | 书脊 | 封面] 横图，封底那半张是样本剧照拼贴、充满人脸。
+// 做人脸检测会让主簇落在拼贴或书脊上，裁出「半张封底 + 半张封面」。
+// 这里模拟检测器给出跨缝的 0.42，要求常规番号完全忽略检测结果，只裁最右侧封面面板。
+func TestCropAdultCoverPosterIgnoresFaceDetectionForStandardNumber(t *testing.T) {
+	originalDetector := findPrimaryFaceAxisRatio
+	findPrimaryFaceAxisRatio = func(image.Image, float64, bool) (float64, bool) {
+		return 0.42, true
+	}
+	defer func() {
+		findPrimaryFaceAxisRatio = originalDetector
+	}()
+
+	origBytes := createTestImage(900, 600, color.RGBA{R: 255, A: 255}, color.RGBA{B: 255, A: 255})
+	croppedBytes, _, err := CropAdultCoverPosterForCode(origBytes, "SSNI-677")
+	if err != nil {
+		t.Fatal(err)
+	}
+	croppedImg, _, err := image.Decode(bytes.NewReader(croppedBytes))
+	if err != nil {
+		t.Fatal(err)
+	}
+	r, _, b, _ := croppedImg.At(croppedImg.Bounds().Dx()/2, croppedImg.Bounds().Dy()/2).RGBA()
+	if b <= r {
+		t.Fatalf("standard-number crop should be the right-most panel (blue), got r=%d b=%d", r, b)
+	}
+}
+
+// 即使需要人脸定位，裁切框也必须吸附到整块面板，绝不能跨在书脊上。
+func TestCropAdultCoverPosterSnapsToPanelForSpecialNumber(t *testing.T) {
+	originalDetector := findPrimaryFaceAxisRatio
+	findPrimaryFaceAxisRatio = func(image.Image, float64, bool) (float64, bool) {
+		return 0.42, true // 介于两个面板之间：落在书脊上
+	}
+	defer func() {
+		findPrimaryFaceAxisRatio = originalDetector
+	}()
+
+	origBytes := createTestImage(900, 600, color.RGBA{R: 255, A: 255}, color.RGBA{B: 255, A: 255})
+	croppedBytes, _, err := CropAdultCoverPosterForCode(origBytes, "HEYZO-1234")
+	if err != nil {
+		t.Fatal(err)
+	}
+	croppedImg, _, err := image.Decode(bytes.NewReader(croppedBytes))
+	if err != nil {
+		t.Fatal(err)
+	}
+	bounds := croppedImg.Bounds()
+	// 左侧面板 = 纯红；任何偏蓝像素都意味着裁切框越过了中线。
+	for y := bounds.Min.Y; y < bounds.Max.Y; y += 8 {
+		for x := bounds.Min.X; x < bounds.Max.X; x += 8 {
+			r, _, b, _ := croppedImg.At(x, y).RGBA()
+			if b > r {
+				t.Fatalf("crop straddles the panel seam at (%d,%d): r=%d b=%d", x, y, r, b)
+			}
+		}
 	}
 }

@@ -108,10 +167,14 @@ func TestCropAdultCoverPosterKeepsPortrait(t *testing.T) {
 	// Create an already vertical portrait image (500x700)
 	origBytes := createTestImage(500, 700, color.RGBA{R: 255, A: 255}, color.RGBA{B: 255, A: 255})

-	croppedBytes, _, err := CropAdultCoverPoster(origBytes)
+	croppedBytes, ctype, err := CropAdultCoverPoster(origBytes)
 	if err != nil {
 		t.Fatalf("CropAdultCoverPoster error: %v", err)
 	}
+	// 未裁剪时必须回传真正的 MIME（image/jpeg），否则侧车文件扩展名会退化成 .img。
+	if ctype != "image/jpeg" {
+		t.Fatalf("portrait ctype = %q, want image/jpeg", ctype)
+	}

 	croppedImg, _, err := image.Decode(bytes.NewReader(croppedBytes))
 	if err != nil {
@@ -96,7 +96,8 @@ func TestAdultProviderRouting(t *testing.T) {
 	if len(candidates) != 1 {
 		t.Fatalf("expected 1 candidate, got %d", len(candidates))
 	}
-	wantPoster := mtServer.URL + "/v1/images/primary/javdb/999?auto=true&pos=1&quality=90&ratio=-1&url=https%3A%2F%2Fexample.com%2Fposter.jpg"
+	// SSIS-001 是常规番号：MetaTube 代理不得开启人脸定位，固定取最右侧封面面板。
+	wantPoster := mtServer.URL + "/v1/images/primary/javdb/999?auto=false&pos=1&quality=90&ratio=-1&url=https%3A%2F%2Fexample.com%2Fposter.jpg"
 	wantBackdrop := mtServer.URL + "/v1/images/backdrop/javdb/999?quality=90"
 	if candidates[0].PosterURL != wantPoster || candidates[0].BackdropURL != wantBackdrop {
 		t.Fatalf("candidate artwork was not enriched: %#v", candidates[0])
@@ -170,8 +171,8 @@ func TestBuiltinAdultScrapeUsesMetaTubeFaceAwareArtwork(t *testing.T) {
 	if match == nil {
 		t.Fatal("expected built-in match")
 	}
-	wantPoster := metaTubeServer.URL + "/v1/images/primary/AVE/999?auto=true&pos=1&quality=90&ratio=-1&url=https%3A%2F%2Fexample.com%2Fwide-cover.jpg"
+	wantPoster := metaTubeServer.URL + "/v1/images/primary/AVE/999?auto=false&pos=1&quality=90&ratio=-1&url=https%3A%2F%2Fexample.com%2Fwide-cover.jpg"
 	if match.PosterURL != wantPoster {
-		t.Fatalf("built-in poster = %q, want face-aware URL %q", match.PosterURL, wantPoster)
+		t.Fatalf("built-in poster = %q, want MetaTube-processed URL %q", match.PosterURL, wantPoster)
 	}
 }
@@ -24,6 +24,14 @@ func (s *ApiConfigService) TestConnection(ctx context.Context, provider string)
 	switch provider {
 	case "tmdb":
 		return s.testTMDb(cfg)
+	case "bangumi":
+		return s.testBangumi(ctx, cfg)
+	case "thetvdb":
+		return s.testTheTVDB(ctx, cfg)
+	case "fanart":
+		return s.testFanart(ctx, cfg)
+	case "douban":
+		return s.testDouban(ctx, cfg)
 	case "openai":
 		return s.testOpenAI(cfg)
 	case "deepseek":
@@ -0,0 +1,191 @@
+package service
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/truewhile/MeBox/internal/model"
+)
+
+// Bangumi's public metadata endpoints work without a token. If one was saved,
+// also check /v0/me: public endpoints alone may accept an expired token.
+func (s *ApiConfigService) testBangumi(ctx context.Context, cfg *model.APIConfig) (string, error) {
+	req, err := newMetadataProbeRequest(ctx, cfg, "https://api.bgm.tv", "/v0/subjects/253", http.MethodGet, nil)
+	if err != nil {
+		return "error", err
+	}
+	if token := strings.TrimSpace(cfg.APIKey); token != "" {
+		req.Header.Set("Authorization", "Bearer "+token)
+		identityReq := req.Clone(ctx)
+		identityURL := *req.URL
+		identityURL.Path = strings.TrimSuffix(identityURL.Path, "/subjects/253") + "/me"
+		identityReq.URL = &identityURL
+		var identity struct {
+			ID int `json:"id"`
+		}
+		if result, err := testMetadataProbeJSON(identityReq, "Bangumi", &identity); err != nil {
+			return result, err
+		}
+		if identity.ID <= 0 {
+			return "error", errors.New("Bangumi returned an invalid user response")
+		}
+	}
+	var subject struct {
+		ID   int    `json:"id"`
+		Name string `json:"name"`
+	}
+	if result, err := testMetadataProbeJSON(req, "Bangumi", &subject); err != nil {
+		return result, err
+	}
+	if subject.ID != 253 || strings.TrimSpace(subject.Name) == "" {
+		return "error", errors.New("Bangumi returned an invalid subject response")
+	}
+	return "success", nil
+}
+
+func (s *ApiConfigService) testTheTVDB(ctx context.Context, cfg *model.APIConfig) (string, error) {
+	key := strings.TrimSpace(cfg.APIKey)
+	if key == "" {
+		return "error", errors.New("TheTVDB API key is required")
+	}
+	body, err := json.Marshal(map[string]string{"apikey": key})
+	if err != nil {
+		return "error", err
+	}
+	req, err := newMetadataProbeRequest(ctx, cfg, "https://api4.thetvdb.com/v4", "/login", http.MethodPost, strings.NewReader(string(body)))
+	if err != nil {
+		return "error", err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	var response struct {
+		Status string `json:"status"`
+		Data   struct {
+			Token string `json:"token"`
+		} `json:"data"`
+	}
+	if result, err := testMetadataProbeJSON(req, "TheTVDB", &response); err != nil {
+		return result, err
+	}
+	if response.Status != "success" || strings.TrimSpace(response.Data.Token) == "" {
+		return "error", errors.New("TheTVDB login did not return a valid token")
+	}
+	return "success", nil
+}
+
+func (s *ApiConfigService) testFanart(ctx context.Context, cfg *model.APIConfig) (string, error) {
+	key := strings.TrimSpace(cfg.APIKey)
+	if key == "" {
+		return "error", errors.New("Fanart API key is required")
+	}
+	req, err := newMetadataProbeRequest(ctx, cfg, "https://webservice.fanart.tv/v3", "/movies/550", http.MethodGet, nil)
+	if err != nil {
+		return "error", err
+	}
+	query := req.URL.Query()
+	query.Set("api_key", key)
+	req.URL.RawQuery = query.Encode()
+	var response struct {
+		TMDbID json.Number `json:"tmdb_id"`
+		Name   string      `json:"name"`
+	}
+	if result, err := testMetadataProbeJSON(req, "Fanart", &response); err != nil {
+		return result, err
+	}
+	if response.TMDbID.String() != "550" || strings.TrimSpace(response.Name) == "" {
+		return "error", errors.New("Fanart returned an invalid movie response")
+	}
+	return "success", nil
+}
+
+func (s *ApiConfigService) testDouban(ctx context.Context, cfg *model.APIConfig) (string, error) {
+	req, err := newMetadataProbeRequest(ctx, cfg, "https://movie.douban.com", "/j/subject_suggest", http.MethodGet, nil)
+	if err != nil {
+		return "error", err
+	}
+	query := req.URL.Query()
+	query.Set("q", "Inception")
+	req.URL.RawQuery = query.Encode()
+	req.Header.Set("User-Agent", userAgents[0])
+	req.Header.Set("Referer", "https://movie.douban.com/")
+	req.Header.Set("Accept-Language", "zh-CN,zh;q=0.9,en;q=0.8")
+	if cookie := strings.TrimSpace(cfg.APIKey); cookie != "" {
+		req.Header.Set("Cookie", cookie)
+	}
+	var suggestions []struct {
+		ID    string `json:"id"`
+		Title string `json:"title"`
+	}
+	if result, err := testMetadataProbeJSON(req, "Douban", &suggestions); err != nil {
+		return result, err
+	}
+	// An empty array is a valid search result; null or an error object is not.
+	if suggestions == nil {
+		return "error", errors.New("Douban returned an invalid search response (login or verification may be required)")
+	}
+	for _, suggestion := range suggestions {
+		if suggestion.ID == "" || strings.TrimSpace(suggestion.Title) == "" {
+			return "error", errors.New("Douban returned an invalid search suggestion")
+		}
+	}
+	return "success", nil
+}
+
+func newMetadataProbeRequest(ctx context.Context, cfg *model.APIConfig, defaultBase, path, method string, body io.Reader) (*http.Request, error) {
+	base := strings.TrimRight(strings.TrimSpace(cfg.BaseURL), "/")
+	if base == "" {
+		base = defaultBase
+	}
+	req, err := http.NewRequestWithContext(ctx, method, base+path, body)
+	if err != nil {
+		// The saved base URL may contain credentials. Never echo it to the UI.
+		return nil, fmt.Errorf("%s: invalid base URL", cfg.Provider)
+	}
+	req.Header.Set("User-Agent", "MeBox/0.1 (https://github.com/truewhile/MeBox)")
+	req.Header.Set("Accept", "application/json")
+	return req, nil
+}
+
+// Decode a bounded, complete JSON document rather than accepting any HTTP 200
+// (reverse proxies and anti-bot/login pages often return 200 as well).
+func testMetadataProbeJSON(req *http.Request, provider string, out any) (string, error) {
+	client := NewExternalHTTPClient(10 * time.Second)
+	defer client.CloseIdleConnections()
+	resp, err := client.Do(req)
+	if err != nil {
+		// url.Error includes the full request URL, including Fanart's API key.
+		var urlErr *url.Error
+		if errors.As(err, &urlErr) {
+			err = urlErr.Err
+		}
+		return "error", fmt.Errorf("%s connection failed: %w", provider, err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode == http.StatusUnauthorized {
+		return "invalid", fmt.Errorf("%s authentication failed (HTTP 401): check configured credentials", provider)
+	}
+	if resp.StatusCode == http.StatusForbidden {
+		return "error", fmt.Errorf("%s access denied (HTTP 403): check credentials, permissions or anti-bot verification", provider)
+	}
+	if resp.StatusCode != http.StatusOK {
+		return "error", fmt.Errorf("%s API returned status %d", provider, resp.StatusCode)
+	}
+	body, err := io.ReadAll(io.LimitReader(resp.Body, (1<<20)+1))
+	if err != nil {
+		return "error", fmt.Errorf("%s response read failed: %w", provider, err)
+	}
+	if len(body) > 1<<20 {
+		return "error", fmt.Errorf("%s response exceeds 1 MiB", provider)
+	}
+	if err := json.Unmarshal(body, out); err != nil {
+		// Do not include the response body: it may echo credentials.
+		return "error", fmt.Errorf("%s returned invalid JSON (login or verification page may have intercepted the request)", provider)
+	}
+	return "success", nil
+}
@@ -0,0 +1,252 @@
+package service
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/config"
+	"github.com/truewhile/MeBox/internal/repository"
+)
+
+type metadataProbeFixture struct {
+	provider string
+	path     string
+	key      string
+	body     string
+}
+
+var metadataProbeFixtures = []metadataProbeFixture{
+	{"bangumi", "/v0/subjects/253", "", `{"id":253,"name":"カウボーイビバップ","type":2}`},
+	{"thetvdb", "/login", "tvdb-test-secret", `{"status":"success","data":{"token":"test-jwt"}}`},
+	{"fanart", "/movies/550", "fanart+test&secret", `{"name":"Fight Club","tmdb_id":"550","imdb_id":"tt0137523","movieposter":[]}`},
+	{"douban", "/j/subject_suggest", "bid=test-cookie", `[{"id":"3541415","title":"盗梦空间","year":"2010","type":"movie"}]`},
+}
+
+func newMetadataConnectionTestService(t *testing.T) *ApiConfigService {
+	t.Helper()
+	log := zap.NewNop()
+	return NewApiConfigService(&config.Config{}, log, repository.New(newServiceTestDB(t)), NewCryptoService("metadata-test-secret", log))
+}
+
+func saveMetadataProbeConfig(t *testing.T, svc *ApiConfigService, provider, baseURL, key string) {
+	t.Helper()
+	if _, err := svc.Upsert(t.Context(), provider, key, baseURL, "", true); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// Removing a dispatch branch, ignoring the saved URL/key, or using the wrong
+// endpoint must fail this integration test (real database and HTTP server).
+func TestMetadataConnectionUsesSavedConfig(t *testing.T) {
+	svc := newMetadataConnectionTestService(t)
+	for _, fixture := range metadataProbeFixtures {
+		t.Run(fixture.provider, func(t *testing.T) {
+			calls := 0
+			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				calls++
+				if r.URL.Path != "/proxy"+fixture.path {
+					t.Errorf("request path = %q", r.URL.Path)
+				}
+				if r.Header.Get("User-Agent") == "" {
+					t.Error("missing User-Agent")
+				}
+				if fixture.provider == "thetvdb" {
+					var body map[string]string
+					if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+						t.Error(err)
+					}
+					if r.Method != http.MethodPost || body["apikey"] != fixture.key || r.Header.Get("Content-Type") != "application/json" {
+						t.Error("TheTVDB login must POST the saved, decrypted API key as JSON")
+					}
+				} else if r.Method != http.MethodGet {
+					t.Errorf("method = %s, want GET", r.Method)
+				}
+				if fixture.provider == "fanart" && r.URL.Query().Get("api_key") != fixture.key {
+					t.Error("Fanart API key was not escaped/passed correctly")
+				}
+				if fixture.provider == "douban" {
+					if r.Header.Get("Cookie") != fixture.key || r.Header.Get("Referer") != "https://movie.douban.com/" || r.URL.Query().Get("q") == "" {
+						t.Error("Douban search must carry the configured cookie, referer and query")
+					}
+				}
+				w.Header().Set("Content-Type", "application/json")
+				_, _ = w.Write([]byte(fixture.body))
+			}))
+			defer server.Close()
+			saveMetadataProbeConfig(t, svc, fixture.provider, "  "+server.URL+"/proxy/  ", fixture.key)
+			result, err := svc.TestConnection(t.Context(), fixture.provider)
+			if err != nil || result != "success" {
+				t.Fatalf("TestConnection = %q, %v, want success", result, err)
+			}
+			if calls != 1 {
+				t.Errorf("HTTP calls = %d, want 1", calls)
+			}
+		})
+	}
+}
+
+func TestMetadataConnectionRejectsBadResponses(t *testing.T) {
+	svc := newMetadataConnectionTestService(t)
+	for _, fixture := range metadataProbeFixtures {
+		for _, response := range []struct {
+			name   string
+			status int
+			body   string
+			result string
+		}{
+			{"unauthorized", 401, `{"error":"denied"}`, "invalid"},
+			{"forbidden", 403, `<html>Access denied</html>`, "error"},
+			{"rate limited", 429, `{}`, "error"},
+			{"upstream error", 503, `{}`, "error"},
+			{"challenge page", 200, `<html>Please log in or complete verification</html>`, "error"},
+			{"empty body", 200, ``, "error"},
+			{"wrong schema", 200, `{"error":"intercepted"}`, "error"},
+			{"null", 200, `null`, "error"},
+			{"trailing garbage", 200, fixture.body + `<html>blocked</html>`, "error"},
+		} {
+			t.Run(fixture.provider+"/"+response.name, func(t *testing.T) {
+				server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+					w.WriteHeader(response.status)
+					_, _ = w.Write([]byte(response.body))
+				}))
+				defer server.Close()
+				saveMetadataProbeConfig(t, svc, fixture.provider, server.URL, fixture.key)
+				result, err := svc.TestConnection(t.Context(), fixture.provider)
+				if err == nil || result != response.result {
+					t.Fatalf("TestConnection = %q, %v, want %q and error", result, err, response.result)
+				}
+				if fixture.key != "" && strings.Contains(err.Error(), fixture.key) {
+					t.Error("error exposes configured credentials")
+				}
+			})
+		}
+	}
+}
+
+func TestMetadataConnectionRequiresAPIKeys(t *testing.T) {
+	svc := newMetadataConnectionTestService(t)
+	for _, provider := range []string{"thetvdb", "fanart"} {
+		t.Run(provider, func(t *testing.T) {
+			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				t.Error("must reject missing key before making a request")
+			}))
+			defer server.Close()
+			saveMetadataProbeConfig(t, svc, provider, server.URL, "  ")
+			result, err := svc.TestConnection(t.Context(), provider)
+			if result != "error" || err == nil || !strings.Contains(err.Error(), "API key") {
+				t.Fatalf("TestConnection = %q, %v, want missing API key error", result, err)
+			}
+		})
+	}
+}
+
+func TestMetadataConnectionBangumiValidatesConfiguredToken(t *testing.T) {
+	svc := newMetadataConnectionTestService(t)
+	for _, valid := range []bool{true, false} {
+		name := "valid"
+		if !valid {
+			name = "invalid"
+		}
+		t.Run(name, func(t *testing.T) {
+			meCalls, subjectCalls := 0, 0
+			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				if r.Header.Get("Authorization") != "Bearer bangumi-test-token" {
+					t.Error("missing saved Bangumi bearer token")
+				}
+				switch r.URL.Path {
+				case "/v0/me":
+					meCalls++
+					if !valid {
+						w.WriteHeader(http.StatusUnauthorized)
+						return
+					}
+					_, _ = w.Write([]byte(`{"id":42,"username":"test-user"}`))
+				case "/v0/subjects/253":
+					subjectCalls++
+					_, _ = w.Write([]byte(`{"id":253,"name":"カウボーイビバップ"}`))
+				default:
+					t.Errorf("unexpected path: %s", r.URL.Path)
+					w.WriteHeader(http.StatusNotFound)
+				}
+			}))
+			defer server.Close()
+			saveMetadataProbeConfig(t, svc, "bangumi", server.URL, "bangumi-test-token")
+			result, err := svc.TestConnection(t.Context(), "bangumi")
+			if valid && (result != "success" || err != nil || subjectCalls != 1) {
+				t.Fatalf("valid token: result=%q err=%v subjectCalls=%d", result, err, subjectCalls)
+			}
+			if !valid && (result != "invalid" || err == nil || subjectCalls != 0) {
+				t.Fatalf("invalid token: result=%q err=%v subjectCalls=%d", result, err, subjectCalls)
+			}
+			if meCalls != 1 {
+				t.Errorf("identity requests = %d, want 1", meCalls)
+			}
+		})
+	}
+}
+
+func TestMetadataConnectionDoubanDoesNotRequireCookie(t *testing.T) {
+	svc := newMetadataConnectionTestService(t)
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Header.Get("Cookie") != "" {
+			t.Error("unexpected Cookie for public search")
+		}
+		_, _ = w.Write([]byte(`[]`))
+	}))
+	defer server.Close()
+	saveMetadataProbeConfig(t, svc, "douban", server.URL, "")
+	result, err := svc.TestConnection(t.Context(), "douban")
+	if result != "success" || err != nil {
+		t.Fatalf("public search with empty results = %q, %v", result, err)
+	}
+}
+
+func TestMetadataConnectionHonorsContext(t *testing.T) {
+	svc := newMetadataConnectionTestService(t)
+	for _, fixture := range metadataProbeFixtures {
+		t.Run(fixture.provider, func(t *testing.T) {
+			started := make(chan struct{})
+			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				_, _ = io.Copy(io.Discard, r.Body)
+				close(started)
+				<-r.Context().Done()
+			}))
+			defer server.Close()
+			saveMetadataProbeConfig(t, svc, fixture.provider, server.URL, fixture.key)
+			ctx, cancel := context.WithTimeout(t.Context(), 2*time.Second)
+			defer cancel()
+			go func() {
+				select {
+				case <-started:
+					cancel()
+				case <-ctx.Done():
+				}
+			}()
+			result, err := svc.TestConnection(ctx, fixture.provider)
+			if result != "error" || !errors.Is(err, context.Canceled) {
+				t.Fatalf("cancelled request = %q, %v, want context.Canceled", result, err)
+			}
+		})
+	}
+}
+
+func TestMetadataConnectionTransportErrorsHideKeys(t *testing.T) {
+	svc := newMetadataConnectionTestService(t)
+	server := httptest.NewServer(http.NotFoundHandler())
+	server.Close()
+	key := "sensitive-fanart-key"
+	saveMetadataProbeConfig(t, svc, "fanart", server.URL, key)
+	result, err := svc.TestConnection(t.Context(), "fanart")
+	if result != "error" || err == nil || strings.Contains(err.Error(), key) {
+		t.Fatalf("transport failure = %q, %v, want error without credentials", result, err)
+	}
+}
@@ -5,7 +5,7 @@
 //
 // 两种方言的备份形态不同：
 //   - SQLite：用 "VACUUM INTO"（3.27.0 起可用）产出一个一致的库文件，
-//     扩展名 .db；恢复即「替换库文件 + 重启」。
+//     扩展名 .db；恢复先暂存，在下次启动打开数据库前替换文件。
 //   - PostgreSQL：没有单文件语义，用逻辑备份（见 backup_postgres.go），
 //     扩展名 .json.gz；恢复是在单个事务内重建全部表。
 package service
@@ -24,6 +24,7 @@ import (
 	"gorm.io/gorm"

 	"github.com/truewhile/MeBox/internal/config"
+	"github.com/truewhile/MeBox/internal/database"
 )

 // BackupService manages database backups.
@@ -44,6 +45,7 @@ type BackupInfo struct {
 	Path      string    `json:"path"`
 	Size      int64     `json:"size"`
 	CreatedAt time.Time `json:"created_at"`
+	Automatic bool      `json:"automatic"`
 }

 func (b *BackupService) backupDir() string {
@@ -69,6 +71,23 @@ func (b *BackupService) backupFilePath(filename string) (string, error) {
 	return path, nil
 }

+// ResolvePath returns the absolute path of a listed backup after applying the
+// same filename and directory checks used by restore and delete operations.
+func (b *BackupService) ResolvePath(filename string) (string, error) {
+	path, err := b.backupFilePath(filename)
+	if err != nil {
+		return "", err
+	}
+	info, err := os.Lstat(path)
+	if err != nil {
+		return "", err
+	}
+	if !info.Mode().IsRegular() {
+		return "", errors.New("backup is not a regular file")
+	}
+	return path, nil
+}
+
 // isPostgres reports whether the service is backed by PostgreSQL.
 //
 // PostgreSQL 不支持 SQLite 的 "VACUUM INTO"，按文件替换恢复也会写错目标，
@@ -80,11 +99,23 @@ func (b *BackupService) isPostgres() bool {
 // Create produces a new hot backup. SQLite uses "VACUUM INTO"; PostgreSQL uses
 // a logical dump.
 func (b *BackupService) Create(ctx context.Context) (*BackupInfo, error) {
+	return b.create(ctx, false)
+}
+
+func (b *BackupService) CreateAutomatic(ctx context.Context) (*BackupInfo, error) {
+	return b.create(ctx, true)
+}
+
+func (b *BackupService) create(ctx context.Context, automatic bool) (*BackupInfo, error) {
 	dir := b.backupDir()
 	if err := os.MkdirAll(dir, 0o750); err != nil {
 		return nil, err
 	}
-	ts := time.Now().Format("20060102_150405")
+	now := time.Now()
+	ts := fmt.Sprintf("%s_%09d", now.Format("20060102_150405"), now.Nanosecond())
+	if automatic {
+		ts = "auto_" + ts
+	}

 	var (
 		dst string
@@ -108,15 +139,24 @@ func (b *BackupService) Create(ctx context.Context) (*BackupInfo, error) {
 		Path:      dst,
 		Size:      stat.Size(),
 		CreatedAt: stat.ModTime(),
+		Automatic: automatic,
 	}, nil
 }

 func (b *BackupService) createSQLiteBackup(ctx context.Context, stamp string) (string, error) {
 	dst := filepath.Join(b.backupDir(), fmt.Sprintf("mebox_%s.db", stamp))
-	// VACUUM INTO creates a clean, non-WAL copy atomically.
-	if err := b.db.WithContext(ctx).Exec("VACUUM INTO ?", dst).Error; err != nil {
+	tmp := dst + ".tmp"
+	defer os.Remove(tmp)
+	// Publish only completed backups, with credentials protected by file mode.
+	if err := b.db.WithContext(ctx).Exec("VACUUM INTO ?", tmp).Error; err != nil {
 		return "", fmt.Errorf("VACUUM INTO failed: %w", err)
 	}
+	if err := os.Chmod(tmp, 0o600); err != nil {
+		return "", err
+	}
+	if err := os.Rename(tmp, dst); err != nil {
+		return "", err
+	}
 	return dst, nil
 }

@@ -132,7 +172,7 @@ func (b *BackupService) List() ([]BackupInfo, error) {
 	}
 	out := make([]BackupInfo, 0, len(entries))
 	for _, e := range entries {
-		if e.IsDir() || !isBackupFilename(e.Name()) {
+		if !e.Type().IsRegular() || !isBackupFilename(e.Name()) {
 			continue
 		}
 		info, err := e.Info()
@@ -144,6 +184,7 @@ func (b *BackupService) List() ([]BackupInfo, error) {
 			Path:      filepath.Join(dir, e.Name()),
 			Size:      info.Size(),
 			CreatedAt: info.ModTime(),
+			Automatic: strings.HasPrefix(e.Name(), "mebox_auto_"),
 		})
 	}
 	sort.Slice(out, func(i, j int) bool {
@@ -152,6 +193,36 @@ func (b *BackupService) List() ([]BackupInfo, error) {
 	return out, nil
 }

+// Prune keeps maxCount automatic backups for the current database dialect.
+// Manual backups and backups from another dialect are never pruned.
+// A value below one disables pruning so an invalid setting cannot erase all
+// recoverable copies.
+func (b *BackupService) Prune(maxCount int) error {
+	if maxCount < 1 {
+		return nil
+	}
+	items, err := b.List()
+	if err != nil {
+		return err
+	}
+	eligible := items[:0]
+	for _, item := range items {
+		if item.Automatic && strings.HasSuffix(item.Filename, postgresBackupSuffix) == b.isPostgres() {
+			eligible = append(eligible, item)
+		}
+	}
+	items = eligible
+	if maxCount >= len(items) {
+		return nil
+	}
+	for _, item := range items[maxCount:] {
+		if err := b.Delete(item.Filename); err != nil && !errors.Is(err, os.ErrNotExist) {
+			return err
+		}
+	}
+	return nil
+}
+
 // Delete removes a single backup file.
 func (b *BackupService) Delete(filename string) error {
 	path, err := b.backupFilePath(filename)
@@ -161,12 +232,10 @@ func (b *BackupService) Delete(filename string) error {
 	return os.Remove(path)
 }

-// Restore replaces the live database with the given backup.
-// WARNING: this is destructive. SQLite restores by swapping the database file
-// (the caller should shut down the server afterwards); PostgreSQL restores by
-// rebuilding every table inside a single transaction.
+// Restore stages SQLite backups for the next startup. PostgreSQL restores
+// rebuild every table inside a single transaction.
 func (b *BackupService) Restore(ctx context.Context, filename string) error {
-	src, err := b.backupFilePath(filename)
+	src, err := b.ResolvePath(filename)
 	if err != nil {
 		return err
 	}
@@ -182,35 +251,10 @@ func (b *BackupService) Restore(ctx context.Context, filename string) error {
 	if !strings.HasSuffix(filename, ".db") {
 		return errors.New("该备份是 PostgreSQL 逻辑备份，当前运行在 SQLite 上，无法恢复")
 	}
-	return b.restoreSQLiteBackup(filename, src)
-}
-
-func (b *BackupService) restoreSQLiteBackup(filename, src string) error {
-	dbPath, err := filepath.Abs(b.cfg.Database.DBPath)
-	if err != nil || dbPath == "" {
-		return errors.New("invalid database path")
-	}
-	// Strategy: rename live → live.old, copy backup → live, delete old.
-	old := dbPath + ".before_restore"
-	if err := os.Rename(dbPath, old); err != nil && !errors.Is(err, os.ErrNotExist) {
+	if err := database.StageSQLiteRestore(ctx, b.cfg, src); err != nil {
 		return err
 	}
-	data, err := os.ReadFile(src) // #nosec G304 -- src is constrained by backupFilePath to the configured backups directory.
-	if err != nil {
-		// Revert
-		_ = os.Rename(old, dbPath)
-		return err
-	}
-	if err := os.WriteFile(dbPath, data, 0o600); err != nil { // #nosec G703 -- database path is trusted process config and normalized before restore.
-		_ = os.Rename(old, dbPath)
-		return err
-	}
-	_ = os.Remove(old)
-	// Also remove WAL/SHM so SQLite opens the fresh file cleanly.
-	_ = os.Remove(dbPath + "-wal")
-	_ = os.Remove(dbPath + "-shm")
-	b.log.Warn("database restored from backup — restart the server",
-		zap.String("backup", filename))
+	b.log.Warn("SQLite backup staged; restart to apply", zap.String("backup", filename))
 	return nil
 }

@@ -3,6 +3,7 @@ package service
 import (
 	"compress/gzip"
 	"context"
+	"database/sql"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -87,7 +88,8 @@ func postgresBackupModelSchemas(db *gorm.DB) (map[string]*schema.Schema, map[str
 // createPostgresBackup 把全库导出成一个 gzip 压缩的 JSON Lines 文件。
 func (b *BackupService) createPostgresBackup(ctx context.Context, stamp string) (string, error) {
 	dst := filepath.Join(b.backupDir(), "mebox_"+stamp+postgresBackupSuffix)
-	file, err := os.OpenFile(dst, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0o600)
+	tmp := dst + ".tmp"
+	file, err := os.OpenFile(tmp, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0o600)
 	if err != nil {
 		return "", err
 	}
@@ -96,7 +98,7 @@ func (b *BackupService) createPostgresBackup(ctx context.Context, stamp string)
 		_ = file.Close()
 		if !complete {
 			// 半截备份文件比没有备份更危险：留着会让人以为有可用的还原点。
-			_ = os.Remove(dst)
+			_ = os.Remove(tmp)
 		}
 	}()

@@ -109,17 +111,30 @@ func (b *BackupService) createPostgresBackup(ctx context.Context, stamp string)
 	}); err != nil {
 		return "", fmt.Errorf("写入备份头失败: %w", err)
 	}
-	for _, m := range model.AllModels() {
-		table, sch, err := parseModelSchema(b.db, m)
-		if err != nil {
-			return "", err
-		}
-		if !b.db.Migrator().HasTable(table) {
-			continue
-		}
-		if err := b.dumpPostgresTable(ctx, m, sch, table, enc); err != nil {
-			return "", err
+	var options []*sql.TxOptions
+	if b.isPostgres() {
+		options = append(options, &sql.TxOptions{Isolation: sql.LevelRepeatableRead, ReadOnly: true})
+	}
+	// Every table must come from the same snapshot, including while background
+	// workers are inserting related rows during an automatic backup.
+	if err := b.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		snapshot := *b
+		snapshot.db = tx
+		for _, m := range model.AllModels() {
+			table, sch, err := parseModelSchema(tx, m)
+			if err != nil {
+				return err
+			}
+			if !tx.Migrator().HasTable(table) {
+				continue
+			}
+			if err := snapshot.dumpPostgresTable(ctx, m, sch, table, enc); err != nil {
+				return err
+			}
 		}
+		return nil
+	}, options...); err != nil {
+		return "", err
 	}
 	if err := zw.Close(); err != nil {
 		return "", fmt.Errorf("压缩备份失败: %w", err)
@@ -127,6 +142,12 @@ func (b *BackupService) createPostgresBackup(ctx context.Context, stamp string)
 	if err := file.Sync(); err != nil {
 		return "", fmt.Errorf("写入备份失败: %w", err)
 	}
+	if err := file.Close(); err != nil {
+		return "", err
+	}
+	if err := os.Rename(tmp, dst); err != nil {
+		return "", err
+	}
 	complete = true
 	return dst, nil
 }
@@ -0,0 +1,65 @@
+package service
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+	"testing"
+	"time"
+)
+
+func TestBackupRetentionPreservesManualAndOtherDialectBackups(t *testing.T) {
+	svc, _ := newBackupTestService(t)
+	names := []string{"mebox_auto_new.db", "mebox_auto_old.db", "mebox_manual.db", "mebox_auto_postgres.json.gz"}
+	for i, name := range names {
+		path := filepath.Join(svc.backupDir(), name)
+		if err := os.WriteFile(path, []byte("fixture"), 0o600); err != nil {
+			t.Fatal(err)
+		}
+		when := time.Now().Add(-time.Duration(i) * time.Hour)
+		if err := os.Chtimes(path, when, when); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err := svc.Prune(1); err != nil {
+		t.Fatal(err)
+	}
+	for _, name := range names {
+		_, err := os.Stat(filepath.Join(svc.backupDir(), name))
+		if name == "mebox_auto_old.db" {
+			if !os.IsNotExist(err) {
+				t.Fatalf("old automatic backup was retained: %v", err)
+			}
+		} else if err != nil {
+			t.Fatalf("backup %s should have been preserved: %v", name, err)
+		}
+	}
+}
+
+func TestBackupCreateUsesUniquePrivateCompletedFiles(t *testing.T) {
+	svc, _ := newBackupTestService(t)
+	manual, err := svc.Create(t.Context())
+	if err != nil {
+		t.Fatal(err)
+	}
+	automatic, err := svc.CreateAutomatic(t.Context())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if manual.Filename == automatic.Filename || manual.Automatic || !automatic.Automatic {
+		t.Fatalf("invalid backup identities: manual=%#v automatic=%#v", manual, automatic)
+	}
+	items, err := svc.List()
+	if err != nil || len(items) != 2 {
+		t.Fatalf("completed backup list: items=%#v err=%v", items, err)
+	}
+	for _, item := range items {
+		info, err := os.Stat(item.Path)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if runtime.GOOS != "windows" && info.Mode().Perm() != 0o600 {
+			t.Fatalf("backup permissions are not private: %s err=%v", item.Path, err)
+		}
+	}
+}
@@ -74,22 +74,20 @@ type ImageCacheScope struct {
 	DropUnknownResizeVariants bool
 }

-// ImageCachePool 描述一个图片缓存池：范围 + 自身配额 + 保留时长。
+// ImageCachePool 描述一个图片缓存池：范围 + 自身配额。
 //
 // 分池的意义在于两类缓存的“可再生成本”完全不同：原图只是生成缩略图的原料，
 // 丢了可以重新回源；派生缩略图是客户端热路径真正读取的成品，重新生成代价高。
-// 因此原图配小配额、短保留，总量超限时也优先淘汰原图。
+// 因此原图配小配额，总量超限时也优先淘汰原图。
+//
+// 淘汰只看占用（配额头寸），不按文件年龄删除：缩略图生成成本高，只要磁盘还
+// 放得下就该留着，让再次浏览直接命中缓存。
 type ImageCachePool struct {
 	Name     string
 	Scopes   []ImageCacheScope
-	MaxBytes int64         // 0 = 不单独限制
-	MaxAge   time.Duration // 0 = 不按时间淘汰
+	MaxBytes int64 // 0 = 不单独限制
 }

-// imageFailMarkerMaxAge 是失败标记文件的保留时长：标记只用于观测/重试，
-// 过期即视为噪音清掉（不会因为标记残留而阻止重新抓取）。
-const imageFailMarkerMaxAge = 24 * time.Hour
-
 // tempImageCacheFile 报告文件名是否是下载/缩放过程中的临时文件。它们正在被
 // 并发写入，清理时必须跳过。
 func tempImageCacheFile(name string) bool {
@@ -182,12 +180,14 @@ func removeImageCacheEntry(entry imageCacheFileEntry, result *PruneImageCacheRes
 	_ = os.Remove(entry.path + ".fail")
 }

-// PruneImageCachePools 按池清理图片缓存：
-//  1. 删除超过池 MaxAge 的文件（原图按保留时长淘汰）；
-//  2. 池自身超过 MaxBytes 时按 mtime 淘汰到 80%（留水位，避免连续写入即触发）；
-//  3. 全部池合计超过 totalBytes 时，仍按“先原图、后派生”的顺序淘汰最旧文件，
+// PruneImageCachePools 按池清理图片缓存，只做占用淘汰：
+//  1. 池自身超过 MaxBytes 时按 mtime 淘汰到 80%（留水位，避免连续写入即触发）；
+//  2. 全部池合计超过 totalBytes 时，仍按“先原图、后派生”的顺序淘汰最旧文件，
 //     使总量上限始终是硬保证，同时让客户端热路径的缩略图活得更久。
 //
+// 不按文件年龄删除：过期即删会让一张几天前看过的海报重新解码（2 核机器上
+// 每张约 0.2 秒），代价远高于占着那几十 KB 磁盘。
+//
 // 传入的池顺序即总量超限时的淘汰优先级（排在前面的先被淘汰）。
 func PruneImageCachePools(pools []ImageCachePool, totalBytes int64) (PruneImageCacheResult, error) {
 	var result PruneImageCacheResult
@@ -207,16 +207,18 @@ func PruneImageCachePools(pools []ImageCachePool, totalBytes int64) (PruneImageC
 	}
 	result.RemainingBytes = result.TotalBytesBefore

-	// 过期的失败标记直接清掉：它们不计容量，只用于观测与重试。
-	cutoffMarkers := time.Now().Add(-imageFailMarkerMaxAge)
+	// 失败标记不计入容量：只清掉对应缓存文件已经不存在的孤儿标记（它们只是
+	// 观测/重试用的噪音，留着没有任何作用）。
 	for _, marker := range failMarkers {
-		if marker.modTime.Before(cutoffMarkers) {
-			_ = os.Remove(marker.path)
+		base := strings.TrimSuffix(marker.path, ".fail")
+		if _, err := os.Stat(base); err == nil {
+			continue
 		}
+		_ = os.Remove(marker.path)
 	}

-	now := time.Now()
 	deleted := make(map[string]bool, len(entries))
+
 	deleteEntry := func(entry imageCacheFileEntry) {
 		if deleted[entry.path] {
 			return
@@ -225,20 +227,7 @@ func PruneImageCachePools(pools []ImageCachePool, totalBytes int64) (PruneImageC
 		removeImageCacheEntry(entry, &result)
 	}

-	// 1. 按池保留时长淘汰（原图池）。
-	for i := range pools {
-		if pools[i].MaxAge <= 0 {
-			continue
-		}
-		cutoff := now.Add(-pools[i].MaxAge)
-		for _, entry := range entries {
-			if entry.pool == i && entry.modTime.Before(cutoff) {
-				deleteEntry(entry)
-			}
-		}
-	}
-
-	// 2. 池自身配额。
+	// 1. 池自身配额。
 	for i := range pools {
 		maxBytes := pools[i].MaxBytes
 		if maxBytes <= 0 {
@@ -263,7 +252,7 @@ func PruneImageCachePools(pools []ImageCachePool, totalBytes int64) (PruneImageC
 		}
 	}

-	// 3. 总量硬上限：跨池按淘汰优先级（池顺序）再按 mtime 淘汰。
+	// 2. 总量硬上限：跨池按淘汰优先级（池顺序）再按 mtime 淘汰。
 	if totalBytes > 0 && result.RemainingBytes > totalBytes {
 		target := totalBytes * 80 / 100
 		for _, entry := range evictionOrder(entries, deleted) {
@@ -357,11 +346,10 @@ func PruneImageCache(imagesDir string, maxSizeBytes int64) (PruneImageCacheResul
 // 第一个池是原图：历史版本平铺在 images/ 下的旧缓存也归入此池，升级后会被
 // 逐步淘汰；第二个池是派生成品（本地缩放结果 + 挂载 Emby 按尺寸返回的成品）。
 // 池顺序即总量超限时的淘汰优先级。
-func ImageCachePools(imagesDir string, originalsMaxBytes int64, originalsMaxAge time.Duration) []ImageCachePool {
+func ImageCachePools(imagesDir string, originalsMaxBytes int64) []ImageCachePool {
 	originals := ImageCachePool{
 		Name:     "originals",
 		MaxBytes: originalsMaxBytes,
-		MaxAge:   originalsMaxAge,
 		Scopes: []ImageCacheScope{
 			{Root: imagesDir, Recursive: false}, // 旧版平铺布局
 			{Root: filepath.Join(imagesDir, imageOriginalCacheSubdir), Recursive: true},
@@ -376,3 +364,199 @@ func ImageCachePools(imagesDir string, originalsMaxBytes int64, originalsMaxAge
 	}
 	return []ImageCachePool{originals, derived}
 }
+
+// CacheCleanupResult 是全缓存容量淘汰的统计。
+type CacheCleanupResult struct {
+	TotalFilesBefore int
+	TotalBytesBefore int64
+	DeletedFiles     int
+	FreedBytes       int64
+	RemainingBytes   int64
+	// FreedByPool 记录每个池释放的字节数，方便日志定位到底是哪类缓存占满了。
+	FreedByPool map[string]int64
+}
+
+// cacheEvictionEntry 是全局容量淘汰里的一个候选文件。
+type cacheEvictionEntry struct {
+	path    string
+	pool    string
+	size    int64
+	modTime time.Time
+}
+
+// cacheEvictionPoolOrder 是全局容量清理的固定优先级。
+// 顺序即“先清谁”：超限时前面的池会被整池清空，才会轮到后面的池。
+// reader-audio 不在其中：它由自身固定配额（当前 1GiB，见 reader 包的
+// audioMediaMaxBytes）在写入时独立淘汰。
+var cacheEvictionPoolOrder = []string{
+	"hls",
+	"images",
+	"library-covers",
+}
+
+// cacheCleanupKeepPercent 是触发清理后回落到的水位（占上限的百分比）。
+// 留出余量，避免刚清完又被下一次写入立刻顶到上限。
+const cacheCleanupKeepPercent = 80
+
+// tempCacheFile 判断文件名是否是缓存写入中的临时产物。这些文件正在被并发
+// 写入，容量统计和清理都应跳过。
+func tempCacheFile(name string) bool {
+	if tempImageCacheFile(name) {
+		return true
+	}
+	if strings.HasSuffix(name, ".part") {
+		return true
+	}
+	// 各缓存目录的原子写入临时文件前缀：.content- / .cover- / .audio- / .js-cache-。
+	return strings.HasPrefix(name, ".content-") ||
+		strings.HasPrefix(name, ".cover-") ||
+		strings.HasPrefix(name, ".audio-") ||
+		strings.HasPrefix(name, ".js-cache-")
+}
+
+// collectCachePoolFiles 递归收集一个普通缓存池里的候选文件，按 mtime 从旧到新。
+func collectCachePoolFiles(root, pool string) []cacheEvictionEntry {
+	if strings.TrimSpace(root) == "" {
+		return nil
+	}
+	var out []cacheEvictionEntry
+	_ = filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+		if err != nil || info == nil || info.IsDir() {
+			return nil
+		}
+		if !info.Mode().IsRegular() {
+			return nil
+		}
+		name := info.Name()
+		if tempCacheFile(name) || strings.HasSuffix(name, ".fail") {
+			return nil
+		}
+		out = append(out, cacheEvictionEntry{
+			path:    path,
+			pool:    pool,
+			size:    info.Size(),
+			modTime: info.ModTime(),
+		})
+		return nil
+	})
+	sort.Slice(out, func(i, j int) bool { return out[i].modTime.Before(out[j].modTime) })
+	return out
+}
+
+// collectImageCacheEntries 收集图片缓存候选文件。返回顺序沿用图片池的优先级：
+// 先原图、后派生成品，池内按 mtime 从旧到新。
+func collectImageCacheEntries(imagesDir string) []cacheEvictionEntry {
+	if strings.TrimSpace(imagesDir) == "" {
+		return nil
+	}
+	if _, err := os.Stat(imagesDir); err != nil {
+		return nil
+	}
+	pools := ImageCachePools(imagesDir, 0)
+	var entries []imageCacheFileEntry
+	var failMarkers []imageCacheFileEntry
+	for i, pool := range pools {
+		collectImageCachePoolFiles(pool, i, &entries, &failMarkers)
+	}
+	ordered := evictionOrder(entries, map[string]bool{})
+	out := make([]cacheEvictionEntry, 0, len(ordered))
+	for _, e := range ordered {
+		out = append(out, cacheEvictionEntry{
+			path:    e.path,
+			pool:    "images",
+			size:    e.size,
+			modTime: e.modTime,
+		})
+	}
+	return out
+}
+
+// removeEmptyDirsUnder 删除 root 下淘汰后留下的空子目录（不含 root 本身）。
+func removeEmptyDirsUnder(root string) {
+	if strings.TrimSpace(root) == "" {
+		return
+	}
+	if _, err := os.Stat(root); err != nil {
+		return
+	}
+	dirs := []string{}
+	_ = filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+		if err != nil || info == nil {
+			return nil
+		}
+		if info.IsDir() && path != root {
+			dirs = append(dirs, path)
+		}
+		return nil
+	})
+	for i := len(dirs) - 1; i >= 0; i-- {
+		_ = os.Remove(dirs[i])
+	}
+}
+
+// PruneCache 按全局容量池清理磁盘缓存。
+//
+// 总量口径是 hls、images、library-covers 三个池之和；reader-audio 及正文缓存、
+// 书源文件缓存都不参与这里的总量计算——reader-audio 由自身固定配额（当前
+// 1GiB）在写入时淘汰，正文缓存和书源文件缓存另有自己的 TTL / 配额。
+// 超过 totalBytes 时严格按 hls → images → library-covers 的顺序淘汰最旧文件，
+// 直到回落到上限的 80%。
+// originalsMaxBytes 是 images 原图池的独立子配额，在总量淘汰之后单独执行
+// （即使总量没超也会把原图压回配额）。
+func PruneCache(cacheDir string, totalBytes, originalsMaxBytes int64) (CacheCleanupResult, error) {
+	result := CacheCleanupResult{FreedByPool: map[string]int64{}}
+	if strings.TrimSpace(cacheDir) == "" {
+		return result, nil
+	}
+
+	imagesDir := filepath.Join(cacheDir, "images")
+	ordered := make([]cacheEvictionEntry, 0, 1024)
+	for _, name := range cacheEvictionPoolOrder {
+		if name == "images" {
+			ordered = append(ordered, collectImageCacheEntries(imagesDir)...)
+			continue
+		}
+		ordered = append(ordered, collectCachePoolFiles(filepath.Join(cacheDir, name), name)...)
+	}
+
+	result.TotalFilesBefore = len(ordered)
+	for _, entry := range ordered {
+		result.TotalBytesBefore += entry.size
+	}
+	result.RemainingBytes = result.TotalBytesBefore
+
+	// 1. 全局总量：严格按池优先级淘汰，直到回落到水位。
+	if totalBytes > 0 && result.RemainingBytes > totalBytes {
+		target := totalBytes * cacheCleanupKeepPercent / 100
+		for _, entry := range ordered {
+			if result.RemainingBytes <= target {
+				break
+			}
+			if err := os.Remove(entry.path); err != nil {
+				continue
+			}
+			result.DeletedFiles++
+			result.FreedBytes += entry.size
+			result.RemainingBytes -= entry.size
+			result.FreedByPool[entry.pool] += entry.size
+			_ = os.Remove(entry.path + ".fail")
+		}
+	}
+
+	// 2. 图片原图子配额独立于总量：即使总量没超，也要把原图压回自己的配额，
+	//    同时清掉旧命名变体和孤儿失败标记。
+	if _, err := os.Stat(imagesDir); err == nil {
+		pools := ImageCachePools(imagesDir, originalsMaxBytes)
+		if sub, err := PruneImageCachePools(pools, 0); err == nil {
+			result.DeletedFiles += sub.DeletedFiles
+			result.FreedBytes += sub.FreedBytes
+			result.RemainingBytes -= sub.FreedBytes
+			result.FreedByPool["images"] += sub.FreedBytes
+		}
+	}
+
+	for _, name := range cacheEvictionPoolOrder {
+		removeEmptyDirsUnder(filepath.Join(cacheDir, name))
+	}
+	return result, nil
+}
@@ -9,7 +9,7 @@ import (
 	"time"
 )

-// writePoolFile ?????????????????????????
+// writePoolFile ??????????????? mtime ???????
 func writePoolFile(t *testing.T, path string, size int, modTime time.Time) {
 	t.Helper()
 	if err := os.MkdirAll(filepath.Dir(path), 0o750); err != nil {
@@ -39,42 +39,38 @@ func mustExist(t *testing.T, path string) {
 	}
 }

-// currentVariantPath ????????????????.<??x<??q<??>.img??
-// ??????????????????????????
+// currentVariantPath ???????????????????
+// <64 ????>.<?>x<?>q<??>.img
 func currentVariantPath(dir, keyChar string, width, height, quality int) string {
 	key := strings.Repeat(keyChar, sha256HexLength)
 	return filepath.Join(dir, fmt.Sprintf("%s.%dx%dq%d.img", key, width, height, quality))
 }

-// TestPruneImageCachePoolsOriginalTTL ????????????????????
-// ?? TTL ??????????????????????
-func TestPruneImageCachePoolsOriginalTTL(t *testing.T) {
+// TestPruneImageCachePoolsKeepsOldFilesUnderQuota ????????????
+// ???????????????????????? / TTL ????
+func TestPruneImageCachePoolsKeepsOldFilesUnderQuota(t *testing.T) {
 	imagesDir := t.TempDir()
 	now := time.Now()

-	stale := filepath.Join(imagesDir, imageOriginalCacheSubdir, "stale-original")
-	fresh := filepath.Join(imagesDir, imageOriginalCacheSubdir, "fresh-original")
-	thumb := currentVariantPath(filepath.Join(imagesDir, imageResizeCacheSubdir), "b", 480, 600, 80)
-	writePoolFile(t, stale, 400, now.Add(-8*24*time.Hour))
-	writePoolFile(t, fresh, 400, now.Add(-1*time.Hour))
-	// ??????????TTL ????
-	writePoolFile(t, thumb, 400, now.Add(-8*24*time.Hour))
+	oldOriginal := filepath.Join(imagesDir, imageOriginalCacheSubdir, "old-original")
+	oldThumb := currentVariantPath(filepath.Join(imagesDir, imageResizeCacheSubdir), "b", 480, 600, 80)
+	writePoolFile(t, oldOriginal, 400, now.Add(-90*24*time.Hour))
+	writePoolFile(t, oldThumb, 400, now.Add(-90*24*time.Hour))

-	pools := ImageCachePools(imagesDir, 0, 7*24*time.Hour)
+	pools := ImageCachePools(imagesDir, 0)
 	res, err := PruneImageCachePools(pools, 100*1024*1024)
 	if err != nil {
 		t.Fatalf("prune failed: %v", err)
 	}
-	if res.DeletedFiles != 1 {
-		t.Fatalf("deleted files = %d, want 1", res.DeletedFiles)
+	if res.DeletedFiles != 0 {
+		t.Fatalf("deleted files = %d, want 0 (age must not trigger deletion)", res.DeletedFiles)
 	}
-	mustNotExist(t, stale)
-	mustExist(t, fresh)
-	mustExist(t, thumb)
+	mustExist(t, oldOriginal)
+	mustExist(t, oldThumb)
 }

 // TestPruneImageCachePoolsEvictsOriginalsBeforeDerived ????????????
-// ????????????????????
+// ????????????????
 func TestPruneImageCachePoolsEvictsOriginalsBeforeDerived(t *testing.T) {
 	imagesDir := t.TempDir()
 	now := time.Now()
@@ -82,13 +78,13 @@ func TestPruneImageCachePoolsEvictsOriginalsBeforeDerived(t *testing.T) {
 	original := filepath.Join(imagesDir, imageOriginalCacheSubdir, "original")
 	rendition := filepath.Join(imagesDir, imageRenditionCacheSubdir, "rendition")
 	thumb := currentVariantPath(filepath.Join(imagesDir, imageResizeCacheSubdir), "c", 480, 600, 80)
-	// ?????????????????
+	// ?????????????????????????
 	writePoolFile(t, original, 1024*1024, now.Add(-72*time.Hour))
 	writePoolFile(t, rendition, 1024*1024, now.Add(-2*time.Hour))
 	writePoolFile(t, thumb, 1024*1024, now.Add(-1*time.Hour))

-	pools := ImageCachePools(imagesDir, 0, 0)
-	// ?? 3MB????2.4MB -> ????? 1.92MB??
+	pools := ImageCachePools(imagesDir, 0)
+	// ?? 3MB??? 2.4MB -> ??? 1.92MB ???
 	res, err := PruneImageCachePools(pools, 2*1024*1024+400*1024)
 	if err != nil {
 		t.Fatalf("prune failed: %v", err)
@@ -104,8 +100,8 @@ func TestPruneImageCachePoolsEvictsOriginalsBeforeDerived(t *testing.T) {
 	}
 }

-// TestPruneImageCachePoolsOriginalQuotaKeepsDerived ????????????
-// ??????????????
+// TestPruneImageCachePoolsOriginalQuotaKeepsDerived ???????????
+// ????????????
 func TestPruneImageCachePoolsOriginalQuotaKeepsDerived(t *testing.T) {
 	imagesDir := t.TempDir()
 	now := time.Now()
@@ -117,8 +113,8 @@ func TestPruneImageCachePoolsOriginalQuotaKeepsDerived(t *testing.T) {
 	writePoolFile(t, newOriginal, 800, now.Add(-1*time.Hour))
 	writePoolFile(t, thumb, 800, now.Add(-2*time.Hour))

-	// ???? 1000 ??????????1600 -> ????800????? 1 ????
-	pools := ImageCachePools(imagesDir, 1000, 0)
+	// ???? 1000??? 1600 ?? -> ??? 800??? 1 ???????
+	pools := ImageCachePools(imagesDir, 1000)
 	res, err := PruneImageCachePools(pools, 0)
 	if err != nil {
 		t.Fatalf("prune failed: %v", err)
@@ -131,24 +127,26 @@ func TestPruneImageCachePoolsOriginalQuotaKeepsDerived(t *testing.T) {
 	mustExist(t, thumb)
 }

-// TestPruneImageCachePoolsCleansFailMarkers ????????????????
-// ????????????????
+// TestPruneImageCachePoolsCleansFailMarkers ???????????????
+// ???????????????????????????????????
 func TestPruneImageCachePoolsCleansFailMarkers(t *testing.T) {
 	imagesDir := t.TempDir()
 	now := time.Now()

 	entry := filepath.Join(imagesDir, imageOriginalCacheSubdir, "entry")
 	entryMarker := entry + ".fail"
+	kept := filepath.Join(imagesDir, imageOriginalCacheSubdir, "kept")
+	keptMarker := kept + ".fail"
 	orphanMarker := filepath.Join(imagesDir, imageOriginalCacheSubdir, "orphan.fail")
-	freshMarker := filepath.Join(imagesDir, imageOriginalCacheSubdir, "fresh.fail")

-	writePoolFile(t, entry, 900, now.Add(-10*time.Hour))
-	writePoolFile(t, entryMarker, 35, now.Add(-10*time.Hour))
+	writePoolFile(t, entry, 900, now.Add(-2*time.Hour))
+	writePoolFile(t, entryMarker, 35, now.Add(-2*time.Hour))
+	writePoolFile(t, kept, 300, now.Add(-1*time.Hour))
+	writePoolFile(t, keptMarker, 35, now.Add(-1*time.Hour))
 	writePoolFile(t, orphanMarker, 35, now.Add(-48*time.Hour))
-	writePoolFile(t, freshMarker, 35, now.Add(-1*time.Minute))

-	// ???? 500????900 ?????????????????
-	pools := ImageCachePools(imagesDir, 500, 0)
+	// ???? 500??? 900+300=1200 ???? mtime ????? entry ? 400?
+	pools := ImageCachePools(imagesDir, 500)
 	res, err := PruneImageCachePools(pools, 0)
 	if err != nil {
 		t.Fatalf("prune failed: %v", err)
@@ -158,26 +156,27 @@ func TestPruneImageCachePoolsCleansFailMarkers(t *testing.T) {
 	}
 	mustNotExist(t, entry)
 	mustNotExist(t, entryMarker)
+	mustExist(t, kept)
+	mustExist(t, keptMarker)
 	mustNotExist(t, orphanMarker)
-	mustExist(t, freshMarker)
 }

-// TestPruneImageCachePoolsSkipsTemporaryFiles ????????????????
+// TestPruneImageCachePoolsSkipsTemporaryFiles ??????????????
 // ?????????????????
 func TestPruneImageCachePoolsSkipsTemporaryFiles(t *testing.T) {
 	imagesDir := t.TempDir()
 	tmp := filepath.Join(imagesDir, imageOriginalCacheSubdir, "img-1234.tmp")
 	writePoolFile(t, tmp, 4096, time.Now().Add(-48*time.Hour))

-	pools := ImageCachePools(imagesDir, 1, 0)
+	pools := ImageCachePools(imagesDir, 1)
 	if _, err := PruneImageCachePools(pools, 1); err != nil {
 		t.Fatalf("prune failed: %v", err)
 	}
 	mustExist(t, tmp)
 }

-// TestPruneImageCachePoolsDropsLegacyResizeVariants ????????.img????
-// ?????????????????????????????????????
+// TestPruneImageCachePoolsDropsLegacyResizeVariants ?????? .img ??
+// ???????????????????????????
 func TestPruneImageCachePoolsDropsLegacyResizeVariants(t *testing.T) {
 	imagesDir := t.TempDir()
 	resized := filepath.Join(imagesDir, imageResizeCacheSubdir)
@@ -188,7 +187,7 @@ func TestPruneImageCachePoolsDropsLegacyResizeVariants(t *testing.T) {
 	writePoolFile(t, current, 400, time.Now())
 	writePoolFile(t, other, 400, time.Now())

-	pools := ImageCachePools(imagesDir, 0, 0)
+	pools := ImageCachePools(imagesDir, 0)
 	res, err := PruneImageCachePools(pools, 0)
 	if err != nil {
 		t.Fatalf("prune failed: %v", err)
@@ -201,8 +200,8 @@ func TestPruneImageCachePoolsDropsLegacyResizeVariants(t *testing.T) {
 	}
 }

-// TestPruneImageCachePoolsCountsLegacyFlatLayout ??????images/ ????
-// ?????????????????
+// TestPruneImageCachePoolsCountsLegacyFlatLayout ???????images/ ???
+// ???????????????????????
 func TestPruneImageCachePoolsCountsLegacyFlatLayout(t *testing.T) {
 	imagesDir := t.TempDir()
 	legacy := filepath.Join(imagesDir, "legacy-flat-cache")
@@ -210,7 +209,8 @@ func TestPruneImageCachePoolsCountsLegacyFlatLayout(t *testing.T) {
 	writePoolFile(t, legacy, 900, time.Now().Add(-30*24*time.Hour))
 	writePoolFile(t, thumb, 900, time.Now().Add(-30*24*time.Hour))

-	pools := ImageCachePools(imagesDir, 0, 24*time.Hour)
+	// ???? 500??????????????????????????
+	pools := ImageCachePools(imagesDir, 500)
 	res, err := PruneImageCachePools(pools, 0)
 	if err != nil {
 		t.Fatalf("prune failed: %v", err)
@@ -134,7 +134,7 @@ func TestPruneImageCache_ZeroOrNegativeLimit(t *testing.T) {
 	}
 }

-func TestSchedulerJobCleanImageCache(t *testing.T) {
+func TestSchedulerJobCleanCache(t *testing.T) {
 	cacheRoot := t.TempDir()
 	imagesDir := filepath.Join(cacheRoot, "images")
 	if err := os.MkdirAll(imagesDir, 0o750); err != nil {
@@ -148,15 +148,117 @@ func TestSchedulerJobCleanImageCache(t *testing.T) {

 	scheduler := NewSchedulerService(zap.NewNop(), nil, nil, nil, nil, nil, cacheRoot)
 	// Set limit to 1MB; our file is 2MB -> should be pruned
-	scheduler.SetImageCachePolicyProvider(func() ImageCachePolicy {
-		return ImageCachePolicy{TotalBytes: 1 * 1024 * 1024}
+	scheduler.SetCacheCleanupPolicyProvider(func() CacheCleanupPolicy {
+		return CacheCleanupPolicy{TotalBytes: 1 * 1024 * 1024}
 	})

-	if err := scheduler.jobCleanImageCache(context.Background()); err != nil {
-		t.Fatalf("jobCleanImageCache failed: %v", err)
+	if err := scheduler.jobCleanCache(context.Background()); err != nil {
+		t.Fatalf("jobCleanCache failed: %v", err)
 	}

 	if _, err := os.Stat(f); !os.IsNotExist(err) {
 		t.Fatalf("expected file to be pruned, got err=%v", err)
 	}
 }
+
+// TestPruneCacheEvictionOrder 验证总量超限时严格按
+// hls → images → library-covers 的顺序淘汰，且 reader-audio 不参与。
+func TestPruneCacheEvictionOrder(t *testing.T) {
+	cacheRoot := t.TempDir()
+	now := time.Now()
+
+	audio := filepath.Join(cacheRoot, "reader-audio", "old.mp3")
+	hls := filepath.Join(cacheRoot, "hls", "job", "seg.ts")
+	image := filepath.Join(cacheRoot, "images", "originals", "poster.jpg")
+	cover := filepath.Join(cacheRoot, "library-covers", "cover.jpg")
+	for _, p := range []string{audio, hls, image, cover} {
+		writePoolFile(t, p, 1024*1024, now.Add(-time.Hour))
+	}
+
+	// 计入总量的只有 hls+images+cover = 3MB，上限 2MB -> 回落到 1.6MB：
+	// 按顺序删 hls、images 两个文件即可；reader-audio 与封面都应保留。
+	res, err := PruneCache(cacheRoot, 2*1024*1024, 0)
+	if err != nil {
+		t.Fatalf("prune failed: %v", err)
+	}
+	if res.DeletedFiles != 2 {
+		t.Fatalf("deleted files = %d, want 2", res.DeletedFiles)
+	}
+	mustExist(t, audio)
+	mustNotExist(t, hls)
+	mustNotExist(t, image)
+	mustExist(t, cover)
+	if _, ok := res.FreedByPool["reader-audio"]; ok {
+		t.Fatalf("reader-audio must not be part of the global pool, got %+v", res.FreedByPool)
+	}
+	if res.FreedByPool["hls"] != 1024*1024 || res.FreedByPool["images"] != 1024*1024 {
+		t.Fatalf("unexpected per-pool stats: %+v", res.FreedByPool)
+	}
+}
+
+// TestPruneCacheLeavesReaderAudioAlone reader-audio 有独立的 1GB 写入时淘汰，
+// 不参与总容量统计：即使它单独就超过全局上限，全局任务也不应删它。
+func TestPruneCacheLeavesReaderAudioAlone(t *testing.T) {
+	cacheRoot := t.TempDir()
+	audio := filepath.Join(cacheRoot, "reader-audio", "book", "chapter.mp3")
+	writePoolFile(t, audio, 4*1024*1024, time.Now().Add(-time.Hour))
+
+	res, err := PruneCache(cacheRoot, 1*1024*1024, 0)
+	if err != nil {
+		t.Fatalf("prune failed: %v", err)
+	}
+	if res.DeletedFiles != 0 {
+		t.Fatalf("deleted files = %d, want 0", res.DeletedFiles)
+	}
+	if res.TotalBytesBefore != 0 {
+		t.Fatalf("reader-audio should not count toward total, got %d bytes", res.TotalBytesBefore)
+	}
+	mustExist(t, audio)
+}
+
+// TestPruneCacheAppliesOriginalsSubQuota 验证总量没超时，图片原图子配额仍然生效。
+func TestPruneCacheAppliesOriginalsSubQuota(t *testing.T) {
+	cacheRoot := t.TempDir()
+	now := time.Now()
+
+	oldOriginal := filepath.Join(cacheRoot, "images", "originals", "old.jpg")
+	newOriginal := filepath.Join(cacheRoot, "images", "originals", "new.jpg")
+	derived := currentVariantPath(filepath.Join(cacheRoot, "images", "resize"), "d", 480, 600, 80)
+	writePoolFile(t, oldOriginal, 800, now.Add(-2*time.Hour))
+	writePoolFile(t, newOriginal, 800, now.Add(-time.Hour))
+	writePoolFile(t, derived, 800, now.Add(-time.Hour))
+
+	// 总量上限很大（不触发全局淘汰），原图子配额 1000B -> 删到 800B。
+	res, err := PruneCache(cacheRoot, 100*1024*1024, 1000)
+	if err != nil {
+		t.Fatalf("prune failed: %v", err)
+	}
+	if res.DeletedFiles != 1 {
+		t.Fatalf("deleted files = %d, want 1", res.DeletedFiles)
+	}
+	mustNotExist(t, oldOriginal)
+	mustExist(t, newOriginal)
+	mustExist(t, derived)
+}
+
+// TestPruneCacheOldestFirstWithinPool 验证同一池内先删最旧的文件。
+func TestPruneCacheOldestFirstWithinPool(t *testing.T) {
+	cacheRoot := t.TempDir()
+	now := time.Now()
+
+	oldHLS := filepath.Join(cacheRoot, "hls", "job-a", "seg1.ts")
+	newHLS := filepath.Join(cacheRoot, "hls", "job-b", "seg1.ts")
+	writePoolFile(t, oldHLS, 1024*1024, now.Add(-2*time.Hour))
+	writePoolFile(t, newHLS, 1024*1024, now.Add(-time.Minute))
+
+	// 上限 1.25MB -> 回落水位 1MB：删掉最旧的 1MB 后正好达标。
+	res, err := PruneCache(cacheRoot, 1280*1024, 0)
+	if err != nil {
+		t.Fatalf("prune failed: %v", err)
+	}
+	if res.DeletedFiles != 1 {
+		t.Fatalf("deleted files = %d, want 1", res.DeletedFiles)
+	}
+	mustNotExist(t, oldHLS)
+	mustExist(t, newHLS)
+}
@@ -8,8 +8,10 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"mime/multipart"
 	"net/http"
 	"net/url"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -130,14 +132,24 @@ type RespBase struct {

 // doJSON 执行 HTTP 请求并解析为统一响应；带 AccessToken（access=true 时）。
 func (c *OpenClient) doJSON(ctx context.Context, method, rawURL string, form map[string]string, access bool, retries int, uas ...string) (*RespBase, error) {
-	executor := c.executor
-	if executor == nil {
-		executor = GetGlobalExecutor()
-	}
 	ua := ""
 	if len(uas) > 0 {
 		ua = uas[0]
 	}
+	return c.doJSONWithBuilder(ctx, func() (*http.Request, error) {
+		return c.buildRequestWithUA(ctx, method, rawURL, form, access, ua)
+	}, access, retries)
+}
+
+// doJSONWithBuilder 与 doJSON 共用同一套限流、重试、令牌刷新与错误封装逻辑，
+// 差别只在请求构造方式：urlencoded（doJSON）、multipart（doAuthMultipart）。
+// 云下载（offline）系列接口要求 multipart/form-data，若各写一套请求循环，
+// 限流熔断与 token 轮转的处理迟早会漂移。
+func (c *OpenClient) doJSONWithBuilder(ctx context.Context, build func() (*http.Request, error), access bool, retries int) (*RespBase, error) {
+	executor := c.executor
+	if executor == nil {
+		executor = GetGlobalExecutor()
+	}

 	var lastErr error
 	for attempt := 0; attempt <= retries; attempt++ {
@@ -146,7 +158,7 @@ func (c *OpenClient) doJSON(ctx context.Context, method, rawURL string, form map
 			return nil, err
 		}

-		req, err := c.buildRequestWithUA(ctx, method, rawURL, form, access, ua)
+		req, err := build()
 		if err != nil {
 			return nil, err
 		}
@@ -293,6 +305,45 @@ func (c *OpenClient) buildRequestWithUA(ctx context.Context, method, rawURL stri
 	return req, nil
 }

+// buildMultipartRequest 构造 multipart/form-data 请求。
+// 115 云下载（offline）系列写接口要求 multipart/form-data，与其它接口的
+// urlencoded 表单不同；这里只支持纯文本字段（不含文件），种子文件走上传接口。
+func (c *OpenClient) buildMultipartRequest(ctx context.Context, method, rawURL string, fields map[string]string) (*http.Request, error) {
+	var buf bytes.Buffer
+	w := multipart.NewWriter(&buf)
+	// 固定字段顺序，便于抓包比对与排障（map 遍历顺序随机）。
+	keys := make([]string, 0, len(fields))
+	for k := range fields {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	for _, k := range keys {
+		if err := w.WriteField(k, fields[k]); err != nil {
+			return nil, err
+		}
+	}
+	if err := w.Close(); err != nil {
+		return nil, err
+	}
+	req, err := http.NewRequestWithContext(ctx, strings.ToUpper(method), rawURL, &buf)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("User-Agent", DefaultUA)
+	req.Header.Set("Content-Type", w.FormDataContentType())
+	if accessToken := c.currentAccessToken(); accessToken != "" {
+		req.Header.Set("Authorization", "Bearer "+accessToken)
+	}
+	return req, nil
+}
+
+// doAuthMultipart 以 multipart/form-data 发起需要 access_token 的请求。
+func (c *OpenClient) doAuthMultipart(ctx context.Context, method, rawURL string, fields map[string]string, retries int) (*RespBase, error) {
+	return c.doJSONWithBuilder(ctx, func() (*http.Request, error) {
+		return c.buildMultipartRequest(ctx, method, rawURL, fields)
+	}, true, retries)
+}
+
 // doAuthJSON 带 AccessToken 的业务请求。
 func (c *OpenClient) doAuthJSON(ctx context.Context, method, rawURL string, form map[string]string, retries int) (*RespBase, error) {
 	return c.doJSON(ctx, method, rawURL, form, true, retries)
@@ -0,0 +1,303 @@
+// 115 开放平台「云下载」（离线下载）API 封装。
+//
+// 文档（仓库内离线副本）：115doc/115开放平台/API列表/云下载/
+//
+// 能力边界（已核对官方文档，勿凭客户端印象假设）：
+//   - add_task_urls 支持 HTTP(S)/FTP/磁力/电驴，一次最多 115 条，无「选择文件」参数；
+//   - 选择文件只能走 BT 路径：torrent（解析已上传种子）→ add_task_bt（wanted 传索引）；
+//   - torrent 的入参是「种子文件在 115 的 SHA1 + 提取码」，不接受 magnet。
+//
+// 本文件只做协议封装：不碰数据库、不做编排、不判断业务状态，方便单测。
+package cloud115
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"strings"
+)
+
+// 云下载接口路径。
+const (
+	OfflinePathAddTaskURLs = "/open/offline/add_task_urls"
+	OfflinePathTorrent     = "/open/offline/torrent"
+	OfflinePathAddTaskBT   = "/open/offline/add_task_bt"
+	OfflinePathTaskList    = "/open/offline/get_task_list"
+	OfflinePathQuotaInfo   = "/open/offline/get_quota_info"
+	OfflinePathDelTask     = "/open/offline/del_task"
+	OfflinePathClearTask   = "/open/offline/clear_task"
+)
+
+// OfflineMaxURLsPerBatch 是 add_task_urls 单批链接上限（官方文档：1000011 超 115 个）。
+const OfflineMaxURLsPerBatch = 115
+
+// 云下载业务错误码。
+const (
+	OfflineCodeOK              = 0
+	OfflineCodeQuotaUsedUp     = 1000012 // 云下载配额已用完
+	OfflineCodeStorageFull     = 91006   // 存储空间不足
+	OfflineCodeTorrentMissing  = 20018   // 文件不存在或已删除（种子无效）
+	OfflineCodeTooManyURLs     = 1000011 // 链接数量超过 115 个
+	OfflineCodeParamError      = 990002  // 参数错误
+	OfflineCodeOperationFailed = 980004  // 操作失败，可重试
+)
+
+// 云下载任务状态（get_task_list → data.tasks[].status）。
+const (
+	OfflineTaskStatusFailed      = -1 // 下载失败
+	OfflineTaskStatusAllocating  = 0  // 分配中
+	OfflineTaskStatusDownloading = 1  // 下载中
+	OfflineTaskStatusDone        = 2  // 下载成功
+)
+
+// 清空任务的类型（clear_task → flag）。
+const (
+	OfflineClearDone         = 0
+	OfflineClearAll          = 1
+	OfflineClearFailed       = 2
+	OfflineClearRunning      = 3
+	OfflineClearDoneWithFile = 4
+	OfflineClearAllWithFile  = 5
+)
+
+// OfflineTaskURLResult 是 add_task_urls 返回的逐条结果。
+type OfflineTaskURLResult struct {
+	State    bool   `json:"state"`
+	Code     int    `json:"code"`
+	Message  string `json:"message"`
+	InfoHash string `json:"info_hash"`
+	URL      string `json:"url"`
+}
+
+// OfflineTorrentFile 是种子解析结果中的单个文件。
+type OfflineTorrentFile struct {
+	Size   int64  `json:"size"`
+	Path   string `json:"path"`
+	Wanted int    `json:"wanted"` // 115 认为该文件是否默认选中
+}
+
+// OfflineTorrentInfo 是 /offline/torrent 的解析结果。
+type OfflineTorrentInfo struct {
+	FileSize  int64                `json:"file_size"`
+	Name      string               `json:"torrent_name"`
+	FileCount int                  `json:"file_count"`
+	InfoHash  string               `json:"info_hash"`
+	Files     []OfflineTorrentFile `json:"torrent_filelist"`
+}
+
+// OfflineTask 是云下载任务列表中的一条任务。
+type OfflineTask struct {
+	InfoHash     string `json:"info_hash"`
+	AddTime      int64  `json:"add_time"`
+	PercentDone  int    `json:"percentDone"` // 注意：官方字段是驼峰，其余为 snake_case
+	Size         int64  `json:"size"`
+	Name         string `json:"name"`
+	LastUpdate   int64  `json:"last_update"`
+	FileID       string `json:"file_id"`
+	DeleteFileID string `json:"delete_file_id"`
+	Status       int    `json:"status"`
+	URL          string `json:"url"`
+	WpPathID     string `json:"wp_path_id"`
+	Def2         int    `json:"def2"`
+	PlayLong     int    `json:"play_long"`
+	CanAppeal    int    `json:"can_appeal"`
+}
+
+// OfflineTaskPage 是分页任务列表。
+type OfflineTaskPage struct {
+	Page      int           `json:"page"`
+	PageCount int           `json:"page_count"`
+	Count     int           `json:"count"`
+	Tasks     []OfflineTask `json:"tasks"`
+}
+
+// OfflineQuotaPackage 是某一类配额的使用情况。
+type OfflineQuotaPackage struct {
+	Surplus    int                  `json:"surplus"`
+	Used       int                  `json:"used"`
+	Count      int                  `json:"count"`
+	Name       string               `json:"name"`
+	ExpireInfo []OfflineQuotaExpire `json:"expire_info"`
+}
+
+// OfflineQuotaExpire 是配额过期明细。
+type OfflineQuotaExpire struct {
+	Surplus    int   `json:"surplus"`
+	ExpireTime int64 `json:"expire_time"`
+}
+
+// OfflineQuota 是云下载配额总览。
+type OfflineQuota struct {
+	Package []OfflineQuotaPackage `json:"package"`
+	Count   int                   `json:"count"`
+	Surplus int                   `json:"surplus"`
+	Used    int                   `json:"used"`
+}
+
+// OfflineBTRequest 是 add_task_bt 的请求参数。
+type OfflineBTRequest struct {
+	InfoHash    string
+	Wanted      string // 半角逗号分隔的文件索引；官方文档：「可以为 0，但不能为空」
+	SavePath    string // 相对 wp_path_id 的保存路径，可为空
+	TorrentSha1 string
+	PickCode    string
+	WpPathID    string
+}
+
+// AddTaskURLs 批量添加链接任务（HTTP/FTP/磁力/电驴），单批 ≤115 条。
+// 返回逐条结果：整体请求成功但个别链接失败是常态，调用方必须逐条判断 State。
+// 注意：data[].info_hash 只在受理成功时才有值，链接类任务可能为空。
+func (c *OpenClient) AddTaskURLs(ctx context.Context, urls []string, wpPathID string) ([]OfflineTaskURLResult, error) {
+	cleaned := make([]string, 0, len(urls))
+	for _, u := range urls {
+		if u = strings.TrimSpace(u); u != "" {
+			cleaned = append(cleaned, u)
+		}
+	}
+	if len(cleaned) == 0 {
+		return nil, fmt.Errorf("115: 云下载链接为空")
+	}
+	if len(cleaned) > OfflineMaxURLsPerBatch {
+		return nil, fmt.Errorf("115: 单批云下载链接最多 %d 条，当前 %d 条", OfflineMaxURLsPerBatch, len(cleaned))
+	}
+	if wpPathID = strings.TrimSpace(wpPathID); wpPathID == "" {
+		wpPathID = "0"
+	}
+	fields := map[string]string{
+		"urls":       strings.Join(cleaned, "\n"),
+		"wp_path_id": wpPathID,
+	}
+	resp, err := c.doAuthMultipart(ctx, "POST", ProAPIBase+OfflinePathAddTaskURLs, fields, 1)
+	if err != nil {
+		return nil, err
+	}
+	var results []OfflineTaskURLResult
+	if err := unmarshalOfflineData(resp, &results); err != nil {
+		return nil, err
+	}
+	return results, nil
+}
+
+// ParseTorrent 解析已上传到 115 的 BT 种子文件。
+// torrentSha1/pickCode 必须来自该账号空间内的种子文件（上传接口返回值）。
+func (c *OpenClient) ParseTorrent(ctx context.Context, torrentSha1, pickCode string) (*OfflineTorrentInfo, error) {
+	torrentSha1 = strings.TrimSpace(torrentSha1)
+	pickCode = strings.TrimSpace(pickCode)
+	if torrentSha1 == "" || pickCode == "" {
+		return nil, fmt.Errorf("115: 解析种子需要 torrent_sha1 与 pick_code")
+	}
+	fields := map[string]string{
+		"torrent_sha1": torrentSha1,
+		"pick_code":    pickCode,
+	}
+	resp, err := c.doAuthMultipart(ctx, "POST", ProAPIBase+OfflinePathTorrent, fields, 1)
+	if err != nil {
+		return nil, err
+	}
+	var info OfflineTorrentInfo
+	if err := unmarshalOfflineData(resp, &info); err != nil {
+		return nil, err
+	}
+	return &info, nil
+}
+
+// AddTaskBT 根据已解析的种子添加云下载 BT 任务。
+// wanted 传文件索引（半角逗号分隔）；官方文档允许传 "0"，但语义未在文档中写明，
+// 因此调用方应优先传解析结果推导出的索引列表（见 service 层）。
+func (c *OpenClient) AddTaskBT(ctx context.Context, req OfflineBTRequest) error {
+	infoHash := strings.TrimSpace(req.InfoHash)
+	torrentSha1 := strings.TrimSpace(req.TorrentSha1)
+	pickCode := strings.TrimSpace(req.PickCode)
+	if infoHash == "" || torrentSha1 == "" || pickCode == "" {
+		return fmt.Errorf("115: 添加 BT 任务缺少 info_hash/torrent_sha1/pick_code")
+	}
+	wanted := strings.TrimSpace(req.Wanted)
+	if wanted == "" {
+		wanted = "0"
+	}
+	wpPathID := strings.TrimSpace(req.WpPathID)
+	if wpPathID == "" {
+		wpPathID = "0"
+	}
+	fields := map[string]string{
+		"info_hash":    infoHash,
+		"wanted":       wanted,
+		"save_path":    strings.TrimSpace(req.SavePath),
+		"torrent_sha1": torrentSha1,
+		"pick_code":    pickCode,
+		"wp_path_id":   wpPathID,
+	}
+	if _, err := c.doAuthMultipart(ctx, "POST", ProAPIBase+OfflinePathAddTaskBT, fields, 1); err != nil {
+		return err
+	}
+	return nil
+}
+
+// GetOfflineTaskList 分页获取云下载任务列表（page 从 1 开始）。
+func (c *OpenClient) GetOfflineTaskList(ctx context.Context, page int) (*OfflineTaskPage, error) {
+	if page < 1 {
+		page = 1
+	}
+	resp, err := c.doAuthJSON(ctx, "GET", ProAPIBase+OfflinePathTaskList, map[string]string{
+		"page": fmt.Sprint(page),
+	}, 1)
+	if err != nil {
+		return nil, err
+	}
+	var list OfflineTaskPage
+	if err := unmarshalOfflineData(resp, &list); err != nil {
+		return nil, err
+	}
+	return &list, nil
+}
+
+// GetOfflineQuota 获取云下载配额信息。
+func (c *OpenClient) GetOfflineQuota(ctx context.Context) (*OfflineQuota, error) {
+	resp, err := c.doAuthJSON(ctx, "GET", ProAPIBase+OfflinePathQuotaInfo, nil, 1)
+	if err != nil {
+		return nil, err
+	}
+	var quota OfflineQuota
+	if err := unmarshalOfflineData(resp, &quota); err != nil {
+		return nil, err
+	}
+	return &quota, nil
+}
+
+// DeleteOfflineTask 删除指定云下载任务（按 info_hash）。
+// delSourceFile=true 时同时删除已下载的源文件。
+func (c *OpenClient) DeleteOfflineTask(ctx context.Context, infoHash string, delSourceFile bool) error {
+	infoHash = strings.TrimSpace(infoHash)
+	if infoHash == "" {
+		return fmt.Errorf("115: 删除云下载任务需要 info_hash")
+	}
+	del := "0"
+	if delSourceFile {
+		del = "1"
+	}
+	fields := map[string]string{
+		"info_hash":       infoHash,
+		"del_source_file": del,
+	}
+	_, err := c.doAuthMultipart(ctx, "POST", ProAPIBase+OfflinePathDelTask, fields, 1)
+	return err
+}
+
+// ClearOfflineTasks 按类型清空云下载任务。
+func (c *OpenClient) ClearOfflineTasks(ctx context.Context, flag int) error {
+	fields := map[string]string{"flag": fmt.Sprint(flag)}
+	_, err := c.doAuthMultipart(ctx, "POST", ProAPIBase+OfflinePathClearTask, fields, 1)
+	return err
+}
+
+// unmarshalOfflineData 解析 data 字段。115 的 /offline/* 接口在 state=true 时
+// 仍可能给出空 data（例如 add_task_bt 成功时 data 为空数组），调用方需容忍零值。
+func unmarshalOfflineData(resp *RespBase, out any) error {
+	if resp == nil || len(resp.Data) == 0 {
+		return nil
+	}
+	if err := json.Unmarshal(resp.Data, out); err != nil {
+		return fmt.Errorf("115: 解析云下载响应失败：%w", err)
+	}
+	return nil
+}
@@ -0,0 +1,170 @@
+package cloud115
+
+import (
+	"context"
+	"net/http"
+	"strings"
+	"testing"
+)
+
+// newOfflineTestClient 构造一个指向 mock server 的客户端。
+// 令牌直接写入内存字段，避免走文件/数据库。
+func newOfflineTestClient(accessToken string) *OpenClient {
+	return NewOpenClient("test-app", accessToken, "")
+}
+
+func TestAddTaskURLsUsesMultipartAndBatches(t *testing.T) {
+	mockAPI(t, func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != OfflinePathAddTaskURLs {
+			t.Errorf("unexpected path %s", r.URL.Path)
+		}
+		if r.Method != http.MethodPost {
+			t.Errorf("unexpected method %s", r.Method)
+		}
+		if ct := r.Header.Get("Content-Type"); !strings.HasPrefix(ct, "multipart/form-data") {
+			t.Errorf("expected multipart content-type, got %q", ct)
+		}
+		if got := r.Header.Get("Authorization"); !strings.HasPrefix(got, "Bearer ") || len(got) <= len("Bearer ") {
+			t.Errorf("unexpected authorization %q", got)
+		}
+		if err := r.ParseMultipartForm(1 << 20); err != nil {
+			t.Fatalf("parse multipart: %v", err)
+		}
+		if got := r.FormValue("wp_path_id"); got != "12345" {
+			t.Errorf("wp_path_id = %q, want 12345", got)
+		}
+		urls := r.FormValue("urls")
+		if want := "magnet:?xt=urn:btih:AAA\ned2k://|file|x|1|H|/"; urls != want {
+			t.Errorf("urls = %q, want %q", urls, want)
+		}
+		_, _ = w.Write([]byte(`{"state":true,"code":0,"data":[{"state":true,"code":0,"info_hash":"ABC","url":"magnet:?xt=urn:btih:AAA"}]}`))
+	})
+
+	client := newOfflineTestClient("token-abc")
+	res, err := client.AddTaskURLs(context.Background(), []string{
+		"  magnet:?xt=urn:btih:AAA  ",
+		"ed2k://|file|x|1|H|/",
+	}, "12345")
+	if err != nil {
+		t.Fatalf("AddTaskURLs: %v", err)
+	}
+	if len(res) != 1 || !res[0].State || res[0].InfoHash != "ABC" {
+		t.Fatalf("unexpected result %+v", res)
+	}
+}
+
+func TestAddTaskURLsRejectsOverLimitWithoutRequest(t *testing.T) {
+	called := false
+	mockAPI(t, func(w http.ResponseWriter, r *http.Request) {
+		called = true
+	})
+	urls := make([]string, OfflineMaxURLsPerBatch+1)
+	for i := range urls {
+		urls[i] = "https://example.com/a"
+	}
+	if _, err := newOfflineTestClient("t").AddTaskURLs(context.Background(), urls, "1"); err == nil {
+		t.Fatal("expected error for over-limit batch")
+	}
+	if called {
+		t.Fatal("must not call 115 when batch exceeds the documented limit")
+	}
+}
+
+func TestAddTaskURLsSurfacesBusinessError(t *testing.T) {
+	mockAPI(t, func(w http.ResponseWriter, r *http.Request) {
+		_, _ = w.Write([]byte(`{"state":false,"code":1000012,"message":"云下载配额已用完"}`))
+	})
+	_, err := newOfflineTestClient("t").AddTaskURLs(context.Background(), []string{"magnet:?xt=urn:btih:AAA"}, "1")
+	if err == nil {
+		t.Fatal("expected business error")
+	}
+	apiErr, ok := err.(*OpenAPIError)
+	if !ok {
+		t.Fatalf("expected *OpenAPIError, got %T", err)
+	}
+	if apiErr.Code != OfflineCodeQuotaUsedUp {
+		t.Fatalf("code = %d, want %d", apiErr.Code, OfflineCodeQuotaUsedUp)
+	}
+}
+
+func TestParseTorrentDecodesFileList(t *testing.T) {
+	mockAPI(t, func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != OfflinePathTorrent {
+			t.Errorf("unexpected path %s", r.URL.Path)
+		}
+		if err := r.ParseMultipartForm(1 << 20); err != nil {
+			t.Fatalf("parse multipart: %v", err)
+		}
+		if r.FormValue("torrent_sha1") != "SHA1" || r.FormValue("pick_code") != "PICK" {
+			t.Errorf("unexpected form: %v", r.MultipartForm.Value)
+		}
+		_, _ = w.Write([]byte(`{"state":true,"code":0,"data":{
+			"file_size":1024,"torrent_name":"Demo","file_count":2,"info_hash":"HASH",
+			"torrent_filelist":[{"size":512,"path":"a.mkv","wanted":1},{"size":512,"path":"b.srt","wanted":0}]}}`))
+	})
+	info, err := newOfflineTestClient("t").ParseTorrent(context.Background(), "SHA1", "PICK")
+	if err != nil {
+		t.Fatalf("ParseTorrent: %v", err)
+	}
+	if info.InfoHash != "HASH" || info.Name != "Demo" || len(info.Files) != 2 {
+		t.Fatalf("unexpected info %+v", info)
+	}
+	if info.Files[0].Path != "a.mkv" || info.Files[0].Size != 512 {
+		t.Fatalf("unexpected file %+v", info.Files[0])
+	}
+}
+
+func TestAddTaskBTRequiresSeedFields(t *testing.T) {
+	called := false
+	mockAPI(t, func(w http.ResponseWriter, r *http.Request) { called = true })
+	client := newOfflineTestClient("t")
+	if err := client.AddTaskBT(context.Background(), OfflineBTRequest{InfoHash: "H"}); err == nil {
+		t.Fatal("expected validation error")
+	}
+	if called {
+		t.Fatal("must validate locally before calling 115")
+	}
+}
+
+func TestGetOfflineTaskListParsesCamelCasePercentDone(t *testing.T) {
+	mockAPI(t, func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != OfflinePathTaskList {
+			t.Errorf("unexpected path %s", r.URL.Path)
+		}
+		if r.URL.Query().Get("page") != "2" {
+			t.Errorf("page = %q, want 2", r.URL.Query().Get("page"))
+		}
+		_, _ = w.Write([]byte(`{"state":true,"code":0,"data":{"page":2,"page_count":3,"count":30,
+			"tasks":[{"info_hash":"H","percentDone":42,"size":100,"name":"n","status":1,"url":"u","wp_path_id":"9"}]}}`))
+	})
+	page, err := newOfflineTestClient("t").GetOfflineTaskList(context.Background(), 2)
+	if err != nil {
+		t.Fatalf("GetOfflineTaskList: %v", err)
+	}
+	if page.Page != 2 || page.PageCount != 3 || len(page.Tasks) != 1 {
+		t.Fatalf("unexpected page %+v", page)
+	}
+	// 官方字段是驼峰 percentDone：写成 snake_case 会永远 0，这里必须锁死。
+	if page.Tasks[0].PercentDone != 42 {
+		t.Fatalf("percentDone = %d, want 42", page.Tasks[0].PercentDone)
+	}
+	if page.Tasks[0].Status != OfflineTaskStatusDownloading {
+		t.Fatalf("status = %d", page.Tasks[0].Status)
+	}
+}
+
+func TestGetOfflineQuota(t *testing.T) {
+	mockAPI(t, func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != OfflinePathQuotaInfo {
+			t.Errorf("unexpected path %s", r.URL.Path)
+		}
+		_, _ = w.Write([]byte(`{"state":true,"code":0,"data":{"package":[{"surplus":3,"used":1,"count":4,"name":"p"}],"count":4,"surplus":3,"used":1}}`))
+	})
+	q, err := newOfflineTestClient("t").GetOfflineQuota(context.Background())
+	if err != nil {
+		t.Fatalf("GetOfflineQuota: %v", err)
+	}
+	if q.Surplus != 3 || q.Count != 4 || len(q.Package) != 1 {
+		t.Fatalf("unexpected quota %+v", q)
+	}
+}
@@ -0,0 +1,33 @@
+package service
+
+import (
+	"context"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestCloud115HLSChildRejectsMismatchedSessionMediaBeforeFetch(t *testing.T) {
+	fetched := false
+	proxy := &Cloud115HLSProxy{sessions: map[string]*cloud115HLSSession{}}
+	proxy.client = &http.Client{Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		fetched = true
+		return &http.Response{StatusCode: http.StatusOK, Header: http.Header{"Content-Type": []string{"video/mp2t"}}, Body: io.NopCloser(strings.NewReader("private-segment")), Request: req}, nil
+	})}
+	proxy.sessions["session-b"] = &cloud115HLSSession{
+		ID: "session-b", MediaID: "media-b", ExpiresAt: time.Now().Add(time.Hour),
+		entries: map[string]string{"segment": "https://cpats01.115.com/seg.ts"},
+	}
+	for _, query := range []string{"?media_id=media-a", ""} {
+		fetched = false
+		req := httptest.NewRequest(http.MethodGet, "/api/cloud115/hls/session-b/segment"+query, nil)
+		rec := httptest.NewRecorder()
+		err := proxy.ServeChild(context.Background(), rec, req, "session-b", "segment")
+		if err == nil || fetched {
+			t.Errorf("query %q must reject the wrong/missing media before fetch; err=%v fetched=%v", query, err, fetched)
+		}
+	}
+}
@@ -20,8 +20,9 @@ import (
 )

 var (
-	ErrCloud115HLSSessionNotFound = errors.New("115 hls session not found")
-	ErrCloud115HLSUpstreamExpired = errors.New("115 hls upstream expired")
+	ErrCloud115HLSSessionNotFound      = errors.New("115 hls session not found")
+	ErrCloud115HLSUpstreamExpired      = errors.New("115 hls upstream expired")
+	ErrCloud115HLSSessionMediaMismatch = errors.New("115 hls session media mismatch")
 )

 const (
@@ -131,6 +132,9 @@ func (p *Cloud115HLSProxy) ServeChild(ctx context.Context, w http.ResponseWriter
 	if !ok {
 		return ErrCloud115HLSSessionNotFound
 	}
+	if r == nil || strings.TrimSpace(r.URL.Query().Get("media_id")) != session.MediaID {
+		return ErrCloud115HLSSessionMediaMismatch
+	}
 	resp, err := p.fetchUpstream(ctx, upstream, r.Header.Get("Range"))
 	if err != nil {
 		return err
@@ -186,6 +190,15 @@ func (p *Cloud115HLSProxy) ServeChild(ctx context.Context, w http.ResponseWriter
 	return err
 }

+// SessionMediaID resolves the server-owned media identity before handler authorization.
+func (p *Cloud115HLSProxy) SessionMediaID(sessionID, key string) (string, error) {
+	session, _, ok := p.lookup(sessionID, key)
+	if !ok {
+		return "", ErrCloud115HLSSessionNotFound
+	}
+	return session.MediaID, nil
+}
+
 func (p *Cloud115HLSProxy) newSession(mediaID string, definition int) *cloud115HLSSession {
 	now := time.Now()
 	return &cloud115HLSSession{
@@ -104,11 +104,13 @@ func (s *Cloud115PlaybackService) HLSProxy() *Cloud115HLSProxy {
 	return s.proxy
 }

-// PlaybackInfo 返回媒体在 direct/115-cloud/local 三种模式下的能力描述。
-//
-// requestedDefinition 为空或 0 时默认选择 1080P；该档位不可用时返回
-// transcoding 状态（并只触发一次加速转码，避免轮询风暴）。
+// PlaybackInfo only reads direct/115-cloud/local playback capabilities.
+// Cloud work is queued exclusively by StartTranscode, never by polling.
 func (s *Cloud115PlaybackService) PlaybackInfo(ctx context.Context, mediaID string, requestedDefinition int) (*PlaybackInfo, error) {
+	return s.playbackInfo(ctx, mediaID, requestedDefinition, false)
+}
+
+func (s *Cloud115PlaybackService) playbackInfo(ctx context.Context, mediaID string, requestedDefinition int, startTranscode bool) (*PlaybackInfo, error) {
 	if s == nil || s.repo == nil || s.repo.Media == nil {
 		return nil, ErrMediaNotFound
 	}
@@ -179,13 +181,26 @@ func (s *Cloud115PlaybackService) PlaybackInfo(ctx context.Context, mediaID stri
 		return info, nil
 	}

-	info.Transcode = s.ensureCloudTranscode(ctx, account.ID, pickCode, selected, client)
+	if startTranscode {
+		info.Transcode = s.ensureCloudTranscode(ctx, account.ID, pickCode, selected, client)
+	} else {
+		info.Transcode = Cloud115TranscodeState{
+			State: "idle", Definition: selected.ID, Message: "该清晰度尚未就绪，可请求 115 云端转码", RetryAfterSec: 5,
+		}
+		s.mu.Lock()
+		if last, ok := s.pushState[account.ID+":"+pickCode]; ok {
+			info.Transcode.State = "transcoding"
+			info.Transcode.Message = last.message
+			info.Transcode.StartedAt = last.at.Unix()
+		}
+		s.mu.Unlock()
+	}
 	return info, nil
 }

 // StartTranscode 显式触发某个清晰度的云端转码，返回最新状态。
 func (s *Cloud115PlaybackService) StartTranscode(ctx context.Context, mediaID string, definition int) (*PlaybackInfo, error) {
-	return s.PlaybackInfo(ctx, mediaID, definition)
+	return s.playbackInfo(ctx, mediaID, definition, true)
 }

 // ResolveCloud115URL 返回指定清晰度的 115 云端 m3u8 地址。
@@ -258,6 +273,9 @@ func (s *Cloud115PlaybackService) ensureCloudTranscode(
 			}
 		}
 	}
+	// Reserve the in-flight attempt before releasing the lock. Two simultaneous
+	// explicit starts must not both submit a push while the first awaits 115.
+	s.pushState[key] = cloud115PushAttempt{at: now, message: "正在提交 115 云端转码请求…"}
 	s.mu.Unlock()

 	err := client.SubmitVideoPush(ctx, pickCode, "vip_push")
@@ -16,7 +16,7 @@ import (
 	"github.com/truewhile/MeBox/internal/service/cloud115"
 )

-func TestCloud115PlaybackInfoTriggersTranscodeOnce(t *testing.T) {
+func TestCloud115PlaybackInfoIsReadOnlyAndStartTriggersTranscodeOnce(t *testing.T) {
 	var playCalls int32
 	var pushCalls int32
 	var ready int32
@@ -93,9 +93,16 @@ func TestCloud115PlaybackInfoTriggersTranscodeOnce(t *testing.T) {
 	}
 	svc := NewCloud115PlaybackService(nil, zap.NewNop(), repos, strm)

-	info, err := svc.PlaybackInfo(ctx, media.ID, 0)
+	if _, err := svc.PlaybackInfo(ctx, media.ID, 0); err != nil {
+		t.Fatalf("read playback info: %v", err)
+	}
+	if got := atomic.LoadInt32(&pushCalls); got != 0 {
+		t.Fatalf("read-only playback info triggered %d cloud transcode pushes", got)
+	}
+
+	info, err := svc.StartTranscode(ctx, media.ID, 0)
 	if err != nil {
-		t.Fatalf("first playback info: %v", err)
+		t.Fatalf("start transcode: %v", err)
 	}
 	if info.Provider != model.StrmProvider115 || info.DefaultQuality != "4" {
 		t.Fatalf("unexpected playback info: %#v", info)
@@ -0,0 +1,77 @@
+package service
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/service/cloud115"
+)
+
+func TestCloud115ConcurrentStartsDoNotDuplicateInFlightPush(t *testing.T) {
+	started := make(chan struct{})
+	release := make(chan struct{})
+	var releaseOnce sync.Once
+	var pushCalls atomic.Int32
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if pushCalls.Add(1) == 1 {
+			close(started)
+		}
+		<-release
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(map[string]any{"state": true, "code": 0, "data": []any{}})
+	}))
+	defer server.Close()
+	defer releaseOnce.Do(func() { close(release) })
+	oldBase := cloud115.ProAPIBase
+	cloud115.ProAPIBase = server.URL
+	defer func() { cloud115.ProAPIBase = oldBase }()
+	client := cloud115.NewOpenClient("review-app", "access", "refresh")
+	svc := NewCloud115PlaybackService(nil, zap.NewNop(), nil, nil)
+	quality := PlaybackQuality{ID: "4", Label: "1080P", Source: "cloud"}
+	ctx, cancel := context.WithTimeout(t.Context(), 5*time.Second)
+	defer cancel()
+	first := make(chan struct{})
+	go func() { defer close(first); svc.ensureCloudTranscode(ctx, "account", "pick", quality, client) }()
+	select {
+	case <-started:
+	case <-ctx.Done():
+		t.Fatal("first push did not reach the local server")
+	}
+	second := make(chan Cloud115TranscodeState, 1)
+	go func() { second <- svc.ensureCloudTranscode(ctx, "account", "pick", quality, client) }()
+	secondReceived := false
+	select {
+	case state := <-second:
+		secondReceived = true
+		if state.State != "transcoding" {
+			t.Errorf("in-flight request should be reported as transcoding: %#v", state)
+		}
+	case <-time.After(250 * time.Millisecond):
+		t.Error("second start issued another request instead of reusing the in-flight push")
+	}
+	releaseOnce.Do(func() { close(release) })
+	select {
+	case <-first:
+	case <-ctx.Done():
+		t.Fatal("first push did not finish")
+	}
+	// The duplicate path is awaited before restoring the package-wide fake API.
+	if !secondReceived {
+		select {
+		case <-second:
+		case <-ctx.Done():
+			t.Fatal("second start did not finish")
+		}
+	}
+	if got := pushCalls.Load(); got != 1 {
+		t.Fatalf("pushes=%d, want 1", got)
+	}
+}
@@ -0,0 +1,433 @@
+// 115 云下载（离线下载）服务：提交链接、轮询 115 任务、驱动后处理管线
+// （STRM 增量同步 → 媒体库扫描 → 自动刮削）。
+//
+// 职责边界：
+//   - 115 协议细节在 internal/service/cloud115/offline.go；
+//   - 本服务只做编排与状态机，不直接写 .strm 文件、不直接解析媒体；
+//   - 115 客户端必须经 StrmService.Open115Client 取得，禁止自建（见该方法注释）。
+package service
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/helper"
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+	"github.com/truewhile/MeBox/internal/service/cloud115"
+)
+
+// 云下载设置键（存于 Setting 表，cloud_download.* 前缀）。
+const (
+	CloudDownloadSettingPollInterval = "cloud_download.poll_interval_sec"
+	CloudDownloadSettingSyncDebounce = "cloud_download.sync_debounce_sec"
+	CloudDownloadSettingAutoScrape   = "cloud_download.auto_scrape"
+	CloudDownloadSettingTimeoutHours = "cloud_download.task_timeout_hours"
+	CloudDownloadSettingTorrentMaxMB = "cloud_download.torrent_max_mb"
+	CloudDownloadSettingMaxPages     = "cloud_download.max_pages"
+)
+
+// 默认值与取值范围。
+const (
+	cloudDownloadDefaultPollInterval = 60
+	cloudDownloadDefaultDebounce     = 30
+	cloudDownloadDefaultTimeoutHours = 72
+	cloudDownloadDefaultTorrentMaxMB = 20
+	cloudDownloadDefaultMaxPages     = 10
+
+	cloudDownloadMinPollInterval = 30
+	cloudDownloadMaxPollInterval = 600
+	cloudDownloadMaxDebounce     = 300
+
+	// cloudDownloadPipelineTick 是后处理推进的扫描周期（去抖窗口以秒计，
+	// 15s 足够把「等窗口结束」的延迟控制在可接受范围）。
+	cloudDownloadPipelineTick = 15 * time.Second
+
+	// cloudDownloadTorrentTempPrefix 是种子临时文件前缀（上传后立即删除）。
+	cloudDownloadTorrentTempPrefix = "mebox-clouddl-"
+)
+
+// CloudDownloadService 提供云下载任务的全生命周期管理。
+type CloudDownloadService struct {
+	log     *zap.Logger
+	repo    *repository.Container
+	strm    *StrmService
+	scanner *ScannerService
+	scraper *ScraperService
+
+	stopOnce sync.Once
+	stopCh   chan struct{}
+	baseCtx  context.Context
+
+	// 去抖状态：同一同步目录在窗口内的多次完成合并成一次同步。
+	debounceMu  sync.Mutex
+	lastTrigger map[string]time.Time
+}
+
+// NewCloudDownloadService 构造云下载服务。
+// strm/scanner/scraper 必须已构造完成（见 service_builder 的装配顺序）。
+func NewCloudDownloadService(
+	log *zap.Logger,
+	repo *repository.Container,
+	strm *StrmService,
+	scanner *ScannerService,
+	scraper *ScraperService,
+) *CloudDownloadService {
+	return &CloudDownloadService{
+		log:         log,
+		repo:        repo,
+		strm:        strm,
+		scanner:     scanner,
+		scraper:     scraper,
+		stopCh:      make(chan struct{}),
+		baseCtx:     context.Background(),
+		lastTrigger: map[string]time.Time{},
+	}
+}
+
+// Start 启动后处理循环，并把上次进程退出时停在中间阶段的任务重置为待推进。
+func (s *CloudDownloadService) Start(ctx context.Context) {
+	s.baseCtx = ctx
+	if s.repo != nil && s.repo.CloudDownload != nil {
+		if n, err := s.repo.CloudDownload.ResetStaleStages(ctx); err != nil {
+			s.log.Warn("reset stale cloud download stages failed", zap.Error(err))
+		} else if n > 0 {
+			s.log.Info("cloud download stages reset after restart", zap.Int64("count", n))
+		}
+	}
+	helper.Go(s.log, "cloudDownload.pipelineLoop", func() {
+		ticker := time.NewTicker(cloudDownloadPipelineTick)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-s.stopCh:
+				return
+			case <-ticker.C:
+				s.runPipelineOnce(s.baseCtx)
+			}
+		}
+	})
+}
+
+// Stop 停止后处理循环。
+func (s *CloudDownloadService) Stop() {
+	s.stopOnce.Do(func() { close(s.stopCh) })
+}
+
+// ─── 设置读取 ─────────────────────────────────────────────────────────────────
+
+func (s *CloudDownloadService) settingInt(key string, fallback, min, max int) int {
+	if s.repo == nil || s.repo.Setting == nil {
+		return fallback
+	}
+	raw, err := s.repo.Setting.Get(context.Background(), key)
+	if err != nil || strings.TrimSpace(raw) == "" {
+		return fallback
+	}
+	v, err := strconv.Atoi(strings.TrimSpace(raw))
+	if err != nil {
+		return fallback
+	}
+	if v < min {
+		return min
+	}
+	if v > max {
+		return max
+	}
+	return v
+}
+
+func (s *CloudDownloadService) settingBool(key string, fallback bool) bool {
+	if s.repo == nil || s.repo.Setting == nil {
+		return fallback
+	}
+	raw, err := s.repo.Setting.Get(context.Background(), key)
+	if err != nil {
+		return fallback
+	}
+	switch strings.ToLower(strings.TrimSpace(raw)) {
+	case "":
+		return fallback
+	case "1", "true", "yes", "on", "enabled":
+		return true
+	default:
+		return false
+	}
+}
+
+// pollInterval 轮询 115 任务列表的间隔。
+func (s *CloudDownloadService) pollInterval() time.Duration {
+	sec := s.settingInt(CloudDownloadSettingPollInterval, cloudDownloadDefaultPollInterval,
+		cloudDownloadMinPollInterval, cloudDownloadMaxPollInterval)
+	return time.Duration(sec) * time.Second
+}
+
+// debounceWindow 同一同步目录的完成去抖窗口。
+func (s *CloudDownloadService) debounceWindow() time.Duration {
+	sec := s.settingInt(CloudDownloadSettingSyncDebounce, cloudDownloadDefaultDebounce, 0, cloudDownloadMaxDebounce)
+	return time.Duration(sec) * time.Second
+}
+
+// autoScrapeEnabled 是否在同步完成后自动刮削。
+func (s *CloudDownloadService) autoScrape() bool {
+	return s.settingBool(CloudDownloadSettingAutoScrape, true)
+}
+
+// taskTimeout 下载超时判定。
+func (s *CloudDownloadService) taskTimeout() time.Duration {
+	hours := s.settingInt(CloudDownloadSettingTimeoutHours, cloudDownloadDefaultTimeoutHours, 1, 24*30)
+	return time.Duration(hours) * time.Hour
+}
+
+// torrentMaxBytes 种子上传大小上限。
+func (s *CloudDownloadService) torrentMaxBytes() int64 {
+	mb := s.settingInt(CloudDownloadSettingTorrentMaxMB, cloudDownloadDefaultTorrentMaxMB, 1, 200)
+	return int64(mb) << 20
+}
+
+// maxPollPages 单轮轮询最多翻页数。
+func (s *CloudDownloadService) maxPollPages() int {
+	return s.settingInt(CloudDownloadSettingMaxPages, cloudDownloadDefaultMaxPages, 1, 100)
+}
+
+// ─── 查询与管理 ───────────────────────────────────────────────────────────────
+
+// CloudDownloadTaskView 是列表返回的任务视图（附带展示用的派生字段）。
+type CloudDownloadTaskView struct {
+	model.CloudDownloadTask
+	SyncPathName      string `json:"sync_path_name,omitempty"`
+	RemoteDisplayPath string `json:"remote_display_path,omitempty"`
+	LocalPath         string `json:"local_path,omitempty"`
+}
+
+// CloudDownloadList 是分页列表结果。
+type CloudDownloadList struct {
+	Items    []CloudDownloadTaskView `json:"items"`
+	Total    int64                   `json:"total"`
+	Page     int                     `json:"page"`
+	PageSize int                     `json:"page_size"`
+}
+
+// List 分页查询云下载任务，并补充同步目录的展示信息。
+func (s *CloudDownloadService) List(ctx context.Context, q repository.CloudDownloadQuery) (*CloudDownloadList, error) {
+	rows, total, err := s.repo.CloudDownload.List(ctx, q)
+	if err != nil {
+		return nil, err
+	}
+	paths := map[string]*model.StrmSyncPath{}
+	items := make([]CloudDownloadTaskView, 0, len(rows))
+	for i := range rows {
+		v := CloudDownloadTaskView{CloudDownloadTask: rows[i]}
+		if p, ok := paths[rows[i].SyncPathID]; ok {
+			if p != nil {
+				v.SyncPathName, v.RemoteDisplayPath, v.LocalPath = p.Name, p.RemoteDisplayPath, p.LocalPath
+			}
+		} else if s.repo.StrmSyncPath != nil {
+			p, err := s.repo.StrmSyncPath.FindByID(ctx, rows[i].SyncPathID)
+			if err == nil {
+				paths[rows[i].SyncPathID] = p
+				if p != nil {
+					v.SyncPathName, v.RemoteDisplayPath, v.LocalPath = p.Name, p.RemoteDisplayPath, p.LocalPath
+				}
+			}
+		}
+		items = append(items, v)
+	}
+	page := q.Page
+	if page < 1 {
+		page = 1
+	}
+	pageSize := q.PageSize
+	if pageSize <= 0 {
+		pageSize = 20
+	}
+	return &CloudDownloadList{Items: items, Total: total, Page: page, PageSize: pageSize}, nil
+}
+
+// Get 按 ID 取单条任务。
+func (s *CloudDownloadService) Get(ctx context.Context, id string) (*model.CloudDownloadTask, error) {
+	t, err := s.repo.CloudDownload.FindByID(ctx, id)
+	if err != nil {
+		return nil, err
+	}
+	if t == nil {
+		return nil, errors.New("云下载任务不存在")
+	}
+	return t, nil
+}
+
+// Cancel 取消任务：先尽力删除 115 侧任务，再把本地状态置为已取消。
+// 115 已成功下载的任务无法取消（文件已入库），只能删除记录。
+func (s *CloudDownloadService) Cancel(ctx context.Context, id string) error {
+	t, err := s.Get(ctx, id)
+	if err != nil {
+		return err
+	}
+	if isCloudDownloadTerminal(t.Status) {
+		return errors.New("任务已结束，无法取消")
+	}
+	if strings.TrimSpace(t.InfoHash) != "" {
+		client, cerr := s.strm.Open115Client(ctx, t.AccountID)
+		if cerr != nil {
+			s.log.Warn("cloud download cancel: open 115 client failed",
+				zap.String("task_id", t.ID), zap.Error(cerr))
+		} else if derr := client.DeleteOfflineTask(ctx, t.InfoHash, false); derr != nil {
+			// 远端删除失败不阻断本地取消：否则用户永远清不掉一条僵尸记录。
+			s.log.Warn("cloud download cancel: delete remote task failed",
+				zap.String("task_id", t.ID), zap.String("info_hash", t.InfoHash), zap.Error(derr))
+		}
+	}
+	return s.repo.CloudDownload.UpdateFields(ctx, t.ID, map[string]any{
+		"status":      model.CloudDownloadCanceled,
+		"stage":       model.CloudDownloadStageNA,
+		"stage_error": "任务已取消",
+	})
+}
+
+// Retry 重新提交失败任务：链接类重新走提交接口，BT 类用已保存的种子参数重提。
+func (s *CloudDownloadService) Retry(ctx context.Context, id string) error {
+	t, err := s.Get(ctx, id)
+	if err != nil {
+		return err
+	}
+	if t.Status != model.CloudDownloadFailed {
+		return errors.New("只有失败的任务可以重试")
+	}
+	if t.SourceType == model.CloudDownloadSourceTorrent {
+		if strings.TrimSpace(t.InfoHash) == "" || strings.TrimSpace(t.TorrentSha1) == "" || strings.TrimSpace(t.PickCode) == "" {
+			return errors.New("该种子任务的提交参数不完整，请重新上传 .torrent 文件")
+		}
+		client, err := s.strm.Open115Client(ctx, t.AccountID)
+		if err != nil {
+			return err
+		}
+		if err := client.AddTaskBT(ctx, cloud115.OfflineBTRequest{
+			InfoHash:    t.InfoHash,
+			Wanted:      "0",
+			TorrentSha1: t.TorrentSha1,
+			PickCode:    t.PickCode,
+			WpPathID:    t.WpPathID,
+		}); err != nil {
+			return err
+		}
+		return s.repo.CloudDownload.UpdateFields(ctx, t.ID, map[string]any{
+			"status":      model.CloudDownloadSubmitted,
+			"error":       "",
+			"retry_count": t.RetryCount + 1,
+		})
+	}
+	if strings.TrimSpace(t.SourceURL) == "" {
+		return errors.New("该任务缺少原始链接，无法重试")
+	}
+	// 复用提交链路：新建一条记录会让历史重复，这里直接把原记录复位再提交。
+	if err := s.repo.CloudDownload.UpdateFields(ctx, t.ID, map[string]any{
+		"status":      model.CloudDownloadQueued,
+		"error":       "",
+		"percent":     0,
+		"retry_count": t.RetryCount + 1,
+		"stage":       model.CloudDownloadStagePending,
+		"stage_error": "",
+	}); err != nil {
+		return err
+	}
+	res := s.submitLinks(ctx, t.AccountID, t.SyncPathID, t.WpPathID, []cloudDownloadParsedLink{{
+		SourceType: t.SourceType,
+		URL:        t.SourceURL,
+		Key:        t.SourceKey,
+	}}, t.ID)
+	if len(res.Items) == 1 && !res.Items[0].OK {
+		return errors.New(res.Items[0].Error)
+	}
+	return nil
+}
+
+// RetryPipeline 重做失败的后处理阶段（不重新下载）。
+func (s *CloudDownloadService) RetryPipeline(ctx context.Context, id string) error {
+	t, err := s.Get(ctx, id)
+	if err != nil {
+		return err
+	}
+	if t.Status != model.CloudDownloadSucceeded {
+		return errors.New("只有下载成功的任务可以重做后处理")
+	}
+	if t.Stage != model.CloudDownloadStageFailed && t.Stage != model.CloudDownloadStageNA {
+		return errors.New("该任务的后处理未处于失败状态")
+	}
+	if err := s.repo.CloudDownload.UpdateFields(ctx, t.ID, map[string]any{
+		"stage":       model.CloudDownloadStagePending,
+		"stage_error": "",
+	}); err != nil {
+		return err
+	}
+	helper.Go(s.log, "cloudDownload.retryPipeline", func() {
+		s.runPipelineOnce(s.baseCtx)
+	})
+	return nil
+}
+
+// Delete 删除任务记录。活跃任务必须先取消，避免留下无人追问的 115 任务。
+func (s *CloudDownloadService) Delete(ctx context.Context, id string) error {
+	t, err := s.Get(ctx, id)
+	if err != nil {
+		return err
+	}
+	if !isCloudDownloadTerminal(t.Status) {
+		return errors.New("任务进行中，请先取消再删除")
+	}
+	return s.repo.CloudDownload.Delete(ctx, id)
+}
+
+// ClearFinished 清空失败/已取消的任务。
+func (s *CloudDownloadService) ClearFinished(ctx context.Context) (int64, error) {
+	return s.repo.CloudDownload.ClearFinished(ctx)
+}
+
+// Quota 查询当前账号的云下载配额。
+func (s *CloudDownloadService) Quota(ctx context.Context, accountID string) (*cloud115.OfflineQuota, error) {
+	client, err := s.strm.Open115Client(ctx, accountID)
+	if err != nil {
+		return nil, err
+	}
+	return client.GetOfflineQuota(ctx)
+}
+
+// ─── 工具 ─────────────────────────────────────────────────────────────────────
+
+// isCloudDownloadTerminal 判断任务是否已到终态。
+func isCloudDownloadTerminal(status string) bool {
+	switch status {
+	case model.CloudDownloadSucceeded, model.CloudDownloadFailed, model.CloudDownloadCanceled:
+		return true
+	default:
+		return false
+	}
+}
+
+// offlineErrorMessage 把 115 错误码翻译成可操作的中文提示。
+func offlineErrorMessage(code int, message string) string {
+	switch code {
+	case cloud115.OfflineCodeQuotaUsedUp:
+		return "115 云下载配额已用尽，请在 115 端获取更多配额后重试"
+	case cloud115.OfflineCodeStorageFull:
+		return "115 存储空间不足"
+	case cloud115.OfflineCodeTorrentMissing:
+		return "115 找不到该种子文件（可能已被清理），请重新上传 .torrent"
+	case cloud115.OfflineCodeTooManyURLs:
+		return "单批链接超过 115 条上限"
+	case cloud115.OfflineCodeParamError:
+		return "115 拒绝了提交参数：" + message
+	case cloud115.OfflineCodeOperationFailed:
+		return "115 操作失败，请稍后重试"
+	}
+	if strings.TrimSpace(message) != "" {
+		return message
+	}
+	return fmt.Sprintf("115 返回错误码 %d", code)
+}
@@ -0,0 +1,121 @@
+// 云下载输入解析：把用户粘贴的多行文本拆成可提交的链接，并生成轮询匹配键。
+//
+// 支持的来源（与 115 /open/offline/add_task_urls 能力一致）：
+//   - 磁力：magnet:?xt=urn:btih:<hex40 或 base32>
+//   - 电驴：ed2k://|file|...
+//   - HTTP(S) / FTP 直链
+//
+// 只做「字符串层面」的识别，绝不主动请求这些 URL（无 SSRF 面）。
+package service
+
+import (
+	"net/url"
+	"strings"
+)
+
+// cloudDownloadParsedLink 是一条解析后的待提交链接。
+type cloudDownloadParsedLink struct {
+	SourceType string // model.CloudDownloadSource*
+	URL        string // 原始（trim 后）链接
+	Key        string // 去重与轮询匹配键：BT 类为大写 info_hash，其余为链接本身
+	InfoHash   string // 仅 BT 类有值
+}
+
+// cloudDownloadSkipped 是一条被跳过的原始输入。
+type cloudDownloadSkipped struct {
+	Raw    string `json:"raw"`
+	Reason string `json:"reason"`
+}
+
+// parseCloudDownloadLinks 解析多行输入。
+// 返回去重后的有效链接与被跳过的行（用于前端逐条反馈，而不是笼统报错）。
+func parseCloudDownloadLinks(raw []string) ([]cloudDownloadParsedLink, []cloudDownloadSkipped) {
+	out := make([]cloudDownloadParsedLink, 0, len(raw))
+	skipped := make([]cloudDownloadSkipped, 0)
+	seen := make(map[string]bool, len(raw))
+
+	for _, line := range raw {
+		// 允许多行文本整体粘贴：按换行再拆一次。
+		for _, part := range strings.Split(line, "\n") {
+			part = strings.TrimSpace(part)
+			if part == "" {
+				continue
+			}
+			link, reason := parseCloudDownloadLink(part)
+			if reason != "" {
+				skipped = append(skipped, cloudDownloadSkipped{Raw: part, Reason: reason})
+				continue
+			}
+			if seen[link.Key] {
+				skipped = append(skipped, cloudDownloadSkipped{Raw: part, Reason: "重复链接（本批已存在）"})
+				continue
+			}
+			seen[link.Key] = true
+			out = append(out, link)
+		}
+	}
+	return out, skipped
+}
+
+// parseCloudDownloadLink 识别单条链接；reason 非空表示不支持。
+func parseCloudDownloadLink(raw string) (cloudDownloadParsedLink, string) {
+	lower := strings.ToLower(raw)
+	switch {
+	case strings.HasPrefix(lower, "magnet:"):
+		hash := magnetInfoHash(raw)
+		if hash == "" {
+			return cloudDownloadParsedLink{}, "磁力链接缺少有效的 btih 哈希"
+		}
+		return cloudDownloadParsedLink{
+			SourceType: "magnet",
+			URL:        raw,
+			Key:        hash,
+			InfoHash:   hash,
+		}, ""
+	case strings.HasPrefix(lower, "ed2k://"):
+		return cloudDownloadParsedLink{
+			SourceType: "ed2k",
+			URL:        raw,
+			Key:        raw,
+		}, ""
+	case strings.HasPrefix(lower, "http://"), strings.HasPrefix(lower, "https://"):
+		return cloudDownloadParsedLink{
+			SourceType: "http",
+			URL:        raw,
+			Key:        raw,
+		}, ""
+	case strings.HasPrefix(lower, "ftp://"):
+		return cloudDownloadParsedLink{
+			SourceType: "ftp",
+			URL:        raw,
+			Key:        raw,
+		}, ""
+	default:
+		return cloudDownloadParsedLink{}, "不支持的链接类型（仅支持磁力 / ed2k / http(s) / ftp）"
+	}
+}
+
+// magnetInfoHash 从磁力链接中提取大写化的 btih 哈希。
+// 兼容 hex（40 字符）与 base32（32 字符）两种写法；无法识别时返回空串。
+func magnetInfoHash(link string) string {
+	u, err := url.Parse(strings.TrimSpace(link))
+	if err != nil {
+		return ""
+	}
+	for _, xt := range u.Query()["xt"] {
+		const prefix = "urn:btih:"
+		if len(xt) <= len(prefix) || !strings.EqualFold(xt[:len(prefix)], prefix) {
+			continue
+		}
+		hash := strings.TrimSpace(xt[len(prefix):])
+		// 去掉可能存在的 &dn= 之类残留（少数客户端拼接不规范）。
+		if idx := strings.IndexAny(hash, "&?#"); idx >= 0 {
+			hash = hash[:idx]
+		}
+		if len(hash) != 40 && len(hash) != 32 {
+			continue
+		}
+		return strings.ToUpper(hash)
+	}
+	return ""
+}
@@ -0,0 +1,285 @@
+// 云下载后处理管线：下载成功 → STRM 增量同步 → 媒体库扫描 → 自动刮削。
+//
+// 与 STRM 同步的耦合方式：
+//   - 这里只负责「发起同步」，不知道同步内部怎么走；
+//   - StrmService.finishSync 通过 SetSyncFinishHook 回调 onStrmSyncFinished，
+//     由后者把 syncing 状态推进到 scanning/done。
+//
+// 去抖：bench 上常见一场「一次提交 20 条链接」，如果每条完成都触发一次全树
+// 同步（walk115Flat 是整树自适应拉取），115 限流与本地 IO 都会被打满。
+// 因此同一同步目录在 debounce 窗口内只发起一次同步，其余任务停在 waiting_sync。
+package service
+
+import (
+	"context"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/model"
+)
+
+// runPipelineOnce 推进所有待处理任务。由 Start 里的 ticker 周期调用，也可手动触发。
+func (s *CloudDownloadService) runPipelineOnce(ctx context.Context) {
+	if s.repo == nil || s.repo.CloudDownload == nil {
+		return
+	}
+	candidates, err := s.repo.CloudDownload.ListPipelineCandidates(ctx)
+	if err != nil {
+		s.log.Warn("cloud download pipeline: list candidates failed", zap.Error(err))
+		return
+	}
+	if len(candidates) == 0 {
+		return
+	}
+	groups := map[string][]model.CloudDownloadTask{}
+	for _, t := range candidates {
+		groups[t.SyncPathID] = append(groups[t.SyncPathID], t)
+	}
+	for syncPathID, tasks := range groups {
+		s.advanceSyncPath(ctx, syncPathID, tasks)
+	}
+}
+
+// advanceSyncPath 推进一个同步目录下的待处理任务。
+func (s *CloudDownloadService) advanceSyncPath(ctx context.Context, syncPathID string, tasks []model.CloudDownloadTask) {
+	path, err := s.repo.StrmSyncPath.FindByID(ctx, syncPathID)
+	if err != nil {
+		s.log.Warn("cloud download pipeline: load sync path failed",
+			zap.String("path_id", syncPathID), zap.Error(err))
+		return
+	}
+	if path == nil || !path.Enabled || path.Provider != model.StrmProvider115 {
+		s.failStage(ctx, tasks, "同步目录不存在、已禁用或不是 115 网盘目录", model.CloudDownloadStageNA)
+		return
+	}
+
+	// 同步进行中：本轮只标记等待，避免把 StartSync 的「正在同步中」错误打成失败。
+	if s.strm != nil && s.strm.IsSyncRunning(syncPathID) {
+		s.markWaiting(ctx, tasks)
+		return
+	}
+
+	// 去抖窗口内不重复发起同步。
+	if !s.debounceElapsed(syncPathID) {
+		s.markWaiting(ctx, tasks)
+		return
+	}
+
+	if s.strm == nil {
+		s.failStage(ctx, tasks, "STRM 同步服务不可用", model.CloudDownloadStageFailed)
+		return
+	}
+	if err := s.strm.StartSync(ctx, syncPathID); err != nil {
+		// 最常见的竞态：刚判断完不忙，另一个人（或 cron）抢先启动。
+		if strings.Contains(err.Error(), "正在同步中") {
+			s.markWaiting(ctx, tasks)
+			return
+		}
+		s.failStage(ctx, tasks, "触发 STRM 同步失败："+err.Error(), model.CloudDownloadStageFailed)
+		return
+	}
+	s.noteTrigger(syncPathID)
+	for _, t := range tasks {
+		_ = s.repo.CloudDownload.UpdateFields(ctx, t.ID, map[string]any{
+			"stage":       model.CloudDownloadStageSyncing,
+			"stage_error": "",
+		})
+	}
+}
+
+// onStrmSyncFinished 是 StrmService 的同步完成回调。
+// 只处理「因云下载而发起且当前处于 syncing」的任务：手动/Cron 同步也会触发
+// 这个回调，没有云下载任务时直接返回。
+func (s *CloudDownloadService) onStrmSyncFinished(ctx context.Context, syncPathID, status string) {
+	if s.repo == nil || s.repo.CloudDownload == nil {
+		return
+	}
+	tasks, err := s.repo.CloudDownload.ListBySyncPathAndStage(ctx, syncPathID, model.CloudDownloadStageSyncing)
+	if err != nil {
+		s.log.Warn("cloud download pipeline: list syncing tasks failed",
+			zap.String("path_id", syncPathID), zap.Error(err))
+		return
+	}
+	if len(tasks) == 0 {
+		return
+	}
+	if status != model.StrmSyncRecordDone {
+		for _, t := range tasks {
+			_ = s.repo.CloudDownload.UpdateFields(ctx, t.ID, map[string]any{
+				"stage":       model.CloudDownloadStageFailed,
+				"stage_error": "STRM 同步" + strmStatusLabel(status),
+			})
+		}
+		// 同步失败也要记一次触发时间，给用户一个冷静期，避免立即重试形成惊吓式循环。
+		s.noteTrigger(syncPathID)
+		return
+	}
+
+	path, err := s.repo.StrmSyncPath.FindByID(ctx, syncPathID)
+	if err != nil || path == nil {
+		s.failStage(ctx, tasks, "同步目录已被删除", model.CloudDownloadStageNA)
+		return
+	}
+	root := s.matchLibraryRoot(ctx, path.LocalPath)
+	if root == nil {
+		s.failStage(ctx, tasks, "STRM 输出目录未加入任何媒体库（本地目录："+path.LocalPath+"）", model.CloudDownloadStageNA)
+		return
+	}
+
+	for _, t := range tasks {
+		_ = s.repo.CloudDownload.UpdateFields(ctx, t.ID, map[string]any{
+			"stage":      model.CloudDownloadStageScanning,
+			"library_id": root.LibraryID,
+		})
+	}
+
+	scanAdded, scanErr := s.scanLibrary(ctx, root.LibraryID)
+	if scanErr != nil {
+		s.failStage(ctx, tasks, "扫描媒体库失败："+scanErr.Error(), model.CloudDownloadStageFailed)
+		return
+	}
+
+	scrapeQueued := 0
+	if s.autoScrape() && s.scraper != nil && s.scraper.AnyEnabled() {
+		// EnqueueLibrary 默认只挑 scrape_status 为空的 pending 行，
+		// 因此全库入队不会重刷已刮好的条目。
+		if n, err := s.scraper.EnqueueLibrary(ctx, root.LibraryID, ScrapeOptions{}); err != nil {
+			s.log.Warn("cloud download pipeline: enqueue scrape failed",
+				zap.String("library_id", root.LibraryID), zap.Error(err))
+		} else {
+			scrapeQueued = n
+		}
+	}
+
+	stageError := ""
+	if s.autoScrape() && (s.scraper == nil || !s.scraper.AnyEnabled()) {
+		stageError = "未配置任何刮削源，已跳过自动刮削"
+	}
+
+	for _, t := range tasks {
+		_ = s.repo.CloudDownload.UpdateFields(ctx, t.ID, map[string]any{
+			"stage":         model.CloudDownloadStageDone,
+			"stage_error":   stageError,
+			"library_id":    root.LibraryID,
+			"scan_added":    scanAdded,
+			"scrape_queued": scrapeQueued,
+		})
+	}
+	s.log.Info("cloud download pipeline finished",
+		zap.String("path_id", syncPathID),
+		zap.String("library_id", root.LibraryID),
+		zap.Int("tasks", len(tasks)),
+		zap.Int("scan_added", scanAdded),
+		zap.Int("scrape_queued", scrapeQueued))
+}
+
+// markWaiting 把任务置为等待同步。
+func (s *CloudDownloadService) markWaiting(ctx context.Context, tasks []model.CloudDownloadTask) {
+	for _, t := range tasks {
+		if t.Stage == model.CloudDownloadStageWaitingSync {
+			continue
+		}
+		_ = s.repo.CloudDownload.UpdateFields(ctx, t.ID, map[string]any{
+			"stage":       model.CloudDownloadStageWaitingSync,
+			"stage_error": "",
+		})
+	}
+}
+
+// failStage 把任务置为阶段失败/跳过。
+func (s *CloudDownloadService) failStage(ctx context.Context, tasks []model.CloudDownloadTask, msg, stage string) {
+	for _, t := range tasks {
+		_ = s.repo.CloudDownload.UpdateFields(ctx, t.ID, map[string]any{
+			"stage":       stage,
+			"stage_error": msg,
+		})
+	}
+}
+
+// matchLibraryRoot 按 STRM 本地输出目录反查媒体库根路径。
+// 命中条件：路径相同，或 localPath 位于 root.Path 之下（同一块盘的子目录也算）。
+func (s *CloudDownloadService) matchLibraryRoot(ctx context.Context, localPath string) *model.LibraryRoot {
+	localPath = strings.TrimSpace(localPath)
+	if localPath == "" || s.repo.Library == nil {
+		return nil
+	}
+	roots, err := s.repo.Library.ListEnabledRoots(ctx)
+	if err != nil {
+		s.log.Warn("cloud download pipeline: list library roots failed", zap.Error(err))
+		return nil
+	}
+	local := filepath.Clean(localPath)
+	for i := range roots {
+		root := roots[i]
+		candidate := filepath.Clean(strings.TrimSpace(root.Path))
+		if candidate == "" {
+			continue
+		}
+		if sameLibraryPath(candidate, local) {
+			return &root
+		}
+		// 子目录判断也走同一套路径归一化（Windows 盘符映射/容器前缀）。
+		withSep := candidate
+		if !strings.HasSuffix(withSep, string(filepath.Separator)) {
+			withSep += string(filepath.Separator)
+		}
+		if strings.HasPrefix(local, withSep) || strings.HasPrefix(cleanPathForVolumeMapping(local), cleanPathForVolumeMapping(withSep)) {
+			return &root
+		}
+	}
+	return nil
+}
+
+// scanLibrary 扫描媒体库并返回新增条目数。
+func (s *CloudDownloadService) scanLibrary(ctx context.Context, libraryID string) (int, error) {
+	if s.scanner == nil {
+		return 0, nil
+	}
+	res, err := s.scanner.ScanLibrary(ctx, libraryID)
+	if err != nil {
+		return 0, err
+	}
+	if res == nil {
+		return 0, nil
+	}
+	return res.Added, nil
+}
+
+// debounceElapsed 判断距上次触发是否已过去一个去抖窗口。
+func (s *CloudDownloadService) debounceElapsed(syncPathID string) bool {
+	window := s.debounceWindow()
+	if window <= 0 {
+		return true
+	}
+	s.debounceMu.Lock()
+	defer s.debounceMu.Unlock()
+	last, ok := s.lastTrigger[syncPathID]
+	if !ok {
+		return true
+	}
+	return time.Since(last) >= window
+}
+
+// noteTrigger 记录本次触发时间。
+func (s *CloudDownloadService) noteTrigger(syncPathID string) {
+	s.debounceMu.Lock()
+	s.lastTrigger[syncPathID] = time.Now()
+	s.debounceMu.Unlock()
+}
+
+// strmStatusLabel 把同步记录状态翻译成中文。
+func strmStatusLabel(status string) string {
+	switch status {
+	case model.StrmSyncRecordFailed:
+		return "失败"
+	case model.StrmSyncRecordCanceled:
+		return "被取消"
+	case model.StrmSyncRecordDone:
+		return "完成"
+	default:
+		return status
+	}
+}
@@ -0,0 +1,149 @@
+// 云下载轮询：把 115 任务列表的状态映射回本地任务表。
+//
+// 设计约束：
+//   - 没有活跃任务时不发起任何 115 请求（避免无意义配额与限流风险）；
+//   - 按账号分组，一个账号一轮只翻页一次，供该账号下所有任务复用；
+//   - 只做状态映射，不触发后处理（后处理由 pipeline 负责，两者解耦）。
+package service
+
+import (
+	"context"
+	"strings"
+	"time"
+
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/service/cloud115"
+)
+
+// PollOnce 执行一轮 115 任务状态同步。导出以便测试与手动触发。
+func (s *CloudDownloadService) PollOnce(ctx context.Context) error {
+	active, err := s.repo.CloudDownload.ListByStatuses(ctx, []string{
+		model.CloudDownloadSubmitted,
+		model.CloudDownloadDownloading,
+	})
+	if err != nil {
+		return err
+	}
+	if len(active) == 0 {
+		return nil
+	}
+
+	// 按账号分组：同一账号只拉一次任务列表。
+	byAccount := map[string][]model.CloudDownloadTask{}
+	for _, t := range active {
+		byAccount[t.AccountID] = append(byAccount[t.AccountID], t)
+	}
+
+	for accountID, tasks := range byAccount {
+		s.pollAccount(ctx, accountID, tasks)
+	}
+	return nil
+}
+
+// pollAccount 拉取单个账号的任务列表并回写本地任务状态。
+func (s *CloudDownloadService) pollAccount(ctx context.Context, accountID string, tasks []model.CloudDownloadTask) {
+	client, err := s.strm.Open115Client(ctx, accountID)
+	if err != nil {
+		// 账号被禁用/删除时不改任务状态：等用户处理账号，任务保留可重试。
+		s.log.Warn("cloud download poll: open 115 client failed",
+			zap.String("account_id", accountID), zap.Error(err))
+		return
+	}
+
+	byHash := map[string]cloud115.OfflineTask{}
+	byURL := map[string]cloud115.OfflineTask{}
+	pages := s.maxPollPages()
+	for page := 1; page <= pages; page++ {
+		list, err := client.GetOfflineTaskList(ctx, page)
+		if err != nil {
+			s.log.Warn("cloud download poll: list tasks failed",
+				zap.String("account_id", accountID), zap.Int("page", page), zap.Error(err))
+			break
+		}
+		if list == nil {
+			break
+		}
+		for _, t := range list.Tasks {
+			if h := strings.ToUpper(strings.TrimSpace(t.InfoHash)); h != "" {
+				byHash[h] = t
+			}
+			if u := strings.TrimSpace(t.URL); u != "" {
+				byURL[u] = t
+			}
+		}
+		if list.PageCount <= page || len(list.Tasks) == 0 {
+			break
+		}
+	}
+
+	now := time.Now()
+	timeout := s.taskTimeout()
+	for _, t := range tasks {
+		offline := matchOfflineTask(t, byHash, byURL)
+		fields := map[string]any{"last_poll_at": now}
+
+		if offline == nil {
+			// 115 侧暂未出现（受理有延迟）或已不在列表（被清理）。
+			// 只在超时后才判失败，避免把「刚提交」误判成失败。
+			if !t.CreatedAt.IsZero() && now.Sub(t.CreatedAt) > timeout {
+				fields["status"] = model.CloudDownloadFailed
+				fields["error"] = "下载超时：115 侧长时间未完成（任务可能已被清理）"
+			}
+			s.applyPollFields(ctx, t.ID, fields)
+			continue
+		}
+
+		switch offline.Status {
+		case cloud115.OfflineTaskStatusDone:
+			fields["status"] = model.CloudDownloadSucceeded
+			fields["percent"] = 100
+			if offline.Size > 0 {
+				fields["size_bytes"] = offline.Size
+			}
+			if t.CompletedAt == nil {
+				fields["completed_at"] = now
+			}
+			fields["error"] = ""
+		case cloud115.OfflineTaskStatusFailed:
+			fields["status"] = model.CloudDownloadFailed
+			fields["error"] = "115 云下载失败（可能资源失效或无人做种）"
+		default: // 0 分配中 / 1 下载中
+			fields["status"] = model.CloudDownloadDownloading
+			fields["percent"] = offline.PercentDone
+			if offline.Size > 0 {
+				fields["size_bytes"] = offline.Size
+			}
+		}
+		s.applyPollFields(ctx, t.ID, fields)
+	}
+}
+
+// applyPollFields 只写轮询关心的列，绝不能整行 Update：
+// 后处理线程可能在并发写 stage/scan_added 等字段。
+func (s *CloudDownloadService) applyPollFields(ctx context.Context, taskID string, fields map[string]any) {
+	if err := s.repo.CloudDownload.UpdateFields(ctx, taskID, fields); err != nil {
+		s.log.Warn("cloud download poll: update task failed",
+			zap.String("task_id", taskID), zap.Error(err))
+	}
+}
+
+// matchOfflineTask 匹配 115 任务：info_hash 优先，其次原始链接。
+func matchOfflineTask(t model.CloudDownloadTask, byHash, byURL map[string]cloud115.OfflineTask) *cloud115.OfflineTask {
+	if h := strings.ToUpper(strings.TrimSpace(t.InfoHash)); h != "" {
+		if item, ok := byHash[h]; ok {
+			return &item
+		}
+	}
+	for _, key := range []string{t.SourceKey, t.SourceURL} {
+		key = strings.TrimSpace(key)
+		if key == "" {
+			continue
+		}
+		if item, ok := byURL[key]; ok {
+			return &item
+		}
+	}
+	return nil
+}
@@ -0,0 +1,439 @@
+// 云下载提交：校验目标、配额预检、批量提交链接、.torrent 上传解析后提交。
+package service
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/service/cloud115"
+)
+
+// cloudDownloadSeedDirName 是 115 上用于暂存 .torrent 的目录（两级）。
+// 官方文档建议把种子放进「云下载/种子文件」，但不是硬性要求；不存在时自动创建。
+var cloudDownloadSeedDirPath = []string{"云下载", "种子文件"}
+
+// CloudDownloadSubmit 是链接提交请求。
+// AccountID 允许为空：始终以同步目录绑定的账号为准，避免前端传错账号导致
+// 「任务挂在 A 账号、文件落到 B 目录」这种无法自动恢复的错配。
+type CloudDownloadSubmit struct {
+	AccountID  string   `json:"account_id"`
+	SyncPathID string   `json:"sync_path_id"`
+	URLs       []string `json:"urls"`
+}
+
+// CloudDownloadTorrentRequest 是 .torrent 提交请求（文件内容由 handler 读入）。
+type CloudDownloadTorrentRequest struct {
+	AccountID  string
+	SyncPathID string
+	FileName   string
+	Data       []byte
+}
+
+// CloudDownloadTaskResult 是单条来源的提交结果。
+type CloudDownloadTaskResult struct {
+	TaskID string `json:"task_id,omitempty"`
+	Source string `json:"source"`
+	OK     bool   `json:"ok"`
+	Error  string `json:"error,omitempty"`
+}
+
+// CloudDownloadSubmitResult 是批量提交结果：部分成功也返回 200 + 明细。
+type CloudDownloadSubmitResult struct {
+	Accepted int                       `json:"accepted"`
+	Rejected int                       `json:"rejected"`
+	Items    []CloudDownloadTaskResult `json:"items"`
+	Skipped  []cloudDownloadSkipped    `json:"skipped,omitempty"`
+}
+
+// Submit 提交一批链接任务。
+func (s *CloudDownloadService) Submit(ctx context.Context, req CloudDownloadSubmit) (*CloudDownloadSubmitResult, error) {
+	p, err := s.resolveTarget(ctx, req.SyncPathID)
+	if err != nil {
+		return nil, err
+	}
+	links, skipped := parseCloudDownloadLinks(req.URLs)
+	res := &CloudDownloadSubmitResult{Skipped: skipped}
+	if len(links) == 0 {
+		for _, sk := range skipped {
+			res.Items = append(res.Items, CloudDownloadTaskResult{Source: sk.Raw, Error: sk.Reason})
+			res.Rejected++
+		}
+		return res, nil
+	}
+	if err := s.ensureQuota(ctx, p.AccountID); err != nil {
+		return nil, err
+	}
+	submitRes := s.submitLinks(ctx, p.AccountID, p.ID, p.RemotePath, links, "")
+	submitRes.Skipped = skipped
+	return submitRes, nil
+}
+
+// SubmitTorrent 上传 .torrent 到 115、解析后提交为 BT 任务。
+//
+// 本期不做「选择部分文件」：115 开放平台的磁力链路没有文件选择能力，
+// .torrent 链路虽然支持 wanted，但产品上暂不提供勾选 UI（见 docs/cloud-download-plan.md）。
+// 因此 wanted 传 "0"（官方文档唯一明确允许的取值），语义待真机验证。
+func (s *CloudDownloadService) SubmitTorrent(ctx context.Context, req CloudDownloadTorrentRequest) (*CloudDownloadSubmitResult, error) {
+	p, err := s.resolveTarget(ctx, req.SyncPathID)
+	if err != nil {
+		return nil, err
+	}
+	if len(req.Data) == 0 {
+		return nil, errors.New("种子文件为空")
+	}
+	if int64(len(req.Data)) > s.torrentMaxBytes() {
+		return nil, fmt.Errorf("种子文件超过大小上限（%d MB）", s.torrentMaxBytes()>>20)
+	}
+	if err := s.ensureQuota(ctx, p.AccountID); err != nil {
+		return nil, err
+	}
+	client, err := s.strm.Open115Client(ctx, p.AccountID)
+	if err != nil {
+		return nil, err
+	}
+
+	// 1. 写入临时文件：115 上传接口只接受本地路径。
+	tmp, err := os.CreateTemp("", cloudDownloadTorrentTempPrefix+"*.torrent")
+	if err != nil {
+		return nil, fmt.Errorf("创建种子临时文件失败：%w", err)
+	}
+	tmpPath := tmp.Name()
+	defer func() { _ = os.Remove(tmpPath) }()
+	if _, err := tmp.Write(req.Data); err != nil {
+		_ = tmp.Close()
+		return nil, fmt.Errorf("写入种子临时文件失败：%w", err)
+	}
+	if err := tmp.Close(); err != nil {
+		return nil, fmt.Errorf("关闭种子临时文件失败：%w", err)
+	}
+
+	// 2. 上传到「云下载/种子文件」；建目录失败时回落到同步目录，避免整条链路失败。
+	parentCID, derr := s.ensureSeedDir(ctx, client)
+	if derr != nil {
+		s.log.Warn("cloud download: ensure seed dir failed, fallback to sync path",
+			zap.String("path_id", p.ID), zap.Error(derr))
+		parentCID = p.RemotePath
+	}
+	uploaded, err := client.Upload(ctx, tmpPath, parentCID, "", "")
+	if err != nil {
+		return nil, fmt.Errorf("上传种子到 115 失败：%w", err)
+	}
+	if strings.TrimSpace(uploaded.Sha1) == "" || strings.TrimSpace(uploaded.PickCode) == "" {
+		return nil, errors.New("115 上传种子未返回 sha1/pick_code")
+	}
+
+	// 3. 解析种子（拿 info_hash 与任务名）。
+	info, err := client.ParseTorrent(ctx, uploaded.Sha1, uploaded.PickCode)
+	if err != nil {
+		return nil, fmt.Errorf("解析 BT 种子失败：%w", err)
+	}
+	infoHash := strings.ToUpper(strings.TrimSpace(info.InfoHash))
+	if infoHash == "" {
+		return nil, errors.New("115 解析种子未返回 info_hash")
+	}
+
+	// 4. 提交 BT 任务。
+	if err := client.AddTaskBT(ctx, cloud115.OfflineBTRequest{
+		InfoHash:    infoHash,
+		Wanted:      "0",
+		TorrentSha1: uploaded.Sha1,
+		PickCode:    uploaded.PickCode,
+		WpPathID:    p.RemotePath,
+	}); err != nil {
+		return nil, fmt.Errorf("提交 BT 任务失败：%w", err)
+	}
+
+	// 5. 落库。
+	task := &model.CloudDownloadTask{
+		AccountID:   p.AccountID,
+		SyncPathID:  p.ID,
+		Provider:    model.StrmProvider115,
+		SourceType:  model.CloudDownloadSourceTorrent,
+		SourceURL:   req.FileName,
+		SourceKey:   infoHash,
+		InfoHash:    infoHash,
+		TorrentName: info.Name,
+		TorrentSha1: uploaded.Sha1,
+		PickCode:    uploaded.PickCode,
+		WpPathID:    p.RemotePath,
+		Status:      model.CloudDownloadSubmitted,
+		SizeBytes:   info.FileSize,
+		Stage:       model.CloudDownloadStagePending,
+	}
+	if err := s.repo.CloudDownload.Create(ctx, task); err != nil {
+		return nil, err
+	}
+	return &CloudDownloadSubmitResult{
+		Accepted: 1,
+		Items: []CloudDownloadTaskResult{{
+			TaskID: task.ID,
+			Source: req.FileName,
+			OK:     true,
+		}},
+	}, nil
+}
+
+// resolveTarget 校验同步目录并返回它。云下载只支持 115 同步目录，
+// 且远端必须是有效目录 ID（0 表示网盘根目录，落到根目录的离线文件永远扫不到）。
+func (s *CloudDownloadService) resolveTarget(ctx context.Context, syncPathID string) (*model.StrmSyncPath, error) {
+	syncPathID = strings.TrimSpace(syncPathID)
+	if syncPathID == "" {
+		return nil, errors.New("请选择目标 STRM 同步目录")
+	}
+	p, err := s.repo.StrmSyncPath.FindByID(ctx, syncPathID)
+	if err != nil {
+		return nil, err
+	}
+	if p == nil {
+		return nil, errors.New("STRM 同步目录不存在")
+	}
+	if !p.Enabled {
+		return nil, errors.New("STRM 同步目录已禁用")
+	}
+	if p.Provider != model.StrmProvider115 {
+		return nil, errors.New("只有 115 网盘同步目录支持云下载")
+	}
+	if strings.TrimSpace(p.AccountID) == "" {
+		return nil, errors.New("该同步目录未关联 115 账号")
+	}
+	wp := strings.TrimSpace(p.RemotePath)
+	if wp == "" || wp == "0" {
+		return nil, errors.New("同步目录的远端目录无效（不能是网盘根目录）")
+	}
+	return p, nil
+}
+
+// ensureQuota 提交前的配额闸门。配额接口失败不阻断提交：
+// 部分应用可能未开放该接口权限，真正的失败由 add_task_* 的错误码兜底。
+func (s *CloudDownloadService) ensureQuota(ctx context.Context, accountID string) error {
+	client, err := s.strm.Open115Client(ctx, accountID)
+	if err != nil {
+		return err
+	}
+	quota, err := client.GetOfflineQuota(ctx)
+	if err != nil {
+		s.log.Warn("cloud download: quota probe failed, continue submit",
+			zap.String("account_id", accountID), zap.Error(err))
+		return nil
+	}
+	if quota != nil && quota.Surplus <= 0 {
+		return errors.New("115 云下载配额已用尽，请在 115 端获取更多配额后重试")
+	}
+	return nil
+}
+
+// submitLinks 分批提交链接，并逐条落库。
+// existingTaskID 非空时表示「重试单条历史任务」，此时更新原记录而不是新建。
+func (s *CloudDownloadService) submitLinks(
+	ctx context.Context,
+	accountID, syncPathID, wpPathID string,
+	links []cloudDownloadParsedLink,
+	existingTaskID string,
+) *CloudDownloadSubmitResult {
+	res := &CloudDownloadSubmitResult{}
+	active := map[string]bool{}
+
+	if existingTaskID == "" {
+		keys := make([]string, 0, len(links))
+		for _, l := range links {
+			keys = append(keys, l.Key)
+		}
+		if dedup, err := s.repo.CloudDownload.FindActiveBySourceKeys(ctx, keys); err == nil {
+			active = dedup
+		}
+		filtered := make([]cloudDownloadParsedLink, 0, len(links))
+		for _, l := range links {
+			if active[l.Key] {
+				res.Items = append(res.Items, CloudDownloadTaskResult{
+					Source: l.URL,
+					Error:  "该链接已有进行中的任务",
+				})
+				res.Rejected++
+				continue
+			}
+			filtered = append(filtered, l)
+		}
+		links = filtered
+	}
+
+	if len(links) == 0 {
+		return res
+	}
+
+	client, err := s.strm.Open115Client(ctx, accountID)
+	if err != nil {
+		for _, l := range links {
+			res.Items = append(res.Items, CloudDownloadTaskResult{Source: l.URL, Error: err.Error()})
+			res.Rejected++
+			s.persistSubmitFailure(ctx, accountID, syncPathID, wpPathID, l, err.Error(), existingTaskID)
+		}
+		return res
+	}
+
+	for start := 0; start < len(links); start += cloud115.OfflineMaxURLsPerBatch {
+		end := start + cloud115.OfflineMaxURLsPerBatch
+		if end > len(links) {
+			end = len(links)
+		}
+		batch := links[start:end]
+		urls := make([]string, 0, len(batch))
+		for _, l := range batch {
+			urls = append(urls, l.URL)
+		}
+		results, reqErr := client.AddTaskURLs(ctx, urls, wpPathID)
+		if reqErr != nil {
+			msg := reqErr.Error()
+			for _, l := range batch {
+				res.Items = append(res.Items, CloudDownloadTaskResult{Source: l.URL, Error: msg})
+				res.Rejected++
+				s.persistSubmitFailure(ctx, accountID, syncPathID, wpPathID, l, msg, existingTaskID)
+			}
+			continue
+		}
+		// 115 不保证结果顺序与入参一致：先按 url 建索引，缺失项再按顺序兜底。
+		byURL := make(map[string]cloud115.OfflineTaskURLResult, len(results))
+		for _, r := range results {
+			if u := strings.TrimSpace(r.URL); u != "" {
+				byURL[u] = r
+			}
+		}
+		for i, l := range batch {
+			r, ok := byURL[l.URL]
+			if !ok && i < len(results) {
+				r = results[i]
+			}
+			if !r.State {
+				msg := offlineErrorMessage(r.Code, r.Message)
+				res.Items = append(res.Items, CloudDownloadTaskResult{Source: l.URL, Error: msg})
+				res.Rejected++
+				s.persistSubmitFailure(ctx, accountID, syncPathID, wpPathID, l, msg, existingTaskID)
+				continue
+			}
+			infoHash := strings.ToUpper(strings.TrimSpace(r.InfoHash))
+			if infoHash == "" {
+				infoHash = l.InfoHash
+			}
+			key := l.Key
+			if infoHash != "" {
+				key = infoHash
+			}
+			taskID, perr := s.persistSubmitSuccess(ctx, accountID, syncPathID, wpPathID, l, key, infoHash, existingTaskID)
+			if perr != nil {
+				res.Items = append(res.Items, CloudDownloadTaskResult{Source: l.URL, Error: "115 已受理，但本地记录失败：" + perr.Error()})
+				res.Rejected++
+				continue
+			}
+			res.Items = append(res.Items, CloudDownloadTaskResult{TaskID: taskID, Source: l.URL, OK: true})
+			res.Accepted++
+		}
+	}
+	return res
+}
+
+// persistSubmitSuccess 写入一条已受理的任务，返回任务 ID。
+func (s *CloudDownloadService) persistSubmitSuccess(
+	ctx context.Context, accountID, syncPathID, wpPathID string,
+	link cloudDownloadParsedLink, key, infoHash, existingTaskID string,
+) (string, error) {
+	if existingTaskID != "" {
+		return existingTaskID, s.repo.CloudDownload.UpdateFields(ctx, existingTaskID, map[string]any{
+			"status":       model.CloudDownloadSubmitted,
+			"error":        "",
+			"percent":      0,
+			"info_hash":    infoHash,
+			"source_key":   key,
+			"last_poll_at": nil,
+			"stage":        model.CloudDownloadStagePending,
+			"stage_error":  "",
+		})
+	}
+	task := &model.CloudDownloadTask{
+		AccountID:  accountID,
+		SyncPathID: syncPathID,
+		Provider:   model.StrmProvider115,
+		SourceType: link.SourceType,
+		SourceURL:  link.URL,
+		SourceKey:  key,
+		InfoHash:   infoHash,
+		WpPathID:   wpPathID,
+		Status:     model.CloudDownloadSubmitted,
+		Stage:      model.CloudDownloadStagePending,
+	}
+	if err := s.repo.CloudDownload.Create(ctx, task); err != nil {
+		return "", err
+	}
+	return task.ID, nil
+}
+
+// persistSubmitFailure 记录一条提交失败的任务，供用户在列表里看到原因并重试。
+func (s *CloudDownloadService) persistSubmitFailure(
+	ctx context.Context, accountID, syncPathID, wpPathID string,
+	link cloudDownloadParsedLink, msg, existingTaskID string,
+) {
+	if existingTaskID != "" {
+		_ = s.repo.CloudDownload.UpdateFields(ctx, existingTaskID, map[string]any{
+			"status": model.CloudDownloadFailed,
+			"error":  msg,
+		})
+		return
+	}
+	task := &model.CloudDownloadTask{
+		AccountID:  accountID,
+		SyncPathID: syncPathID,
+		Provider:   model.StrmProvider115,
+		SourceType: link.SourceType,
+		SourceURL:  link.URL,
+		SourceKey:  link.Key,
+		InfoHash:   link.InfoHash,
+		WpPathID:   wpPathID,
+		Status:     model.CloudDownloadFailed,
+		Error:      msg,
+		Stage:      model.CloudDownloadStagePending,
+	}
+	if err := s.repo.CloudDownload.Create(ctx, task); err != nil {
+		s.log.Warn("cloud download: persist failed task failed", zap.Error(err))
+	}
+}
+
+// ensureSeedDir 返回 115 上「云下载/种子文件」目录的 cid，不存在则创建。
+func (s *CloudDownloadService) ensureSeedDir(ctx context.Context, client *cloud115.OpenClient) (string, error) {
+	parent := "0"
+	for _, name := range cloudDownloadSeedDirPath {
+		cid, err := s.findOrCreateDir(ctx, client, parent, name)
+		if err != nil {
+			return "", err
+		}
+		parent = cid
+	}
+	return parent, nil
+}
+
+// findOrCreateDir 在 parentCID 下按名称查找子目录，未命中则创建。
+// 先查后建的原因：115 的 folder/add 对已存在同名目录的行为文档未定义，
+// 直接创建可能得到重复目录或错误。
+func (s *CloudDownloadService) findOrCreateDir(ctx context.Context, client *cloud115.OpenClient, parentCID, name string) (string, error) {
+	const pageSize = 1150
+	offset := 0
+	for {
+		files, _, err := client.GetFsList(ctx, parentCID, offset, pageSize)
+		if err != nil {
+			return "", err
+		}
+		for _, f := range files {
+			if f.Category == cloud115.TypeDir && strings.EqualFold(strings.TrimSpace(f.FileName), name) {
+				return f.FileId, nil
+			}
+		}
+		if len(files) < pageSize {
+			break
+		}
+		offset += len(files)
+	}
+	return client.MkDir(ctx, parentCID, name)
+}
@@ -0,0 +1,220 @@
+package service
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+)
+
+func TestParseCloudDownloadLinks(t *testing.T) {
+	links, skipped := parseCloudDownloadLinks([]string{
+		"  magnet:?xt=urn:btih:0123456789abcdef0123456789abcdef01234567&dn=x  ",
+		"ed2k://|file|a.mkv|100|0123456789ABCDEF0123456789ABCDEF|/",
+		"https://example.com/a.mkv",
+		"ftp://example.com/b.mkv",
+		"magnet:?xt=urn:btih:0123456789abcdef0123456789abcdef01234567", // 与第一条重复
+		"not-a-link",
+		"",
+		"magnet:?xt=urn:btih:tooshort", // 非法哈希
+	})
+	if len(links) != 4 {
+		t.Fatalf("links = %d, want 4: %+v", len(links), links)
+	}
+	if links[0].SourceType != model.CloudDownloadSourceMagnet {
+		t.Errorf("first source type = %q", links[0].SourceType)
+	}
+	if links[0].Key != "0123456789ABCDEF0123456789ABCDEF01234567" {
+		t.Errorf("magnet key = %q, want uppercase info hash", links[0].Key)
+	}
+	if links[1].SourceType != model.CloudDownloadSourceED2K {
+		t.Errorf("second source type = %q", links[1].SourceType)
+	}
+	if links[2].SourceType != model.CloudDownloadSourceHTTP {
+		t.Errorf("third source type = %q", links[2].SourceType)
+	}
+	if links[3].SourceType != model.CloudDownloadSourceFTP {
+		t.Errorf("fourth source type = %q", links[3].SourceType)
+	}
+	// 空行不算错误，只有重复链接/不支持的类型/非法哈希会被记为跳过。
+	if len(skipped) != 3 {
+		t.Fatalf("skipped = %d, want 3: %+v", len(skipped), skipped)
+	}
+}
+
+func TestParseCloudDownloadLinksAcceptsMultilinePaste(t *testing.T) {
+	links, _ := parseCloudDownloadLinks([]string{
+		"magnet:?xt=urn:btih:0123456789abcdef0123456789abcdef01234567\nhttps://example.com/a.mkv\n",
+	})
+	if len(links) != 2 {
+		t.Fatalf("links = %d, want 2", len(links))
+	}
+}
+
+func TestMagnetInfoHashSupportsBase32(t *testing.T) {
+	got := magnetInfoHash("magnet:?xt=urn:btih:ABCDEFGHIJKLMNOPQRSTUVWXYZ234567")
+	if got != "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567" {
+		t.Fatalf("base32 hash = %q", got)
+	}
+	if got := magnetInfoHash("magnet:?dn=x"); got != "" {
+		t.Fatalf("missing btih should yield empty, got %q", got)
+	}
+}
+
+func TestOfflineErrorMessage(t *testing.T) {
+	cases := []struct {
+		code int
+		want string
+	}{
+		{1000012, "115 云下载配额已用尽，请在 115 端获取更多配额后重试"},
+		{91006, "115 存储空间不足"},
+		{20018, "115 找不到该种子文件（可能已被清理），请重新上传 .torrent"},
+		{1000011, "单批链接超过 115 条上限"},
+		{990002, "115 拒绝了提交参数：bad"},
+		{980004, "115 操作失败，请稍后重试"},
+	}
+	for _, c := range cases {
+		if got := offlineErrorMessage(c.code, "bad"); got != c.want {
+			t.Errorf("code %d => %q, want %q", c.code, got, c.want)
+		}
+	}
+	if got := offlineErrorMessage(1234, "原始信息"); got != "原始信息" {
+		t.Errorf("unknown code should keep 115 message, got %q", got)
+	}
+}
+
+func TestCloudDownloadDebounce(t *testing.T) {
+	db := newServiceTestDB(t)
+	repos := repository.New(db)
+	svc := NewCloudDownloadService(zap.NewNop(), repos, nil, nil, nil)
+
+	if !svc.debounceElapsed("p1") {
+		t.Fatal("first trigger must be allowed")
+	}
+	svc.noteTrigger("p1")
+	if svc.debounceElapsed("p1") {
+		t.Fatal("second trigger inside window must be suppressed")
+	}
+	// 另一个同步目录互不影响。
+	if !svc.debounceElapsed("p2") {
+		t.Fatal("debounce must be per sync path")
+	}
+	// 窗口置 0 表示不合并。
+	if err := repos.Setting.Set(context.Background(), CloudDownloadSettingSyncDebounce, "0"); err != nil {
+		t.Fatal(err)
+	}
+	if !svc.debounceElapsed("p1") {
+		t.Fatal("zero window should disable debounce")
+	}
+}
+
+func TestMatchLibraryRoot(t *testing.T) {
+	db := newServiceTestDB(t)
+	repos := repository.New(db)
+	ctx := context.Background()
+
+	lib := &model.Library{Name: "电影", Path: "/media/movies", Type: "movie", Enabled: true}
+	root := &model.LibraryRoot{LibraryID: "tmp", Path: "/media/movies", Enabled: true}
+	if err := repos.Library.CreateWithRoots(ctx, lib, []model.LibraryRoot{*root}); err != nil {
+		t.Fatal(err)
+	}
+
+	svc := NewCloudDownloadService(zap.NewNop(), repos, nil, nil, nil)
+	if got := svc.matchLibraryRoot(ctx, "/media/movies"); got == nil || got.LibraryID != lib.ID {
+		t.Fatalf("exact path should match library, got %+v", got)
+	}
+	if got := svc.matchLibraryRoot(ctx, "/media/movies/2024"); got == nil || got.LibraryID != lib.ID {
+		t.Fatalf("sub directory should match library, got %+v", got)
+	}
+	if got := svc.matchLibraryRoot(ctx, "/media/tv"); got != nil {
+		t.Fatalf("unrelated path must not match, got %+v", got)
+	}
+}
+
+func TestIsCloudDownloadTerminal(t *testing.T) {
+	terminal := []string{model.CloudDownloadSucceeded, model.CloudDownloadFailed, model.CloudDownloadCanceled}
+	for _, s := range terminal {
+		if !isCloudDownloadTerminal(s) {
+			t.Errorf("%s should be terminal", s)
+		}
+	}
+	for _, s := range []string{model.CloudDownloadQueued, model.CloudDownloadSubmitted, model.CloudDownloadDownloading} {
+		if isCloudDownloadTerminal(s) {
+			t.Errorf("%s should not be terminal", s)
+		}
+	}
+}
+
+func TestResolveTargetRejectsInvalidSyncPath(t *testing.T) {
+	db := newServiceTestDB(t)
+	repos := repository.New(db)
+	ctx := context.Background()
+	svc := NewCloudDownloadService(zap.NewNop(), repos, nil, nil, nil)
+
+	if _, err := svc.resolveTarget(ctx, ""); err == nil {
+		t.Fatal("empty sync path should fail")
+	}
+	if _, err := svc.resolveTarget(ctx, "missing"); err == nil {
+		t.Fatal("unknown sync path should fail")
+	}
+
+	// 远端目录为 0（网盘根目录）：离线文件永远扫不到，必须拒绝。
+	bad := &model.StrmSyncPath{
+		Name: "根目录", AccountID: "acc", Provider: model.StrmProvider115,
+		RemotePath: "0", LocalPath: "/media/root", Enabled: true,
+	}
+	if err := repos.StrmSyncPath.Create(ctx, bad); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := svc.resolveTarget(ctx, bad.ID); err == nil {
+		t.Fatal("remote root path should be rejected")
+	}
+
+	// 非 115 同步目录不支持云下载。
+	cd2 := &model.StrmSyncPath{
+		Name: "CD2", AccountID: "acc", Provider: model.StrmProviderCloudDrive,
+		RemotePath: "/movies", LocalPath: "/media/cd2", Enabled: true,
+	}
+	if err := repos.StrmSyncPath.Create(ctx, cd2); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := svc.resolveTarget(ctx, cd2.ID); err == nil {
+		t.Fatal("non-115 provider should be rejected")
+	}
+}
+
+func TestCloudDownloadSettingsDefaults(t *testing.T) {
+	db := newServiceTestDB(t)
+	svc := NewCloudDownloadService(zap.NewNop(), repository.New(db), nil, nil, nil)
+
+	if got := svc.pollInterval(); got != 60*time.Second {
+		t.Errorf("default poll interval = %v", got)
+	}
+	if got := svc.debounceWindow(); got != 30*time.Second {
+		t.Errorf("default debounce = %v", got)
+	}
+	if !svc.autoScrape() {
+		t.Error("auto scrape should default to true")
+	}
+	if got := svc.taskTimeout(); got != 72*time.Hour {
+		t.Errorf("default timeout = %v", got)
+	}
+	if got := svc.torrentMaxBytes(); got != 20<<20 {
+		t.Errorf("default torrent max = %d", got)
+	}
+	if got := svc.maxPollPages(); got != 10 {
+		t.Errorf("default max pages = %d", got)
+	}
+
+	// 越界值必须被夹紧，避免把轮询间隔配成 1 秒打爆 115 限流。
+	if err := repository.New(db).Setting.Set(context.Background(), CloudDownloadSettingPollInterval, "1"); err != nil {
+		t.Fatal(err)
+	}
+	if got := svc.pollInterval(); got != 30*time.Second {
+		t.Errorf("clamped poll interval = %v, want 30s", got)
+	}
+}
@@ -0,0 +1,254 @@
+package service
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/glebarez/sqlite"
+	"go.uber.org/zap"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+
+	"github.com/truewhile/MeBox/internal/config"
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+)
+
+// resetEmbyInvalThrottle 清掉全局失效节流，让测试能断言「这一次调用到底有
+// 没有真的清缓存」。测试结束后恢复原值，避免影响同包其他用例。
+func resetEmbyInvalThrottle(t *testing.T) {
+	t.Helper()
+	embyInvalMu.Lock()
+	previous := embyInvalLast
+	embyInvalLast = time.Time{}
+	embyInvalMu.Unlock()
+	t.Cleanup(func() {
+		embyInvalMu.Lock()
+		embyInvalLast = previous
+		embyInvalMu.Unlock()
+	})
+}
+
+func newCachedTestEmbyService(t *testing.T) *EmbyService {
+	t.Helper()
+	svc := newTestEmbyService(t)
+	cache := NewRuntimeCacheService(&config.Config{}, zap.NewNop())
+	t.Cleanup(func() { _ = cache.Close() })
+	return svc.SetRuntimeCache(cache)
+}
+
+// TestRecordProgressKeepsEmbyPayloadCache 覆盖首页加载慢的核心回归点：
+// 播放期间客户端每 5-10 秒上报一次进度，如果每次都清空 media:emby:*，
+// 客户端刷新首页时 73 个媒体库的 Latest 会全部回源重建（生产环境实测
+// 首批 8-25s）。普通进度上报必须保留载荷缓存；只有「已看完」翻转才失效。
+func TestRecordProgressKeepsEmbyPayloadCache(t *testing.T) {
+	svc := newCachedTestEmbyService(t)
+	const mediaID = "ep-1"
+	media := model.Media{
+		Base:        model.Base{ID: mediaID},
+		Title:       "第 1 集",
+		Path:        `/media/tv/Show/Season 01/S01E01.mkv`,
+		DurationSec: 100,
+	}
+	if err := svc.repo.DB.Create(&media).Error; err != nil {
+		t.Fatalf("create media: %v", err)
+	}
+
+	key := svc.embyLatestCacheKey("user-1", "", 16)
+	svc.cache.SetJSONWithStale(t.Context(), key, embyLatestCacheValue{
+		Items: []map[string]any{{"Id": "cached-item"}},
+	}, time.Minute, time.Hour)
+
+	resetEmbyInvalThrottle(t)
+	// 60s / 100s：播放中途
+	if err := svc.RecordProgressWithSession(t.Context(), "user-1", mediaID, 600_000_000, 1_000_000_000, "session-1"); err != nil {
+		t.Fatalf("record progress: %v", err)
+	}
+	if _, stale, ok := svc.cachedLatestItemsWithStale(t.Context(), key); !ok || stale {
+		t.Fatal("普通进度上报不应让 Emby 列表载荷缓存失效")
+	}
+
+	resetEmbyInvalThrottle(t)
+	// 98s / 100s：进入片尾 30s 内的「已看完」区间
+	if err := svc.RecordProgressWithSession(t.Context(), "user-1", mediaID, 980_000_000, 1_000_000_000, "session-2"); err != nil {
+		t.Fatalf("record completed progress: %v", err)
+	}
+	if _, _, ok := svc.cachedLatestItemsWithStale(t.Context(), key); ok {
+		t.Fatal("看完状态翻转后应让 Emby 列表载荷缓存失效")
+	}
+}
+
+// TestFindSeriesGroupCachesSiblingVirtualSeries 覆盖 N+1 回归点：一次全表
+// 扫描算出了整库的剧集分组，若只缓存命中的那一部，同一页的 16 张卡片和
+// 16 张海报会各自重扫一遍 media 表。批量记忆后同批分组都应可命中。
+func TestFindSeriesGroupCachesSiblingVirtualSeries(t *testing.T) {
+	svc := newTestEmbyService(t)
+	lib := model.Library{Name: "剧集", Path: `/media/tv`, Type: "tv", Enabled: true}
+	if err := svc.repo.Library.Create(t.Context(), &lib); err != nil {
+		t.Fatalf("create library: %v", err)
+	}
+
+	shows := []string{"Alpha", "Bravo", "Charlie"}
+	rows := make([]model.Media, 0, len(shows)*2)
+	for _, show := range shows {
+		for ep := 1; ep <= 2; ep++ {
+			rows = append(rows, model.Media{
+				Base:       model.Base{ID: show + "-" + strconv.Itoa(ep)},
+				LibraryID:  lib.ID,
+				Title:      show,
+				Path:       fmt.Sprintf("/media/tv/%s/Season 01/S01E%02d.mkv", show, ep),
+				SeasonNum:  1,
+				EpisodeNum: ep,
+			})
+		}
+	}
+	for i := range rows {
+		if err := svc.repo.DB.Create(&rows[i]).Error; err != nil {
+			t.Fatalf("create media: %v", err)
+		}
+	}
+
+	seriesIDs := map[string]string{}
+	for i := range rows {
+		if rows[i].EpisodeNum == 1 {
+			seriesIDs[rows[i].Title] = svc.seriesIDForMedia(t.Context(), &rows[i])
+		}
+	}
+	target, ok := seriesIDs["Alpha"]
+	if !ok {
+		t.Fatal("missing fixture series")
+	}
+	if _, found, err := svc.findSeriesGroup(t.Context(), target, ""); err != nil || !found {
+		t.Fatalf("findSeriesGroup(%s) = (%v, %v), want found", target, found, err)
+	}
+
+	for show, id := range seriesIDs {
+		if show == "Alpha" {
+			continue
+		}
+		if _, cached := svc.cachedSeriesGroup(id); !cached {
+			t.Fatalf("同一次扫描算出的 %s 应一并进入缓存，否则每张卡片/海报都会重扫整库", show)
+		}
+	}
+}
+
+// TestLatestPayloadKeepsStaleCopyForIdleClients 保证「最新添加」载荷在新鲜期
+// 之后仍有可用的陈旧副本：客户端空闲很久后再打开首页时，先拿陈旧结果并由
+// 后台重建，而不是让全部媒体库同时回源。
+func TestLatestPayloadKeepsStaleCopyForIdleClients(t *testing.T) {
+	svc := newCachedTestEmbyService(t)
+	key := svc.embyLatestCacheKey("user-1", "", 16)
+	svc.cache.SetJSONWithStale(t.Context(), key, embyLatestCacheValue{
+		Items: []map[string]any{{"Id": "stale-item"}},
+	}, time.Nanosecond, embyLatestStaleWindow)
+	time.Sleep(2 * time.Millisecond)
+
+	items, stale, ok := svc.cachedLatestItemsWithStale(t.Context(), key)
+	if !ok || !stale {
+		t.Fatalf("expected a stale hit, got ok=%v stale=%v", ok, stale)
+	}
+	if len(items) != 1 || items[0]["Id"] != "stale-item" {
+		t.Fatalf("unexpected stale payload: %#v", items)
+	}
+}
+
+// mediaScanCounter 统计真正落到 media 表上的查询次数，用来断言「整库数据
+// 只扫一次」：GORM 的 Trace 回调里能拿到最终 SQL。
+type mediaScanCounter struct {
+	logger.Interface
+	mu    sync.Mutex
+	scans int
+}
+
+func (c *mediaScanCounter) Trace(ctx context.Context, begin time.Time, fc func() (string, int64), err error) {
+	sql, _ := fc()
+	if strings.Contains(sql, "FROM `media`") {
+		c.mu.Lock()
+		c.scans++
+		c.mu.Unlock()
+	}
+}
+
+func (c *mediaScanCounter) Scans() int {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.scans
+}
+
+// TestVirtualSeriesLookupsShareOneScan 覆盖冷启动风暴的回归点：客户端刷新
+// 首页时 73 个库的卡片和海报各自要一个虚拟 series 分组。修好之后，第一次
+// 扫描把整库分组都写进缓存，同一页剩下的查询都不该再落 SQL；随后一个不存在
+// 的虚拟 ID 也不该反复触发整库重扫。
+func TestVirtualSeriesLookupsShareOneScan(t *testing.T) {
+	counter := &mediaScanCounter{Interface: logger.Discard}
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{Logger: counter})
+	if err != nil {
+		t.Fatalf("open db: %v", err)
+	}
+	if sqlDB, err := db.DB(); err == nil {
+		sqlDB.SetMaxOpenConns(1)
+		t.Cleanup(func() { _ = sqlDB.Close() })
+	}
+	if err := db.AutoMigrate(model.AllModels()...); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	svc := NewEmbyService(&config.Config{}, zap.NewNop(), repository.New(db))
+
+	lib := model.Library{Name: "剧集", Path: `/media/tv`, Type: "tv", Enabled: true}
+	if err := svc.repo.Library.Create(t.Context(), &lib); err != nil {
+		t.Fatalf("create library: %v", err)
+	}
+	shows := []string{"Alpha", "Bravo", "Charlie"}
+	rows := make([]model.Media, 0, len(shows)*2)
+	for _, show := range shows {
+		for ep := 1; ep <= 2; ep++ {
+			rows = append(rows, model.Media{
+				Base:       model.Base{ID: show + "-" + strconv.Itoa(ep)},
+				LibraryID:  lib.ID,
+				Title:      show,
+				Path:       fmt.Sprintf("/media/tv/%s/Season 01/S01E%02d.mkv", show, ep),
+				SeasonNum:  1,
+				EpisodeNum: ep,
+			})
+		}
+	}
+	for i := range rows {
+		if err := svc.repo.DB.Create(&rows[i]).Error; err != nil {
+			t.Fatalf("create media: %v", err)
+		}
+	}
+	seriesIDs := map[string]string{}
+	for i := range rows {
+		if rows[i].EpisodeNum == 1 {
+			seriesIDs[rows[i].Title] = svc.seriesIDForMedia(t.Context(), &rows[i])
+		}
+	}
+
+	if _, found, err := svc.findSeriesGroup(t.Context(), seriesIDs["Alpha"], ""); err != nil || !found {
+		t.Fatalf("findSeriesGroup(Alpha) = (%v, %v), want found", found, err)
+	}
+	if got := counter.Scans(); got != 1 {
+		t.Fatalf("首次查询应恰好扫描 media 一次，实际 %d 次", got)
+	}
+
+	for _, show := range []string{"Bravo", "Charlie"} {
+		if _, found, err := svc.findSeriesGroup(t.Context(), seriesIDs[show], ""); err != nil || !found {
+			t.Fatalf("findSeriesGroup(%s) = (%v, %v), want found", show, found, err)
+		}
+	}
+	if got := counter.Scans(); got != 1 {
+		t.Fatalf("同批分组应命中缓存，不应再扫 media，实际累计 %d 次", got)
+	}
+
+	if _, found, err := svc.findSeriesGroup(t.Context(), embyVirtualSeriesPrefix+"missing", ""); err != nil || found {
+		t.Fatalf("未知虚拟 ID 应为 not found，实际 found=%v err=%v", found, err)
+	}
+	if got := counter.Scans(); got != 1 {
+		t.Fatalf("刚扫过整库后，未知 ID 不应重扫 media，实际累计 %d 次", got)
+	}
+}
@@ -56,6 +56,17 @@ type EmbyService struct {
 	virtualSeries  map[string]embySeriesCacheEntry
 	virtualSeasons map[string]embySeasonCacheEntry
 	virtualArtwork map[string]embyArtworkCacheEntry
+	// virtualGroups 把「整库虚拟剧集分组」的扫描折叠成一次。
+	//
+	// 客户端刷新首页时会同时请求 73 个库的 Latest，每个库的卡片和海报都要
+	// 各自的虚拟 series 分组。不同剧的分组缓存键不同，singleflight 键也不同，
+	// 于是第一波请求会并发重扫整张 media 表（生产环境实测冷启动 14-17s）。
+	// 按用户折叠成一次扫描后，同一波请求共享结果并整批进缓存。
+	virtualGroups singleflight.Group
+	// virtualScanAt 记录每个用户最近一次整库扫描的时间，用于避免为同一个
+	// 不存在的 id 反复重扫（必须按用户区分：可见性不同，别人的快照不能当
+	// 自己的答案）。由 virtualMu 保护。
+	virtualScanAt map[string]time.Time

 	visibilityMu    sync.RWMutex
 	visibilityCache map[string]embyVisibilityCacheEntry
@@ -186,6 +197,15 @@ const (
 	embyVirtualSeriesCap  = 8000
 	embyVirtualSeasonCap  = 16000
 	embyVirtualArtworkCap = 24000
+	// embySeriesGroupBulkCacheEpisodes 限制一次批量记忆的剧集行数。
+	//
+	// 批量记忆把「一次扫描服务整页卡片 + 整页海报」的收益拿满，但同时让整库
+	// 剧集常驻内存。超过该量级时退回只缓存命中的那一部，避免大库吃光内存。
+	embySeriesGroupBulkCacheEpisodes = 8000
+	// embyVirtualScanGrace 是「刚做过整库虚拟剧集扫描」的保护窗口。窗口内再
+	// 请求一个不在缓存里的虚拟 series ID，直接按不存在处理，避免为同一个
+	// 未知 id 反复重扫整库。
+	embyVirtualScanGrace = 10 * time.Second
 	// Clients that already cached the 1x1 placeholder treat a stable tag as
 	// immutable. Virtual ids are the ones that served that placeholder, so
 	// only those tags get a suffix that forces a refetch.
@@ -325,8 +345,24 @@ func (e *EmbyService) Items(ctx context.Context, p ItemsParams) (map[string]any,
 		}
 	}

+	// 客户端刷新首页时常用 Movie,Series,Video 这种混合类型一次取「最新」行。
+	// 只有剧集库才该折叠成剧集卡片：seriesItemsForLibrary 只查
+	// (season_num>0 OR episode_num>0)，电影库走到这里会让整行返回 0 条。
 	if containsItemType(p.IncludeItemTypes, "Series") && !containsItemType(p.IncludeItemTypes, "Episode") {
-		return e.seriesItemsForLibrary(ctx, p.ParentID, p)
+		episodic := true
+		if p.ParentID != "" {
+			if value, err := e.libraryIsEpisodic(ctx, p.ParentID); err == nil {
+				episodic = value
+			}
+		}
+		if episodic {
+			return e.seriesItemsForLibrary(ctx, p.ParentID, p)
+		}
+		// 非剧集库：只请求 Series 时确实没有可返回的条目；混合类型则落回
+		// mediaItems，由它按 Movie 过滤，而不是整行判空。
+		if !containsItemType(p.IncludeItemTypes, "Movie") && !containsItemType(p.IncludeItemTypes, "Video") {
+			return emptyItemsEnvelope(p.StartIndex), nil
+		}
 	}

 	// 电影库的「常规浏览」(未指定 IncludeItemTypes): 电影库里偶尔混入按
@@ -6,6 +6,7 @@ import (
 	"sort"
 	"strconv"
 	"strings"
+	"time"
 )

 type embyItemsCacheValue struct {
@@ -77,7 +78,15 @@ func (e *EmbyService) embySimilarCacheKey(mediaID, userID string, limit int) str
 }

 // defaultEmbyLatestCacheTTLSeconds 是 Emby「最新添加」缓存的兜底时长。
-const defaultEmbyLatestCacheTTLSeconds = 300
+const defaultEmbyLatestCacheTTLSeconds = 900
+
+// embyLatestStaleWindow 是「最新添加」载荷在进程内保留的陈旧副本时长。
+//
+// 客户端空闲很久之后再打开首页时，新鲜期早已过去：生产环境观察到这时
+// 73 个媒体库的 Latest 同时回源，首批请求要 8-25s 才回来，客户端等不及
+// 还会重试，进一步放大压力。保留陈旧副本后，这类请求立刻拿到上次的结果，
+// 由后台异步重建（见 refreshLatestItemsAsync），用户不再等 SQL。
+const embyLatestStaleWindow = 24 * time.Hour

 // embyLatestCacheTTLSeconds 返回「最新添加」列表的缓存时长。它刻意比通用
 // 媒体缓存更长：客户端刷新首页时会同时请求全部媒体库的 Latest（生产环境
@@ -153,7 +153,7 @@ func (e *EmbyService) loadLatestItemsCached(ctx context.Context, userID, parentI
 		}
 		if e.cache != nil {
 			freshTTL := time.Duration(e.embyLatestCacheTTLSeconds()) * time.Second
-			e.cache.SetJSONWithStale(loadCtx, cacheKey, value, freshTTL, freshTTL+30*time.Minute)
+			e.cache.SetJSONWithStale(loadCtx, cacheKey, value, freshTTL, freshTTL+embyLatestStaleWindow)
 		}
 		e.rememberArtworkRefs(value.Artwork)
 		return value, nil
@@ -41,47 +41,65 @@ func (e *EmbyService) findSeriesGroup(ctx context.Context, id, userID string) (e
 		return embySeriesGroup{}, false, nil
 	}
 	if strings.HasPrefix(id, embyVirtualSeriesPrefix) {
-		if group, ok := e.cachedSeriesGroup(id); ok {
-			return group, true, nil
-		}
+		return e.findVirtualSeriesGroup(ctx, id, userID)
 	}
 	var rows []model.Media
 	q := e.repo.DB.WithContext(ctx).Model(&model.Media{}).Where("season_num > 0 OR episode_num > 0")
 	q = e.applyUserMediaVisibility(ctx, q, userID)
-	if !strings.HasPrefix(id, embyVirtualSeriesPrefix) {
-		q = q.Where("series_id = ?", id)
-	} else {
-		// 虚拟 series ID 只可能来自 series_id 为空的媒体：
-		// 有 series_id 时分组 key 就是 series_id 本身（UUID，不带虚拟前缀）。
-		q = q.Where("series_id IS NULL OR series_id = ''")
-	}
+	q = q.Where("series_id = ?", id)
 	if err := q.Order("media.season_num asc, media.episode_num asc, media.episode_fraction asc, media.created_at asc").Limit(embySeriesGroupingLimit).Find(&rows).Error; err != nil {
 		return embySeriesGroup{}, false, err
 	}
-	for _, group := range e.seriesGroupsFromMedia(ctx, rows) {
+	groups := e.seriesGroupsFromMedia(ctx, rows)
+	bulkCached := e.rememberScannedSeriesGroups(groups)
+	for _, group := range groups {
 		if group.ID == id {
-			e.rememberSeriesGroup(group)
+			if !bulkCached {
+				e.rememberSeriesGroup(group)
+			}
 			return group, true, nil
 		}
 	}
-	if !strings.HasPrefix(id, embyVirtualSeriesPrefix) {
-		if series, err := e.repo.Series.FindByID(ctx, id); err != nil {
-			return embySeriesGroup{}, false, err
-		} else if series != nil {
-			return embySeriesGroup{
-				ID:                 series.ID,
-				LibraryID:          series.LibraryID,
-				Name:               series.Title,
-				PosterURL:          series.PosterURL,
-				BackdropURL:        series.BackdropURL,
-				Overview:           series.Overview,
-				Rating:             series.Rating,
-				Year:               series.Year,
-				TMDbID:             series.TMDbID,
-				BangumiID:          series.BangumiID,
-				CreatedAt:          series.CreatedAt,
-				DateLastMediaAdded: series.CreatedAt,
-			}, true, nil
+	if series, err := e.repo.Series.FindByID(ctx, id); err != nil {
+		return embySeriesGroup{}, false, err
+	} else if series != nil {
+		return embySeriesGroup{
+			ID:                 series.ID,
+			LibraryID:          series.LibraryID,
+			Name:               series.Title,
+			PosterURL:          series.PosterURL,
+			BackdropURL:        series.BackdropURL,
+			Overview:           series.Overview,
+			Rating:             series.Rating,
+			Year:               series.Year,
+			TMDbID:             series.TMDbID,
+			BangumiID:          series.BangumiID,
+			CreatedAt:          series.CreatedAt,
+			DateLastMediaAdded: series.CreatedAt,
+		}, true, nil
+	}
+	return embySeriesGroup{}, false, nil
+}
+
+// findVirtualSeriesGroup 处理 series_id 为空的剧集分组（虚拟 series ID）。
+//
+// 虚拟 ID 是 hash(库名 + 剧名)，无法反解，只能整库算出分组后按 ID 取用。
+// 这里走 loadVirtualSeriesGroups，把同一用户的并发请求折叠成一次扫描：
+// 首页一次刷新会同时要 73 个库的卡片和海报，各扫一遍在 2 核主机上要 14-17s。
+func (e *EmbyService) findVirtualSeriesGroup(ctx context.Context, id, userID string) (embySeriesGroup, bool, error) {
+	if group, ok := e.cachedSeriesGroup(id); ok {
+		return group, true, nil
+	}
+	if e.virtualScanRecently(userID) {
+		return embySeriesGroup{}, false, nil
+	}
+	groups, err := e.loadVirtualSeriesGroups(ctx, userID)
+	if err != nil {
+		return embySeriesGroup{}, false, err
+	}
+	for _, group := range groups {
+		if group.ID == id {
+			return group, true, nil
 		}
 	}
 	return embySeriesGroup{}, false, nil
@@ -103,20 +121,14 @@ func (e *EmbyService) findSeasonGroup(ctx context.Context, id, userID string) (e
 		return season, true, nil
 	}
 	// 回退：未刮削（series_id 为空，虚拟 key 由库名+名称派生）的媒体只能全量分组。
-	var rows []model.Media
-	q := e.repo.DB.WithContext(ctx).Model(&model.Media{}).
-		Where("(series_id IS NULL OR series_id = '') AND (season_num > 0 OR episode_num > 0)")
-	q = e.applyUserMediaVisibility(ctx, q, userID)
-	if err := q.
-		Order("media.season_num asc, media.episode_num asc, media.episode_fraction asc, media.created_at asc").
-		Limit(embySeriesGroupingLimit).
-		Find(&rows).Error; err != nil {
+	// 复用共享扫描：首页并发刷新时整库只扫一次。
+	groups, err := e.loadVirtualSeriesGroups(ctx, userID)
+	if err != nil {
 		return embySeasonGroup{}, false, err
 	}
-	for _, series := range e.seriesGroupsFromMedia(ctx, rows) {
+	for _, series := range groups {
 		for _, season := range e.seasonsForSeries(series) {
 			if season.ID == id {
-				e.rememberSeriesGroup(series)
 				return season, true, nil
 			}
 		}
@@ -186,6 +198,84 @@ func (e *EmbyService) seasonGroupForSeries(ctx context.Context, id, seriesID, us
 	return embySeasonGroup{}, false, nil
 }

+// rememberScannedSeriesGroups 批量记住一次扫描得到的全部分组，返回是否真的
+// 批量写入（超过剧集预算时不做，调用方需自行缓存命中的那一部）。
+//
+// 只缓存命中的一部时，同一部剧的多张卡片/海报仍要各扫一次；整批写入后，
+// 同一次扫描算出来的其他剧也直接命中，于是整页 16 张卡片 + 16 张海报共用
+// 一次全表扫描。
+func (e *EmbyService) rememberScannedSeriesGroups(groups []embySeriesGroup) bool {
+	if e == nil || len(groups) == 0 {
+		return false
+	}
+	episodes := 0
+	for i := range groups {
+		episodes += len(groups[i].Episodes)
+		if episodes > embySeriesGroupBulkCacheEpisodes {
+			return false
+		}
+	}
+	e.rememberSeriesGroups(groups)
+	return true
+}
+
+// loadVirtualSeriesGroups 返回 series_id 为空的整库剧集分组。
+//
+// 同一用户的并发调用共享同一次扫描：客户端刷新首页时 73 个库的 Latest 同时
+// 进来，每个库的卡片和海报又各自要自己的虚拟 series 分组。分组缓存键各不
+// 相同，singleflight 也就不会合并，于是第一波请求把整张 media 表并发重算
+// 了 73 次（生产环境实测 14-17s）。这里按用户折叠成一次，结果整批进缓存，
+// 调用方拿到切片后按 ID 取用即可。
+func (e *EmbyService) loadVirtualSeriesGroups(ctx context.Context, userID string) ([]embySeriesGroup, error) {
+	if e == nil || e.repo == nil {
+		return nil, nil
+	}
+	v, err, _ := e.virtualGroups.Do("virtual:"+userID, func() (any, error) {
+		// 与 loadLatestItemsCached 一致：一个客户端断开不应取消正在为其他
+		// 客户端填充的共享扫描。
+		loadCtx, cancel := context.WithTimeout(context.WithoutCancel(ctx), 30*time.Second)
+		defer cancel()
+		var rows []model.Media
+		q := e.repo.DB.WithContext(loadCtx).Model(&model.Media{}).
+			Where("(series_id IS NULL OR series_id = '') AND (season_num > 0 OR episode_num > 0)")
+		q = e.applyUserMediaVisibility(loadCtx, q, userID)
+		if err := q.
+			Order("media.season_num asc, media.episode_num asc, media.episode_fraction asc, media.created_at asc").
+			Limit(embySeriesGroupingLimit).
+			Find(&rows).Error; err != nil {
+			return nil, err
+		}
+		groups := e.seriesGroupsFromMedia(loadCtx, rows)
+		e.rememberSeriesGroups(groups)
+		e.markVirtualScan(userID)
+		return groups, nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	groups, _ := v.([]embySeriesGroup)
+	return groups, nil
+}
+
+// markVirtualScan 记录该用户最近一次整库扫描的时间。
+func (e *EmbyService) markVirtualScan(userID string) {
+	e.virtualMu.Lock()
+	if e.virtualScanAt == nil {
+		e.virtualScanAt = make(map[string]time.Time, 4)
+	}
+	e.virtualScanAt[userID] = time.Now()
+	e.virtualMu.Unlock()
+}
+
+// virtualScanRecently 报告该用户是否刚做过一次整库扫描。窗口内仍不在缓存里
+// 的目标 ID 按不存在处理，避免为同一个未知 ID 反复重扫整库。
+func (e *EmbyService) virtualScanRecently(userID string) bool {
+	e.virtualMu.RLock()
+	scannedAt := e.virtualScanAt[userID]
+	e.virtualMu.RUnlock()
+	return !scannedAt.IsZero() && time.Since(scannedAt) < embyVirtualScanGrace
+}
+
 func (e *EmbyService) seriesGroupsFromMedia(ctx context.Context, rows []model.Media) []embySeriesGroup {
 	byID := map[string]*embySeriesGroup{}
 	order := []string{}
@@ -26,19 +26,45 @@ func (e *EmbyService) rememberSeriesGroup(group embySeriesGroup) {
 	if e == nil || strings.TrimSpace(group.ID) == "" {
 		return
 	}
+	e.rememberSeriesGroups([]embySeriesGroup{group})
+}
+
+// rememberSeriesGroups 批量记住一组剧集分组（含派生季与封面）。
+//
+// 一次全表扫描会同时算出整库的剧集分组，而调用方往往只关心其中一部。若只
+// 逐个 rememberSeriesGroup，同一次首页刷新里 16 张卡片 + 16 张海报都要各自
+// 命中自己的虚拟 series ID，未命中就重扫整张 media 表（生产环境实测单次
+// 1.3s，73 个库并发时把连接池排满，首页要 8-25s）。批量写入后冷缓存只付
+// 一次扫描，其余全部是 O(1) 命中。
+func (e *EmbyService) rememberSeriesGroups(groups []embySeriesGroup) {
+	if e == nil || len(groups) == 0 {
+		return
+	}
 	expiresAt := time.Now().Add(embyVirtualCacheTTL)
 	e.virtualMu.Lock()
 	defer e.virtualMu.Unlock()
 	if e.virtualSeries == nil {
-		e.virtualSeries = make(map[string]embySeriesCacheEntry)
+		e.virtualSeries = make(map[string]embySeriesCacheEntry, len(groups))
 	}
 	if e.virtualSeasons == nil {
-		e.virtualSeasons = make(map[string]embySeasonCacheEntry)
+		e.virtualSeasons = make(map[string]embySeasonCacheEntry, len(groups))
 	}
 	if e.virtualArtwork == nil {
-		e.virtualArtwork = make(map[string]embyArtworkCacheEntry)
+		e.virtualArtwork = make(map[string]embyArtworkCacheEntry, len(groups)*2)
 	}
+	for _, group := range groups {
+		e.rememberSeriesGroupLocked(group, expiresAt)
+	}
+	// 写入后再裁剪：逐条裁剪会让整批写入退化成 O(n²)，且中途裁剪可能把
+	// 同一批里刚写进去的分组又淘汰掉。
 	e.trimVirtualCachesLocked(time.Now())
+}
+
+// rememberSeriesGroupLocked 写入单个分组，调用方必须已持有 virtualMu。
+func (e *EmbyService) rememberSeriesGroupLocked(group embySeriesGroup, expiresAt time.Time) {
+	if strings.TrimSpace(group.ID) == "" {
+		return
+	}
 	e.virtualSeries[group.ID] = embySeriesCacheEntry{group: group, expiresAt: expiresAt}
 	e.virtualArtwork[group.ID] = embyArtworkCacheEntry{primary: group.PosterURL, backdrop: group.BackdropURL, expiresAt: expiresAt}
 	e.virtualArtwork[group.ID+"-bd"] = embyArtworkCacheEntry{primary: group.PosterURL, backdrop: group.BackdropURL, expiresAt: expiresAt}
@@ -2,6 +2,9 @@ package service

 import (
 	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"io"
 	"sort"
 	"strings"
 	"time"
@@ -278,6 +281,20 @@ func isSupportedEmbyCollectionType(t string) bool {
 	return false
 }

+// libraryCoverTag 生成媒体库拼图封面的图片版本号。
+//
+// 第三方客户端把库主图按 (URL, ImageTag) 缓存，tag 不变就不会重新请求。
+// 用成员海报列表的指纹做 tag，库内容变化或生成规则调整时客户端自然会刷新。
+func libraryCoverTag(libraryID string, sources []string) string {
+	h := sha256.New()
+	_, _ = io.WriteString(h, libraryID)
+	for _, src := range sources {
+		_, _ = io.WriteString(h, src)
+		_, _ = h.Write([]byte{0})
+	}
+	return libraryID + "-" + hex.EncodeToString(h.Sum(nil))[:8]
+}
+
 func (e *EmbyService) libraryAsView(ctx context.Context, l *model.Library) map[string]any {
 	collectionType := "movies"
 	switch l.Type {
@@ -292,9 +309,17 @@ func (e *EmbyService) libraryAsView(ctx context.Context, l *model.Library) map[s
 	}
 	// 库封面:与剧集/电影一样,只有在能解析出封面时才广告 ImageTags.Primary,
 	// 否则客户端会认为该库无主图而不去请求 /Images/Primary。
+	//
+	// 拼图封面的 tag 带上「成员海报」的指纹：库内容变化或生成规则调整（例如
+	// 从 2×2 改成竖切）时 tag 会变，客户端才会丢缓存重新拉图；固定用库 ID
+	// 会让第三方客户端永远显示第一次缓存下来的封面。
 	imageTags := map[string]string{}
-	if e.LibraryHasCover(ctx, l.ID) {
-		imageTags["Primary"] = l.ID
+	if sources, lib := LibraryCoverSourcesForLibrary(ctx, e.repo, l.ID); lib != nil {
+		if len(sources) > 0 {
+			imageTags["Primary"] = libraryCoverTag(l.ID, sources)
+		} else if strings.TrimSpace(lib.CoverURL) != "" {
+			imageTags["Primary"] = l.ID
+		}
 	}
 	return map[string]any{
 		"Id":                       l.ID,
@@ -136,7 +136,12 @@ func (e *EmbyService) RecordProgressWithSession(ctx context.Context, userID, med
 		SessionID:          playSessionID,
 		SessionStartedAtMs: embyPlaySessionStartedAtMs(playSessionID),
 	})
-	if err == nil {
+	// 普通进度上报不清列表载荷缓存。播放期间客户端每 5-10 秒上报一次，
+	// 每次清空 media:emby:* 会让「最新添加」整批 payload（客户端刷新首页时
+	// 一次并发 73 个库）反复回源 SQL，生产环境实测因此出现 8-25s 的加载。
+	// 续播位置由 /Items/Resume 与条目详情实时查库，列表里的进度条允许滞后；
+	// 只有「已看完」这类状态翻转才让缓存失效（position 到达片尾 30s 内）。
+	if err == nil && playbackProgressCompleted(pos, dur) {
 		e.invalidateEmbyItemsCache(ctx)
 	}
 	return err
@@ -287,10 +292,11 @@ func applyMeBoxUserData(raw any, history *model.PlaybackHistory, favorite bool)
 	return userData
 }

-// embyInvalMu 节流全量缓存失效：播放期间客户端每 5-10s 上报一次进度，
-// 每次都 SCAN+DEL 全部 media:emby:* 缓存会把缓存命中率持续打穿（其他
-// 客户端每次翻页都回源 SQL）。条目载荷的 UserData 在请求时动态合并，
-// 进度类变更做 30s 节流即可，不影响正确性观感。
+// embyInvalMu 节流全量缓存失效：收藏/标记已看这类显式操作会改变列表里的
+// UserData，必须让 payload 失效。客户端连续点选时会短时间触发多次，节流到
+// 30s 一次即可，避免每次都 SCAN+DEL 全部 media:emby:* 缓存。
+// 播放进度上报不走这里（见 RecordProgressWithSession）：续播位置实时查库，
+// 列表里的进度条允许滞后，不值得为它把整批首页载荷打回源 SQL。
 var (
 	embyInvalMu   sync.Mutex
 	embyInvalLast time.Time
@@ -144,3 +144,43 @@ func (c *Container) NormalizePollutedEpisodeMetadata(ctx context.Context) (int,
 	}
 	return cleaned, nil
 }
+
+// segmentRangeCleanupSettingKey marks the one-time removal of impossible
+// skip ranges written by the older end_ms: 0 interpretation.
+const segmentRangeCleanupSettingKey = "segment.range_cleanup_v1_done"
+
+// NormalizeImpossibleSegments 删除历史误写进来的「不可能区间」。
+//
+// 旧解析把 TheIntroDB 的 end_ms: 0 当成「延续到片尾」，于是
+// intro:[{start_ms:null,end_ms:0}] 被落成 intro (0, 0)，客户端补齐后覆盖整集；
+// 同理 recap (0,0) 也会让整集变成回顾。这类行只会让播放器一开播就弹跳过按钮，
+// 没有任何保留价值，直接硬删。
+//
+// 幂等：完成后写 setting 标记。只处理片头/回顾——片尾类允许开放结束点。
+func (c *Container) NormalizeImpossibleSegments(ctx context.Context) (int, error) {
+	if c == nil || c.Repo == nil || c.Repo.DB == nil {
+		return 0, nil
+	}
+	if c.Repo.Setting != nil {
+		if v, err := c.Repo.Setting.Get(ctx, segmentRangeCleanupSettingKey); err == nil && strings.TrimSpace(v) == "true" {
+			return 0, nil
+		}
+	}
+	res := c.Repo.DB.WithContext(ctx).Unscoped().
+		Where("kind IN ?", []string{model.SegmentKindIntro, model.SegmentKindRecap}).
+		Where("end_ms <= start_ms").
+		Delete(&model.MediaSegment{})
+	if res.Error != nil {
+		return 0, res.Error
+	}
+	cleaned := int(res.RowsAffected)
+	if c.Repo.Setting != nil {
+		if err := c.Repo.Setting.Set(ctx, segmentRangeCleanupSettingKey, "true"); err != nil && c.Log != nil {
+			c.Log.Warn("mark segment range cleanup done failed", zap.Error(err))
+		}
+	}
+	if cleaned > 0 && c.Log != nil {
+		c.Log.Info("impossible skip segments removed", zap.Int("rows", cleaned))
+	}
+	return cleaned, nil
+}
@@ -0,0 +1,109 @@
+package service
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"errors"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+	"unicode"
+)
+
+var ErrInvalidHLSPlaybackScope = errors.New("invalid HLS playback scope")
+var ErrHLSGenerationSuperseded = errors.New("HLS playback generation superseded")
+
+// HLSPlaybackScope separates a media's independent users and player instances.
+// UserID must come from server authentication, never from a request parameter.
+type HLSPlaybackScope struct {
+	UserID    string
+	SessionID string
+}
+
+func HLSPlaybackScopeForRequest(r *http.Request, userID string) (HLSPlaybackScope, error) {
+	scope := HLSPlaybackScope{UserID: strings.TrimSpace(userID)}
+	if scope.UserID == "" || r == nil {
+		return scope, ErrInvalidHLSPlaybackScope
+	}
+	for _, key := range []string{"session_id", "PlaySessionId", "playSessionId", "DeviceId", "deviceId"} {
+		if value := strings.TrimSpace(r.URL.Query().Get(key)); value != "" {
+			scope.SessionID = value
+			break
+		}
+	}
+	if scope.SessionID == "" {
+		if device := strings.TrimSpace(r.Header.Get("X-Emby-Device-Id")); device != "" {
+			scope.SessionID = device
+		}
+	}
+	if len(scope.SessionID) > 256 || strings.IndexFunc(scope.SessionID, unicode.IsControl) >= 0 {
+		return scope, ErrInvalidHLSPlaybackScope
+	}
+	// Clients without a session/device identifier remain compatible but only
+	// share a legacy task with the same authenticated user, never other users.
+	return scope, nil
+}
+
+func (scope HLSPlaybackScope) jobKey(mediaID string) string {
+	if scope.UserID == "" && scope.SessionID == "" {
+		return mediaID // Existing internal callers/tests retain their legacy API.
+	}
+	sum := sha256.Sum256([]byte(scope.UserID + "\x00" + mediaID + "\x00" + scope.SessionID))
+	return "player-" + hex.EncodeToString(sum[:])
+}
+
+func hlsPlaybackJobKey(mediaID string, scopes []HLSPlaybackScope) string {
+	if len(scopes) == 0 {
+		return mediaID
+	}
+	return scopes[0].jobKey(mediaID)
+}
+
+func (job *hlsJob) key() string {
+	if job.jobKey != "" {
+		return job.jobKey
+	}
+	return job.mediaID
+}
+
+func (t *TranscoderService) jobPlaylistPath(job *hlsJob) string {
+	dir := job.outputDir
+	if dir == "" {
+		dir = t.HLSDir(job.key())
+	}
+	return filepath.Join(dir, "index.m3u8")
+}
+
+// hlsOutputDir captures one immutable run directory. Even if a new run starts
+// after this check, the request cannot accidentally open its replacement files.
+func (t *TranscoderService) hlsOutputDir(key string, generation int64) (string, error) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	job := t.jobs[key]
+	if job == nil {
+		return "", ErrMediaNotFound
+	}
+	if job.seekGen != generation {
+		return "", ErrHLSGenerationSuperseded
+	}
+	t.touchJobLocked(key)
+	if job.outputDir != "" {
+		return job.outputDir, nil
+	}
+	return t.HLSDir(key), nil
+}
+
+func (t *TranscoderService) StopPlayback(mediaID string, scope HLSPlaybackScope) {
+	key := scope.jobKey(mediaID)
+	unlock := t.lockJobStart(key)
+	defer unlock()
+	t.mu.Lock()
+	job := t.detachJobLocked(key)
+	t.mu.Unlock()
+	waitJobExit(job, 12*time.Second)
+	// Keep cleanup under the same gate as start: a delayed stop must not wipe
+	// an output directory created by a concurrent replacement request.
+	_ = os.RemoveAll(t.HLSDir(key))
+}
@@ -0,0 +1,133 @@
+package service
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/config"
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+)
+
+func cachedScopedHLS(t *testing.T, scopes ...HLSPlaybackScope) (*StreamService, *TranscoderService, map[string]string) {
+	t.Helper()
+	cfg := &config.Config{}
+	cfg.Cache.CacheDir = t.TempDir()
+	cfg.Transcoder.Enabled = true
+	db := newServiceTestDB(t)
+	if err := db.Create(&model.Media{Base: model.Base{ID: "movie"}, Path: "unused-cached-source", DurationSec: 60}).Error; err != nil {
+		t.Fatal(err)
+	}
+	transcoder := NewTranscoderService(cfg, zap.NewNop(), repository.New(db), nil)
+	paths := map[string]string{}
+	for _, scope := range scopes {
+		key := scope.jobKey("movie")
+		dir := filepath.Join(transcoder.HLSDir(key), "run-cached")
+		if err := os.MkdirAll(dir, 0o750); err != nil {
+			t.Fatal(err)
+		}
+		playlist := filepath.Join(dir, "index.m3u8")
+		if err := os.WriteFile(playlist, []byte("#EXTM3U\n#EXTINF:4,\nseg_00000.ts\n"), 0o600); err != nil {
+			t.Fatal(err)
+		}
+		if err := os.WriteFile(filepath.Join(dir, "seg_00000.ts"), []byte(scope.UserID+"/"+scope.SessionID), 0o600); err != nil {
+			t.Fatal(err)
+		}
+		transcoder.jobs[key] = &hlsJob{mediaID: "movie", jobKey: key, outputDir: dir, subtitleStream: -1, startedAt: time.Now(), cancel: func() {}}
+		paths[key] = playlist
+	}
+	return NewStreamService(cfg, zap.NewNop(), repository.New(db), transcoder), transcoder, paths
+}
+
+func TestHLSPlaybackEnsureReusesOnlyMatchingOwnerAndSession(t *testing.T) {
+	a := HLSPlaybackScope{UserID: "viewer", SessionID: "tab-a"}
+	b := HLSPlaybackScope{UserID: "viewer", SessionID: "tab-b"}
+	_, transcoder, paths := cachedScopedHLS(t, a, b)
+	for _, scope := range []HLSPlaybackScope{a, b} {
+		playlist, err := transcoder.EnsureJobFromSubtitleQuality(t.Context(), "movie", 0, 0, -1, "", scope)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if playlist != paths[scope.jobKey("movie")] {
+			t.Fatalf("scope %#v reused another session's playlist %q", scope, playlist)
+		}
+	}
+}
+
+func TestHLSPlaybackStopRemovesOnlyItsSessionOutput(t *testing.T) {
+	a := HLSPlaybackScope{UserID: "viewer", SessionID: "tab-a"}
+	b := HLSPlaybackScope{UserID: "viewer", SessionID: "tab-b"}
+	_, transcoder, paths := cachedScopedHLS(t, a, b)
+	transcoder.StopPlayback("movie", a)
+	if _, err := os.Stat(paths[a.jobKey("movie")]); !os.IsNotExist(err) {
+		t.Fatalf("stopped session output must be cleaned up, err=%v", err)
+	}
+	if _, err := os.Stat(paths[b.jobKey("movie")]); err != nil {
+		t.Fatalf("another player's output was removed: %v", err)
+	}
+}
+
+func TestHLSPlaybackIdleCleanupRemovesExpiredSessionOutput(t *testing.T) {
+	a := HLSPlaybackScope{UserID: "viewer", SessionID: "tab-a"}
+	b := HLSPlaybackScope{UserID: "viewer", SessionID: "tab-b"}
+	_, transcoder, paths := cachedScopedHLS(t, a, b)
+	job := transcoder.jobs[a.jobKey("movie")]
+	job.lastAccess = time.Now().Add(-2 * time.Minute)
+	if !transcoder.stopIdleJob(job, time.Minute) {
+		t.Fatal("expired session was not stopped")
+	}
+	if _, err := os.Stat(paths[a.jobKey("movie")]); !os.IsNotExist(err) {
+		t.Fatalf("expired output was retained: %v", err)
+	}
+	if _, err := os.Stat(paths[b.jobKey("movie")]); err != nil {
+		t.Fatalf("active session output was removed: %v", err)
+	}
+}
+
+func TestHLSPlaybackPropagatesHeaderDeviceIdentityToSegments(t *testing.T) {
+	req := httptest.NewRequest(http.MethodGet, "/api/hls/movie/index.m3u8?token=test", nil)
+	req.Header.Set("X-Emby-Device-Id", "legacy-device")
+	scope, err := HLSPlaybackScopeForRequest(req, "viewer")
+	if err != nil {
+		t.Fatal(err)
+	}
+	svc, _, _ := cachedScopedHLS(t, scope)
+	rec := httptest.NewRecorder()
+	if err := svc.ServeHLSPlaylist(rec, req, "movie", scope); err != nil {
+		t.Fatal(err)
+	}
+	var segment string
+	for _, line := range strings.Split(rec.Body.String(), "\n") {
+		if strings.HasPrefix(line, "seg_") {
+			segment = line
+			break
+		}
+	}
+	u, err := url.Parse(segment)
+	if err != nil || u.Query().Get("session_id") == "" {
+		t.Fatalf("playlist must carry the header-only device scope to child URLs: %q err=%v", segment, err)
+	}
+	child := httptest.NewRequest(http.MethodGet, "/api/hls/movie/"+segment, nil)
+	childScope, err := HLSPlaybackScopeForRequest(child, "viewer")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if childScope.jobKey("movie") != scope.jobKey("movie") {
+		t.Fatal("child request changed its owner's device scope")
+	}
+	childRec := httptest.NewRecorder()
+	if err := svc.ServeHLSSegment(childRec, child, "movie", "seg_00000.ts", childScope); err != nil {
+		t.Fatal(err)
+	}
+	if childRec.Body.String() != "viewer/"+scope.SessionID {
+		t.Fatalf("wrong scoped segment: %s", childRec.Body.String())
+	}
+}
@@ -0,0 +1,97 @@
+package service
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/config"
+)
+
+func TestHLSPlaybackScopesIsolateSegmentReadsAndStop(t *testing.T) {
+	cfg := &config.Config{}
+	cfg.Cache.CacheDir = t.TempDir()
+	transcoder := NewTranscoderService(cfg, zap.NewNop(), nil, nil)
+	svc := NewStreamService(cfg, zap.NewNop(), nil, transcoder)
+	a := HLSPlaybackScope{UserID: "user-a", SessionID: "tab-a"}
+	b := HLSPlaybackScope{UserID: "user-b", SessionID: "tab-a"}
+	c := HLSPlaybackScope{UserID: "user-a", SessionID: "tab-c"}
+	for _, scope := range []HLSPlaybackScope{a, b, c} {
+		key := scope.jobKey("movie")
+		dir := filepath.Join(cfg.Cache.CacheDir, key, "run-current")
+		if err := os.MkdirAll(dir, 0o750); err != nil {
+			t.Fatal(err)
+		}
+		if err := os.WriteFile(filepath.Join(dir, "seg_00000.ts"), []byte(scope.UserID+"/"+scope.SessionID), 0o600); err != nil {
+			t.Fatal(err)
+		}
+		transcoder.jobs[key] = &hlsJob{mediaID: "movie", jobKey: key, outputDir: dir, seekGen: 100, cancel: func() {}}
+	}
+	for _, scope := range []HLSPlaybackScope{a, b, c} {
+		req := httptest.NewRequest(http.MethodGet, "/api/hls/movie/seg_00000.ts?_seek=100", nil)
+		rec := httptest.NewRecorder()
+		if err := svc.ServeHLSSegment(rec, req, "movie", "seg_00000.ts", scope); err != nil {
+			t.Fatal(err)
+		}
+		if got, want := rec.Body.String(), scope.UserID+"/"+scope.SessionID; got != want {
+			t.Fatalf("segment=%q, want %q", got, want)
+		}
+	}
+	transcoder.StopPlayback("movie", a)
+	if transcoder.jobs[a.jobKey("movie")] != nil {
+		t.Fatal("stopped scope is still active")
+	}
+	if transcoder.jobs[b.jobKey("movie")] == nil || transcoder.jobs[c.jobKey("movie")] == nil {
+		t.Fatal("stopping one player affected another user/tab")
+	}
+	// A delayed stop from a previous local-playback session must not affect a replacement.
+	transcoder.StopPlayback("movie", a)
+	if transcoder.jobs[c.jobKey("movie")] == nil {
+		t.Fatal("old stop cancelled a new session")
+	}
+}
+
+func TestHLSPlaybackRejectsStaleSegmentGeneration(t *testing.T) {
+	cfg := &config.Config{}
+	cfg.Cache.CacheDir = t.TempDir()
+	transcoder := NewTranscoderService(cfg, zap.NewNop(), nil, nil)
+	svc := NewStreamService(cfg, zap.NewNop(), nil, transcoder)
+	scope := HLSPlaybackScope{UserID: "viewer", SessionID: "tab"}
+	key := scope.jobKey("movie")
+	dir := t.TempDir()
+	if err := os.WriteFile(filepath.Join(dir, "seg_00000.ts"), []byte("new-generation"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	transcoder.jobs[key] = &hlsJob{mediaID: "movie", jobKey: key, outputDir: dir, seekGen: 200, cancel: func() {}}
+	req := httptest.NewRequest(http.MethodGet, "/api/hls/movie/seg_00000.ts?_seek=100", nil)
+	rec := httptest.NewRecorder()
+	if err := svc.ServeHLSSegment(rec, req, "movie", "seg_00000.ts", scope); err == nil {
+		t.Fatal("stale segment request read a replacement generation")
+	}
+	if rec.Body.Len() != 0 {
+		t.Fatal("stale request exposed replacement bytes")
+	}
+}
+
+func TestHLSPlaybackScopeRequiresServerOwner(t *testing.T) {
+	req := httptest.NewRequest(http.MethodGet, "/?session_id=tab&user_id=attacker-controlled", nil)
+	if _, err := HLSPlaybackScopeForRequest(req, ""); err == nil {
+		t.Fatal("missing authenticated owner was accepted")
+	}
+	a, err := HLSPlaybackScopeForRequest(req, "real-owner")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if a.UserID != "real-owner" {
+		t.Fatal("client parameter supplied the owner")
+	}
+	req = httptest.NewRequest(http.MethodGet, "/?PlaySessionId=emby-session", nil)
+	b, err := HLSPlaybackScopeForRequest(req, "real-owner")
+	if err != nil || b.SessionID == "" {
+		t.Fatalf("Emby session must stay scoped: %#v %v", b, err)
+	}
+}
@@ -49,6 +49,10 @@ type ImageProxy struct {
 	resizeSemMu sync.Mutex
 	resizeSem   chan struct{}

+	// resizeQueueWait 是一次请求最多为一格解码槽排队的时长。为 0 时用
+	// defaultResizeQueueWait；测试会把它调小以免真的等待两秒。
+	resizeQueueWait time.Duration
+
 	// libraryRootsFn returns the configured media library roots so that
 	// sidecar poster/artwork files stored alongside media (under arbitrary
 	// per-library paths) are allowed by isAllowedLocalPath. It is provided
@@ -86,6 +90,12 @@ const (
 	// imageRenditionCacheSubdir 存放挂载 Emby 直接按尺寸产出的成品图：它们
 	// 已经是客户端要的最终尺寸，和派生缩略图一样属于长期保留的热路径缓存。
 	imageRenditionCacheSubdir = "renditions"
+
+	// defaultResizeQueueWait 是请求为一格解码槽排队的最长时间。一张 3MP
+	// 海报的解码+缩放约 0.15s，2 核机器两格槽位足以在几秒内消化一整屏
+	// 海报；等待远好于「槽位忙就回退多兆字节原图」（那样每张图在外部网络
+	// 下要十几秒）。超时后仍回退原图，保证请求不会被无限期挂住。
+	defaultResizeQueueWait = 3 * time.Second
 )

 // NewImageProxy is the constructor.
@@ -189,21 +199,19 @@ func imageResizeConcurrency() int {
 	return n
 }

-// Prune removes oldest cached images until disk usage is within the configured limit.
-// 原图池按独立配额与保留时长优先淘汰，客户端热路径读取的成品图最后淘汰。
+// Prune 只执行图片原图子配额与旧缓存清理；整个磁盘缓存的总量淘汰由调度器的
+// cache_cleanup 任务（PruneCache）负责。
 func (p *ImageProxy) Prune() (PruneImageCacheResult, error) {
-	if p.cfg == nil || p.cfg.Cache.ImagesMaxSizeMB <= 0 {
+	if p.cfg == nil {
 		return PruneImageCacheResult{}, nil
 	}
 	var originalsMaxBytes int64
 	if p.cfg.Cache.ImagesOriginalsMaxSizeMB > 0 {
 		originalsMaxBytes = int64(p.cfg.Cache.ImagesOriginalsMaxSizeMB) * 1024 * 1024
 	}
-	var originalsMaxAge time.Duration
-	if p.cfg.Cache.ImagesOriginalsTTLHours > 0 {
-		originalsMaxAge = time.Duration(p.cfg.Cache.ImagesOriginalsTTLHours) * time.Hour
+	if originalsMaxBytes <= 0 {
+		return PruneImageCacheResult{}, nil
 	}
-	totalBytes := int64(p.cfg.Cache.ImagesMaxSizeMB) * 1024 * 1024
-	pools := ImageCachePools(p.cacheDir, originalsMaxBytes, originalsMaxAge)
-	return PruneImageCachePools(pools, totalBytes)
+	pools := ImageCachePools(p.cacheDir, originalsMaxBytes)
+	return PruneImageCachePools(pools, 0)
 }
@@ -17,6 +17,7 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"time"

 	"go.uber.org/zap"

@@ -138,8 +139,8 @@ func fitSize(srcW, srcH, maxW, maxH int) (int, int) {

 var errImageResizeTooLarge = errors.New("image source exceeds resize pixel budget")

-// resizeImageData 按选项缩放图片并重新编码。返回 unchanged=true 表示原图
-// 本身已满足目标尺寸，调用方应直接输出原始字节（不重复编码、不损失质量）。
+// resizeImageData 按选项缩放图片并重新编码。返回 unchanged=true 表示源图
+// 已经是可直接下发的紧凑字节，调用方应直接输出原始字节（不重复编码）。
 func resizeImageData(data []byte, o imageResizeOptions) (out []byte, ctype string, unchanged bool, err error) {
 	if len(data) == 0 || !o.active() {
 		return data, detectContentType(data), true, nil
@@ -151,12 +152,21 @@ func resizeImageData(data []byte, o imageResizeOptions) (out []byte, ctype strin
 	if cfg.Width <= 0 || cfg.Height <= 0 {
 		return nil, "", false, errors.New("invalid image dimensions")
 	}
-	// 先用 DecodeConfig 判断是否需要解码整图：图已够小就零成本返回原字节。
+	// 先用 DecodeConfig 判断是否需要缩放。尺寸已在目标框内时仍要重编码：
+	// 刮削来源的海报常是 1000×1500、1MB 以上的 PNG，直接原样下发会让一处
+	// 海报墙就从「几十 KB 缩略图」变成「几十 MB 原图」——外部网络下每张
+	// 都要十几秒。只有本来就是紧凑 Web 格式（JPEG/WebP）且体积很小的源图
+	// 才值得零成本直出。
 	dstW, dstH := fitSize(cfg.Width, cfg.Height, o.MaxWidth, o.MaxHeight)
-	if dstW == cfg.Width && dstH == cfg.Height {
+	unchangedSize := dstW == cfg.Width && dstH == cfg.Height
+	if unchangedSize && isCompactWebFormat(format) && len(data) <= compactImageSkipBytes {
 		return data, detectContentType(data), true, nil
 	}
 	if int64(cfg.Width)*int64(cfg.Height) > imageResizeMaxSourcePixels {
+		if unchangedSize {
+			// 尺寸已满足但像素量超出解码预算：宁可直出原图，也不冒 OOM 风险。
+			return data, detectContentType(data), true, nil
+		}
 		return nil, "", false, errImageResizeTooLarge
 	}

@@ -165,7 +175,12 @@ func resizeImageData(data []byte, o imageResizeOptions) (out []byte, ctype strin
 		return nil, "", false, err
 	}
 	dst := image.NewRGBA(image.Rect(0, 0, dstW, dstH))
-	resizeScaled(dst, src, cfg.Width, cfg.Height)
+	if unchangedSize {
+		// 不缩放时省掉一次全图重采样，只做格式转换。
+		draw.Draw(dst, dst.Bounds(), src, src.Bounds().Min, draw.Src)
+	} else {
+		resizeScaled(dst, src, cfg.Width, cfg.Height)
+	}

 	// 只有可能带透明的源格式才需要逐像素确认，避免 JPEG 的无谓遍历。
 	// 写实海报的 PNG 通常比等价 JPEG 大一个数量级，因此在确认不含透明
@@ -231,9 +246,12 @@ func isOpaqueImage(img *image.RGBA) bool {
 // resizeSourceKey 生成源图身份键：只覆盖源文件身份（路径 + 大小 + mtime），不含
 // 目标尺寸。同一源图的所有尺寸档位共用这个前缀，才能互相列举与派生（小图直接
 // 从已缓存的大图缩小，而不是重新解码原图）。
+//
+// 前缀里的 v3 是缓存格式版本：v2 时期「尺寸已在目标框内」的 PNG 会原样直出、
+// 不写缓存，而现在同样条件会重编码成 JPEG，旧缓存与新结果语义不同，必须换键。
 func (o imageResizeOptions) resizeSourceKey(sourceID string, stat os.FileInfo) string {
 	h := sha256.New()
-	_, _ = fmt.Fprintf(h, "v2|%s", sourceID)
+	_, _ = fmt.Fprintf(h, "v3|%s", sourceID)
 	if stat != nil {
 		_, _ = fmt.Fprintf(h, "|%d|%d", stat.Size(), stat.ModTime().UnixNano())
 	}
@@ -356,13 +374,53 @@ func (p *ImageProxy) tryAcquireResizeSlot() (func(), bool) {
 	}
 }

-// acquireResizeSlotFor 对中等体积的图只尝试一次槽位。忙则放弃缩放，
-// 避免背景图墙在 2 核机器上排成数秒。超大原图仍等待，以免直出多兆字节。
+func (p *ImageProxy) resizeQueueTimeout() time.Duration {
+	if p != nil && p.resizeQueueWait > 0 {
+		return p.resizeQueueWait
+	}
+	return defaultResizeQueueWait
+}
+
+// acquireResizeSlotFor 对紧凑小图只尝试一次槽位，其余情况最多排队
+// resizeQueueTimeout。
+//
+// 从前这里对 1.5MB 以下的图一律「槽位忙就跳过缩放」，结果是并发加载海报墙
+// 时几乎每张图都回退成 1MB 上下的 PNG 原图：一页要传几十 MB，外部网络下单张
+// 图就要二十多秒。缩略图本身只有几十 KB，排队几百毫秒明显更划算；只有真正
+// 大到会拖慢页面的原图才值得在超时后直出。
 func (p *ImageProxy) acquireResizeSlotFor(ctx context.Context, size int64) (func(), bool) {
-	if size > 0 && size <= resizeQueueBypassBytes {
+	if size > 0 && size <= compactImageSkipBytes {
 		return p.tryAcquireResizeSlot()
 	}
-	return p.acquireResizeSlot(ctx)
+	return p.acquireResizeSlotWithin(ctx, p.resizeQueueTimeout())
+}
+
+// acquireResizeSlotWithin 在 timeout 内等待一格解码槽；超时或请求取消返回
+// false，调用方回退原图。
+func (p *ImageProxy) acquireResizeSlotWithin(ctx context.Context, timeout time.Duration) (func(), bool) {
+	if p == nil {
+		return func() {}, true
+	}
+	if timeout <= 0 {
+		return p.tryAcquireResizeSlot()
+	}
+	p.resizeSemMu.Lock()
+	if p.resizeSem == nil {
+		p.resizeSem = make(chan struct{}, imageResizeConcurrency())
+	}
+	sem := p.resizeSem
+	p.resizeSemMu.Unlock()
+
+	timer := time.NewTimer(timeout)
+	defer timer.Stop()
+	select {
+	case sem <- struct{}{}:
+		return func() { <-sem }, true
+	case <-timer.C:
+		return nil, false
+	case <-ctx.Done():
+		return nil, false
+	}
 }

 // serveResizedFromFile 从 srcPath 读取图片，按选项缩放后写出，并把结果缓存
@@ -472,10 +530,6 @@ func (p *ImageProxy) ensureResizeCache(ctx context.Context, srcPath string, o im
 // ponytail: 200KB 覆盖这台机器上的典型海报（平均约 100KB）；更大的图仍尝试缩放。
 const compactImageSkipBytes = 200 * 1024

-// resizeQueueBypassBytes 是“槽位忙就放弃缩放”的上限。超过它的原图继续排队，
-// 以免把未压缩的剧照直接发给客户端。
-const resizeQueueBypassBytes = 1536 * 1024
-
 // serveCompactOriginal 在源文件已经很小且是浏览器可直接显示的 JPEG/WebP 时
 // 跳过解码。返回 false 表示仍应走缩放路径。
 func serveCompactOriginal(w http.ResponseWriter, r *http.Request, srcPath string, stat os.FileInfo) bool {
@@ -504,6 +558,17 @@ func isCompactWebImage(header []byte) bool {
 		string(header[8:12]) == "WEBP"
 }

+// isCompactWebFormat 判断 image.DecodeConfig 报告的格式是否已经适合直接下发
+// 给浏览器。PNG/BMP/GIF 即使尺寸很小也可能有几百 KB，需要重编码成 JPEG。
+func isCompactWebFormat(format string) bool {
+	switch strings.ToLower(format) {
+	case "jpeg", "jpg", "webp":
+		return true
+	default:
+		return false
+	}
+}
+
 // writeResizeCache 原子写入缩放结果；失败只记日志，不影响本次响应。
 // 与 writeImageCache 一样不再持有全局锁：临时文件名唯一、rename 原子，
 // 持锁只会把缩略图的写盘和原图的写盘串成一条队。
@@ -123,17 +123,58 @@ func TestResizeImageDataScalesDownAndReencodesAsJPEG(t *testing.T) {
 	}
 }

-func TestResizeImageDataLeavesImagesWithinBoundsUntouched(t *testing.T) {
+// 尺寸已经在目标框内的 PNG 也必须转成 JPEG。刮削来的海报常是 1000×1500、
+// 1MB 级的 PNG；此前这种情况原样直出，一处海报墙就要下载几十 MB，外部网络下
+// 每张图要十几秒（线上实测单张 1.3MB / 20 多秒）。
+func TestResizeImageDataReencodesPNGWithinBounds(t *testing.T) {
 	data := encodeTestPNG(t, 200, 300, 255)
-	out, _, unchanged, err := resizeImageData(data, imageResizeOptions{MaxWidth: 400, MaxHeight: 600})
+	out, ctype, unchanged, err := resizeImageData(data, imageResizeOptions{MaxWidth: 400, MaxHeight: 600, Quality: 80})
+	if err != nil {
+		t.Fatalf("resize: %v", err)
+	}
+	if unchanged {
+		t.Fatal("PNG within the target box must still be re-encoded as a compact web format")
+	}
+	if ctype != "image/jpeg" {
+		t.Fatalf("content type = %q, want image/jpeg", ctype)
+	}
+	cfg, format, err := image.DecodeConfig(bytes.NewReader(out))
+	if err != nil {
+		t.Fatalf("decode re-encoded image: %v", err)
+	}
+	if format != "jpeg" {
+		t.Fatalf("format = %q, want jpeg", format)
+	}
+	if cfg.Width != 200 || cfg.Height != 300 {
+		t.Fatalf("re-encoded to %dx%d, want the original 200x300 (no upscaling)", cfg.Width, cfg.Height)
+	}
+}
+
+// 已经是紧凑 Web 格式且体积很小的源图仍然零成本直出。
+func TestResizeImageDataLeavesSmallCompactSourceUntouched(t *testing.T) {
+	var buf bytes.Buffer
+	img := image.NewRGBA(image.Rect(0, 0, 200, 300))
+	for y := 0; y < 300; y++ {
+		for x := 0; x < 200; x++ {
+			img.Set(x, y, color.RGBA{R: uint8(x % 16 * 16), G: uint8(y % 16 * 16), B: 200, A: 255})
+		}
+	}
+	if err := jpeg.Encode(&buf, img, &jpeg.Options{Quality: 80}); err != nil {
+		t.Fatalf("encode test jpeg: %v", err)
+	}
+	data := buf.Bytes()
+	if len(data) > compactImageSkipBytes {
+		t.Fatalf("test jpeg is %d bytes, expected a compact source", len(data))
+	}
+	out, ctype, unchanged, err := resizeImageData(data, imageResizeOptions{MaxWidth: 400, MaxHeight: 600})
 	if err != nil {
 		t.Fatalf("resize: %v", err)
 	}
 	if !unchanged {
-		t.Fatal("expected an image already within bounds to be returned unchanged")
+		t.Fatal("a compact JPEG already within bounds should be served unchanged")
 	}
-	if !bytes.Equal(out, data) {
-		t.Fatal("expected the original bytes to be returned verbatim")
+	if !bytes.Equal(out, data) || ctype != "image/jpeg" {
+		t.Fatalf("expected the original jpeg bytes back, got %d bytes of %q", len(out), ctype)
 	}
 }

@@ -302,7 +343,9 @@ func TestServeResizedFromFileSkipsDecodeForCompactJPEG(t *testing.T) {
 	}
 }

-func TestServeResizedFromFileDoesNotQueueWhenResizeBusy(t *testing.T) {
+// 排队上限：槽位一直不空时，请求最多等 resizeQueueWait，然后回退原图，
+// 不会被无限期挂住。这条约束保护的是请求本身，而不是「不等就直出原图」。
+func TestServeResizedFromFileFallsBackWhenResizeQueueStaysBusy(t *testing.T) {
 	dir := t.TempDir()
 	src := dir + string(os.PathSeparator) + "backdrop.jpg"
 	data := make([]byte, compactImageSkipBytes+1024)
@@ -310,7 +353,7 @@ func TestServeResizedFromFileDoesNotQueueWhenResizeBusy(t *testing.T) {
 	if err := os.WriteFile(src, data, 0o644); err != nil {
 		t.Fatalf("write source: %v", err)
 	}
-	proxy := &ImageProxy{cacheDir: dir + string(os.PathSeparator) + "cache"}
+	proxy := &ImageProxy{cacheDir: dir + string(os.PathSeparator) + "cache", resizeQueueWait: 50 * time.Millisecond}
 	var releases []func()
 	for i := 0; i < imageResizeConcurrency(); i++ {
 		release, ok := proxy.acquireResizeSlot(context.Background())
@@ -327,10 +370,77 @@ func TestServeResizedFromFileDoesNotQueueWhenResizeBusy(t *testing.T) {

 	start := time.Now()
 	handled := proxy.serveResizedFromFile(httptest.NewRecorder(), httptest.NewRequest("GET", "/x?maxWidth=480", nil), src, imageResizeOptions{MaxWidth: 480})
-	if time.Since(start) > 200*time.Millisecond {
-		t.Fatal("resize slot was busy but the request still waited in the queue")
+	if elapsed := time.Since(start); elapsed > 500*time.Millisecond {
+		t.Fatalf("request waited %v with every slot held; the queue wait must be bounded", elapsed)
 	}
 	if handled {
-		t.Fatal("expected a busy resize slot to fall back so the caller can serve the original")
+		t.Fatal("expected a permanently busy queue to fall back so the caller can serve the original")
+	}
+}
+
+// 槽位只是短暂忙碌时必须排队等待并产出缩略图，而不是直出多兆字节原图。
+// 这是线上「海报墙每张图 20 多秒」的根因：并发加载时槽位全忙，旧逻辑把
+// 1MB 级 PNG 原样下发。
+// encodeNoisyPNG 生成难以压缩的 PNG：规则色块会被压到 1KB 级别，测不出
+// 「大体积 PNG 被原样下发」这条回归。
+func encodeNoisyPNG(t *testing.T, w, h int) []byte {
+	t.Helper()
+	img := image.NewRGBA(image.Rect(0, 0, w, h))
+	seed := uint32(0x9e3779b9)
+	for y := 0; y < h; y++ {
+		for x := 0; x < w; x++ {
+			seed = seed*1664525 + 1013904223
+			img.Set(x, y, color.RGBA{R: uint8(seed >> 24), G: uint8(seed >> 16), B: uint8(seed >> 8), A: 255})
+		}
+	}
+	var buf bytes.Buffer
+	if err := png.Encode(&buf, img); err != nil {
+		t.Fatalf("encode noisy png: %v", err)
+	}
+	return buf.Bytes()
+}
+
+func TestServeResizedFromFileWaitsForSlotInsteadOfServingOriginal(t *testing.T) {
+	dir := t.TempDir()
+	src := dir + string(os.PathSeparator) + "poster.png"
+	original := encodeNoisyPNG(t, 378, 540)
+	if len(original) <= compactImageSkipBytes {
+		t.Fatalf("test poster is %d bytes, want a source above the compact threshold", len(original))
+	}
+	if err := os.WriteFile(src, original, 0o644); err != nil {
+		t.Fatalf("write source: %v", err)
+	}
+	proxy := &ImageProxy{cacheDir: dir + string(os.PathSeparator) + "cache"}
+	var releases []func()
+	for i := 0; i < imageResizeConcurrency(); i++ {
+		release, ok := proxy.acquireResizeSlot(context.Background())
+		if !ok {
+			t.Fatal("expected a resize slot")
+		}
+		releases = append(releases, release)
+	}
+	go func() {
+		time.Sleep(40 * time.Millisecond)
+		releases[0]()
+	}()
+
+	rec := httptest.NewRecorder()
+	if !proxy.serveResizedFromFile(rec, httptest.NewRequest("GET", "/x?maxWidth=480&maxHeight=600", nil), src, imageResizeOptions{MaxWidth: 480, MaxHeight: 600}) {
+		t.Fatal("expected the request to wait for the slot and serve a thumbnail")
+	}
+	body := rec.Body.Bytes()
+	if bytes.Equal(body, original) {
+		t.Fatal("served the multi-hundred-KB PNG original instead of a re-encoded thumbnail")
+	}
+	if rec.Header().Get("Content-Type") != "image/jpeg" {
+		t.Fatalf("content type = %q, want image/jpeg", rec.Header().Get("Content-Type"))
+	}
+	// 同一请求第二次必须直接命中缩放缓存。
+	rec2 := httptest.NewRecorder()
+	if !proxy.serveResizedFromFile(rec2, httptest.NewRequest("GET", "/x?maxWidth=480&maxHeight=600", nil), src, imageResizeOptions{MaxWidth: 480, MaxHeight: 600}) {
+		t.Fatal("expected the cached thumbnail to be reused")
+	}
+	if !bytes.Equal(rec2.Body.Bytes(), body) {
+		t.Fatal("expected the cached thumbnail bytes to be identical")
 	}
 }
@@ -41,15 +41,6 @@ const (
 	introDBMaxRetryDelay = 3 * time.Second
 )

-// IntroDBSpan is one resolved skip range, still in provider terms.
-// EndMs == 0 means "runs to the end of the media" (TheIntroDB returns
-// end_ms: null for end credits); the caller resolves it against the duration.
-type IntroDBSpan struct {
-	Kind    string
-	StartMs int64
-	EndMs   int64
-}
-
 // IntroDBService queries TheIntroDB for one media item.
 type IntroDBService struct {
 	log        *zap.Logger
@@ -113,7 +104,7 @@ type introDBResponse struct {
 // 429/503 会重试一次（社区库在短时间连发下确实会限流）。重试前会先确认调用方
 // 的 deadline 还够用；预算不够就直接返回错误，让调用方保留自己的缓存，
 // 把「拿不到片段」维持在「少一个跳过按钮」的量级。
-func (s *IntroDBService) Fetch(ctx context.Context, tmdbID, season, episode int) ([]IntroDBSpan, error) {
+func (s *IntroDBService) Fetch(ctx context.Context, tmdbID, season, episode int) ([]SegmentSpan, error) {
 	if s == nil || s.client == nil {
 		return nil, errors.New("introdb service nil")
 	}
@@ -135,9 +126,20 @@ func (s *IntroDBService) Fetch(ctx context.Context, tmdbID, season, episode int)
 	}
 }

+// Source implements SegmentProvider.
+func (s *IntroDBService) Source() string { return IntroDBSource }
+
+// FetchSegments implements SegmentProvider. TheIntroDB 以 TMDb id 寻址。
+func (s *IntroDBService) FetchSegments(ctx context.Context, q SegmentQuery) ([]SegmentSpan, error) {
+	if q.IsMovie {
+		return s.Fetch(ctx, q.TMDbID, 0, 0)
+	}
+	return s.Fetch(ctx, q.TMDbID, q.Season, q.Episode)
+}
+
 // introDBFetchAttempt 是一次请求的结果：数据或错误，外加「值不值得重试」。
 type introDBFetchAttempt struct {
-	spans      []IntroDBSpan
+	spans      []SegmentSpan
 	err        error
 	retryable  bool
 	retryAfter time.Duration
@@ -246,7 +248,7 @@ func (s *IntroDBService) mediaURL(tmdbID, season, episode int) string {
 // parseIntroDBResponse flattens the per-type arrays into spans, preserving the
 // intro -> recap -> credits -> preview order so the player sees the earliest
 // range first.
-func parseIntroDBResponse(body []byte) ([]IntroDBSpan, error) {
+func parseIntroDBResponse(body []byte) ([]SegmentSpan, error) {
 	var raw introDBResponse
 	if err := json.Unmarshal(body, &raw); err != nil {
 		return nil, fmt.Errorf("parse introdb json: %w", err)
@@ -260,7 +262,7 @@ func parseIntroDBResponse(body []byte) ([]IntroDBSpan, error) {
 		{"credits", raw.Credits},
 		{"preview", raw.Preview},
 	}
-	spans := make([]IntroDBSpan, 0, len(raw.Intro)+len(raw.Credits))
+	spans := make([]SegmentSpan, 0, len(raw.Intro)+len(raw.Credits))
 	for _, group := range groups {
 		for _, r := range group.ranges {
 			var start int64
@@ -274,12 +276,24 @@ func parseIntroDBResponse(body []byte) ([]IntroDBSpan, error) {
 			if start < 0 {
 				start = 0
 			}
-			// end == 0 表示「延续到片尾」，是合法值；其余情况 end 必须大于 start，
-			// 否则这段区间没有任何可跳过的内容，直接丢弃避免在播放器里出现空按钮。
-			if end != 0 && end <= start {
+			// 官方规范（theintrodb.org/openapi.yaml，SegmentTimestamp）区分了两种
+			// 「没有数值」的写法，含义完全不同，必须按指针区分而不能都归零：
+			//   end_ms: null —— Credits/Preview 专用，「一直到片尾」，合法，
+			//                   落成 0 作为哨兵值由客户端结合片长补齐；
+			//   end_ms: 0    —— 「no segment」，即这一段不存在。
+			// 早期实现把两者都当成「到片尾」，于是 intro:[{start_ms:null,end_ms:0}]
+			// 被解释成 [0, 片长]，整集都落在「片头」区间里：一开播就弹跳过按钮，
+			// 开了自动跳过更是直接跳到片尾。实测约三分之一的剧集会返回这种占位。
+			if r.EndMs != nil && end <= start {
 				continue
 			}
-			spans = append(spans, IntroDBSpan{Kind: group.kind, StartMs: start, EndMs: end})
+			// 只有片尾类区间才允许「开放结束点」（end_ms: null 落成 0）。片头/回顾
+			// 如果出现 null 结束点，补齐后的区间会覆盖到片尾，等于把整集判成片头，
+			// 所以宁可不显示也不猜。
+			if r.EndMs == nil && group.kind != "credits" && group.kind != "preview" {
+				continue
+			}
+			spans = append(spans, SegmentSpan{Kind: group.kind, StartMs: start, EndMs: end})
 		}
 	}
 	return spans, nil
@@ -0,0 +1,160 @@
+// Package service — IntroDB (https://introdb.app) segment client.
+//
+// 与 TheIntroDB 是两家不同的社区库：IntroDB 只接受 IMDb id 定位媒体，
+// 用 is_movie 区分电影与剧集，响应把每种区间直接给成 {start_ms,end_ms} 对象
+// （而不是按类型分数组），片尾字段名是 outro 而不是 credits，
+// 另外还有 post_credits（片尾彩蛋，映射为预告/额外片尾）。
+package service
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"go.uber.org/zap"
+)
+
+// IntroDBAppBaseURL 是公开只读端点。POST /submit 需要 API key，这里不做写入。
+const IntroDBAppBaseURL = "https://api.introdb.app"
+
+// IntroDBAppSource 写入 media_segments.source，与 TheIntroDB 的 "theintrodb" 区分。
+const IntroDBAppSource = "introdb"
+
+const (
+	introDBAppTimeout     = 8 * time.Second
+	introDBAppMaxBodySize = 1 << 20
+)
+
+// introDBAppSegment 是 IntroDB 的单个区间对象。null 表示该类型没有数据。
+type introDBAppSegment struct {
+	StartMs *int64 `json:"start_ms"`
+	EndMs   *int64 `json:"end_ms"`
+}
+
+// introDBAppResponse 对应 GET /segments。
+type introDBAppResponse struct {
+	IMDbID      string             `json:"imdb_id"`
+	MediaType   string             `json:"media_type"`
+	IsMovie     bool               `json:"is_movie"`
+	Season      int                `json:"season"`
+	Episode     int                `json:"episode"`
+	Intro       *introDBAppSegment `json:"intro"`
+	Recap       *introDBAppSegment `json:"recap"`
+	Outro       *introDBAppSegment `json:"outro"`
+	PostCredits *introDBAppSegment `json:"post_credits"`
+}
+
+// IntroDBAppService 查询 IntroDB 的片段数据。
+type IntroDBAppService struct {
+	log     *zap.Logger
+	client  *http.Client
+	baseURL string
+}
+
+// NewIntroDBAppService is the constructor. The client honours environment and
+// OS proxy settings so it behaves like the other third-party API clients.
+func NewIntroDBAppService(log *zap.Logger) *IntroDBAppService {
+	return &IntroDBAppService{
+		log:     log,
+		client:  NewExternalHTTPClient(introDBAppTimeout),
+		baseURL: IntroDBAppBaseURL,
+	}
+}
+
+// SetBaseURL overrides the API root (tests, mirrors).
+func (s *IntroDBAppService) SetBaseURL(base string) *IntroDBAppService {
+	if s != nil && strings.TrimSpace(base) != "" {
+		s.baseURL = strings.TrimRight(strings.TrimSpace(base), "/")
+	}
+	return s
+}
+
+// Source implements SegmentProvider.
+func (s *IntroDBAppService) Source() string { return IntroDBAppSource }
+
+// FetchSegments implements SegmentProvider.
+//
+// 没有 IMDb id 时直接返回空：IntroDB 不接受 TMDb id，用别的 id 拼请求只会拿到
+// 400，那会被误记成「查询失败」从而保留旧缓存、永远不再刷新。
+func (s *IntroDBAppService) FetchSegments(ctx context.Context, q SegmentQuery) ([]SegmentSpan, error) {
+	if s == nil || s.client == nil || strings.TrimSpace(q.IMDbID) == "" {
+		return nil, nil
+	}
+	endpoint := s.segmentsURL(q)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Accept", "application/json")
+	resp, err := s.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer func() { _ = resp.Body.Close() }()
+
+	// 404 = 库里没有这部片，是正常的「无数据」，不是错误。
+	if resp.StatusCode == http.StatusNotFound {
+		return nil, nil
+	}
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return nil, fmt.Errorf("introdb: unexpected status %d", resp.StatusCode)
+	}
+	body, err := io.ReadAll(io.LimitReader(resp.Body, introDBAppMaxBodySize))
+	if err != nil {
+		return nil, err
+	}
+	return parseIntroDBAppResponse(body)
+}
+
+func (s *IntroDBAppService) segmentsURL(q SegmentQuery) string {
+	values := url.Values{}
+	values.Set("imdb_id", strings.TrimSpace(q.IMDbID))
+	if q.IsMovie {
+		values.Set("is_movie", "true")
+	} else if q.Season > 0 && q.Episode > 0 {
+		values.Set("season", strconv.Itoa(q.Season))
+		values.Set("episode", strconv.Itoa(q.Episode))
+	}
+	return s.baseURL + "/segments?" + values.Encode()
+}
+
+// parseIntroDBAppResponse 把 IntroDB 的四个区间对象摊平成 spans。
+//
+// 顺序固定为 intro -> recap -> outro -> post_credits，与 TheIntroDB 的
+// intro/recap/credits/preview 对齐，后处理逻辑因此可以对来源无感。
+func parseIntroDBAppResponse(body []byte) ([]SegmentSpan, error) {
+	var raw introDBAppResponse
+	if err := json.Unmarshal(body, &raw); err != nil {
+		return nil, fmt.Errorf("parse introdb json: %w", err)
+	}
+	groups := []struct {
+		kind string
+		seg  *introDBAppSegment
+	}{
+		{"intro", raw.Intro},
+		{"recap", raw.Recap},
+		{"credits", raw.Outro},
+		{"preview", raw.PostCredits},
+	}
+	spans := make([]SegmentSpan, 0, len(groups))
+	for _, group := range groups {
+		if group.seg == nil || group.seg.StartMs == nil || group.seg.EndMs == nil {
+			continue
+		}
+		start, end := *group.seg.StartMs, *group.seg.EndMs
+		if start < 0 {
+			start = 0
+		}
+		if end <= start {
+			continue
+		}
+		spans = append(spans, SegmentSpan{Kind: group.kind, StartMs: start, EndMs: end})
+	}
+	return spans, nil
+}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
truewhile	08d521b65d	Merge changes from prometheus/mebox-40a7378b	2026-11-12 22:38:54 +08:00
truewhile	5806839601	Merge changes from prometheus/mebox-40a7378b	2026-11-12 22:13:57 +08:00
truewhile	d7c150ffd9	优化	2026-11-12 18:58:45 +08:00
truewhile	79943d9067	优化	2026-11-05 17:03:26 +08:00
truewhile	9ffac320c4	优化	2026-11-04 10:16:12 +08:00
truewhile	9b8ca33279	bug处理	2026-11-01 09:23:58 +08:00
truewhile	34e61a5994	优化	2026-10-31 12:48:50 +08:00
truewhile	d91ded9d55	优化	2026-10-30 18:54:26 +08:00
truewhile	8458b8060a	优化	2026-10-30 10:45:59 +08:00
truewhile	623d87f12b	优化	2026-10-29 23:47:18 +08:00
truewhile	d820214abc	优化	2026-10-29 22:52:39 +08:00
truewhile	0ab4693b92	优化	2026-10-29 22:11:28 +08:00
truewhile	db516ded61	优化	2026-10-29 00:09:00 +08:00
truewhile	416d4c8c3b	优化	2026-10-27 22:14:40 +08:00
truewhile	78cfe0aba2	优化	2026-10-24 13:51:25 +08:00
truewhile	60ed34d5b1	优化	2026-10-24 00:22:10 +08:00
truewhile	31e775b9ba	优化	2026-10-24 00:12:20 +08:00
truewhile	bf35bd3d02	优化	2026-10-23 23:11:05 +08:00
truewhile	0a84031d06	fix(player): 方向键不再唤出控制栏，仅续期隐藏计时器方向键调整进度/音量时，若控制栏隐藏则保持隐藏，若可见则只刷新自动隐藏计时器，避免连续按键中途消失。	2026-10-22 17:11:02 +08:00
truewhile	9ccf60427a	优化	2026-10-22 15:14:00 +08:00
truewhile	54b0e33968	优化	2026-10-22 00:44:37 +08:00
truewhile	74487359bf	优	2026-10-21 13:21:13 +08:00
truewhile	55854a0adb	优化播放逻辑	2026-10-21 12:02:11 +08:00
truewhile	121a0a3cc5	优化	2026-10-21 10:11:47 +08:00
truewhile	3057664a48	优化	2026-10-21 09:19:14 +08:00
truewhile	7793d50906	优化	2026-10-21 00:06:16 +08:00
truewhile	5ad71b9421	优化查询	2026-10-20 23:29:51 +08:00
truewhile	5615806c2c	Merge pull request #49 from truewhile/feat/media-maintenance-and-diagnostics 完善媒体维护、备份恢复与播放诊断	2026-10-20 22:04:10 +08:00
jason jia	1e8fe2396e	feat: 完善媒体维护、备份恢复与播放诊断	2026-10-20 14:01:42 +00:00