Merge changes from prometheus/mebox-40a7378b

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。

.github/workflows/ci.yml

@@ -40,6 +40,39 @@ jobs:
       - name: go test
         run: go test ./...
 
+  database-compatibility:
+    name: SQLite / PostgreSQL ${{ matrix.postgres }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        postgres: [16, 17]
+    services:
+      postgres:
+        image: postgres:${{ matrix.postgres }}-alpine
+        env:
+          POSTGRES_USER: mebox
+          POSTGRES_PASSWORD: mebox-test-only
+          POSTGRES_DB: mebox_test
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd "pg_isready -U mebox -d mebox_test"
+          --health-interval 5s
+          --health-timeout 5s
+          --health-retries 10
+    env:
+      MEBOX_TEST_POSTGRES_DSN: postgres://mebox:mebox-test-only@127.0.0.1:5432/mebox_test?sslmode=disable
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.26'
+          cache: true
+
+      - name: Database regression tests
+        run: go test ./internal/database ./internal/repository -count=1
+
   frontend:
     name: Frontend (Node)
     runs-on: ubuntu-latest
@@ -78,7 +111,7 @@ jobs:
   ci-success:
     name: CI Success
     runs-on: ubuntu-latest
-    needs: [backend, frontend, smoke]
+    needs: [backend, frontend, database-compatibility, smoke]
     if: success()
     steps:
       - run: echo "CI passed, ready for release"

CONTRIBUTING.md

@@ -84,6 +84,15 @@ go test ./internal/service -run "TestOrganize|TestSubscription|TestMTeam" -count
 go test ./cmd/server -count=1
 ```
 
+数据库兼容测试默认覆盖 SQLite。连接专用测试 PostgreSQL 后可运行真实的双数据库回归：
+
+```bash
+MEBOX_TEST_POSTGRES_DSN='postgres://mebox:test-password@127.0.0.1:5432/mebox_test?sslmode=disable' \
+  go test ./internal/database ./internal/repository -count=1
+```
+
+测试账号需要创建、删除 schema 的权限；每个用例使用独立的临时 schema。CI 会分别在 PostgreSQL 16、17 上执行这些检查。
+
 ### 代码要求
 
 - Go 代码使用 `gofmt`。

cmd/server/application.go

@@ -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))
 	}

cmd/server/server_manager.go

@@ -355,6 +355,9 @@ func (m *serverManager) drain(s *http.Server) {
 	if s == nil {
 		return
 	}
+	// Stop reusing old connections before Reload returns. Asynchronous Shutdown
+	// alone leaves a window where a client receives the previous HTTP/TLS mode.
+	s.SetKeepAlivesEnabled(false)
 	go func(s *http.Server) {
 		ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
 		defer cancel()

docs/cloud-download-plan.md

@@ -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` |

docs/mobile-api/deployment.md

@@ -0,0 +1,91 @@
+# MeBox Mobile API 接入与部署说明
+
+更新日期：2026-10-17  
+适用版本：后端 `feature/android-mobile-api` 分支；App `0.1.0`（versionCode 1）。
+
+## 1. 路径与版本
+
+- 安卓契约挂载在 `/api/v1`，与既有 `/api`、Emby/Jellyfin 入口并行。
+- 健康检查：`GET /api/health`。
+- 实例身份：`GET /api/v1/server-info`（匿名，`Cache-Control: no-store`）。
+- 契约字段与错误码见同目录 `openapi.yaml`。
+
+`server-info.capabilities` 必须反映真实运行能力。当前分支只有
+`device_sessions=true`；播放会话、阅读 v1 进度、批量正文与移动端转码仍为
+`false`，App 不得据此进入对应流程。
+
+## 2. 连接与传输安全
+
+- 公网必须使用 HTTPS；App 默认使用系统信任链，不提供全局跳过证书校验。
+- 局域网 HTTP 需要用户在 App 内明确确认风险；App 只对当前配置的服务器来源
+  使用明文，不会把 MeBox `Authorization` 发往其它主机。
+- 首版只支持根路径部署。`https://host/mebox` 这类子路径会被 App 明确拒绝，
+  不会静默截断为根路径。
+- 反代需要保留 `X-Request-ID`（可选）；服务端会回传同值或新生成值，用于
+  日志对账。
+
+## 3. 反向代理检查项
+
+以下项用于媒体阶段（M3/M4）回归，当前登录闭环不依赖它们，但仍建议提前配置：
+
+| 项目 | 要求 |
+| --- | --- |
+| Range / 206 | 透传客户端 `Range`，不要缓存完整响应后改写状态码 |
+| 流式响应 | 关闭代理缓冲（如 nginx `proxy_buffering off`） |
+| HLS | `.m3u8` 与分片路径不要被改写或强制压缩 |
+| WebSocket | 升级头透传，读超时大于心跳间隔 |
+| 超时 | 登录/普通 API 30 秒内完成；转码起播超时单独配置 |
+
+目前只验证了普通 JSON 端点；上表其余项尚未在本分支验收。
+
+## 4. 认证与会话
+
+- `POST /api/v1/auth/login` 创建 `auth_sessions` 记录，访问令牌 JWT 增加 `sid`。
+- 旧 `/api` 中间件同样校验 `sid`：设备被踢出或退出后，未过期的 JWT 也会立即
+  返回 401，不能借旧入口绕过。
+- 没有 `sid` 的历史令牌继续按原逻辑访问旧 API；v1 认证端点拒绝这类令牌，
+  App 需要重新登录。
+- `POST /api/v1/auth/logout` 幂等；会话撤销会同时撤销其名下刷新令牌。
+- 设备管理中的踢出操作会同步撤销该设备认证会话。
+
+### 刷新轮换边界
+
+- 同一个刷新令牌的并发请求共享一次轮换；60 秒宽限期内重复提交返回同一结果。
+- 轮换结果仍保存在进程内。若新令牌已签发、旧令牌已撤销，但客户端没收到响应
+  且服务器随后重启，旧令牌可能无法恢复；此时 App 应要求重新登录。首版接受
+  该边界，未实现持久化幂等轮换。
+- 会话被撤销时，刷新返回 `401 SESSION_REVOKED`，优先于宽限期复用。
+
+## 5. 错误契约
+
+统一响应：
+
+```json
+{
+  "code": "SESSION_REVOKED",
+  "message": "auth session revoked or expired",
+  "request_id": "8a3bade4-cbb3-485b-8e34-2471e4940fc3",
+  "retryable": false
+}
+```
+
+- 401 由 `code` 区分 `TOKEN_EXPIRED`、`SESSION_REVOKED`、`INVALID_CREDENTIALS`。
+- 403 表示权限或账号状态，不触发刷新。
+- 429 带 `Retry-After`，客户端必须等待。
+- 5xx / `SERVICE_UNAVAILABLE` / `retryable=true` 表示可安全重试。
+
+## 6. 数据迁移与回滚
+
+- 新表 `auth_sessions` 与 `refresh_tokens.auth_session_id` 由现有 AutoMigrate
+  创建，属于增量变更，不清库。
+- SQLite 已验证；PostgreSQL 迁移需要在有实例的环境中单独执行
+  `go test ./internal/database ./internal/repository -count=1` 后才能宣称通过。
+- 回滚到旧版本不会删除新表；旧程序忽略新增字段。回滚前应先确认不需要再
+  依赖 `sid` 即时撤销能力。
+
+## 7. 已知限制
+
+- 单实例部署；未实现多副本共享会话。
+- 外部播放令牌尚未继承 `sid`（属于 M3 播放会话范围），当前不能按设备即时撤销。
+- 反代子路径、自签名证书信任、多服务器配置均未支持。
+- App 目前只开放连接、登录、会话恢复与退出；媒体与阅读入口未实现。

docs/mobile-api/openapi.yaml

@@ -0,0 +1,389 @@
+openapi: 3.0.3
+info:
+  title: MeBox Mobile API
+  version: 1.0.0
+  description: |
+    MeBox 安卓客户端的稳定接入契约。所有路径以 `/api` 为前缀挂载，
+    本文档描述 `/api/v1` 部分；既有 `/api` 与 Emby/Jellyfin 入口保持兼容。
+
+    约定：
+    - JSON 字段使用 snake_case；
+    - 时间点为 RFC 3339 UTC 字符串，播放位置与时长使用整数毫秒；
+    - 集合为空时返回 `[]`，未知字段客户端必须忽略；
+    - 错误响应统一为 `code`、`message`、`request_id`、`retryable`；
+    - 能力开关只有在接口实现且当前可运行时才为 true。
+servers:
+  - url: /api
+security:
+  - bearerAuth: []
+tags:
+  - name: server
+  - name: auth
+paths:
+  /v1/server-info:
+    get:
+      tags: [server]
+      summary: 匿名读取实例身份与移动端能力
+      security: []
+      responses:
+        '200':
+          description: 实例可连接
+          headers:
+            Cache-Control:
+              schema:
+                type: string
+              description: 固定为 no-store
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ServerInfo'
+        '503':
+          description: 暂时无法读取实例身份
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/MobileError'
+  /v1/auth/login:
+    post:
+      tags: [auth]
+      summary: 账号密码登录并创建认证会话
+      security: []
+      parameters:
+        - $ref: '#/components/parameters/RequestId'
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/LoginRequest'
+      responses:
+        '200':
+          description: 登录成功
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/AuthResponse'
+        '400':
+          $ref: '#/components/responses/InvalidArgument'
+        '401':
+          $ref: '#/components/responses/InvalidCredentials'
+        '403':
+          description: 账号被禁用或已到期
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/MobileError'
+        '429':
+          $ref: '#/components/responses/RateLimited'
+        '503':
+          $ref: '#/components/responses/ServiceUnavailable'
+  /v1/auth/refresh:
+    post:
+      tags: [auth]
+      summary: 使用刷新令牌轮换令牌对
+      security: []
+      description: |
+        刷新令牌必须由 v1 登录签发并关联认证会话。同一 refresh token 的
+        并发提交只会真正轮换一次；轮换后 60 秒内重复提交返回同一次结果。
+        会话被撤销后刷新返回 SESSION_REVOKED。
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/RefreshRequest'
+      responses:
+        '200':
+          description: 刷新成功，新令牌继续归属同一 auth_session_id
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/AuthResponse'
+        '400':
+          $ref: '#/components/responses/InvalidArgument'
+        '401':
+          description: 刷新令牌无效、过期或会话已撤销
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/MobileError'
+        '503':
+          $ref: '#/components/responses/ServiceUnavailable'
+  /v1/auth/session:
+    get:
+      tags: [auth]
+      summary: 读取当前用户与认证会话
+      responses:
+        '200':
+          description: 会话有效
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SessionResponse'
+        '401':
+          $ref: '#/components/responses/SessionInvalid'
+        '503':
+          $ref: '#/components/responses/ServiceUnavailable'
+  /v1/auth/logout:
+    post:
+      tags: [auth]
+      summary: 撤销当前认证会话
+      description: 幂等；重复退出同样返回 200。
+      responses:
+        '200':
+          description: 已退出（本机与远端）
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  status:
+                    type: string
+                    example: ok
+        '401':
+          $ref: '#/components/responses/SessionInvalid'
+        '503':
+          $ref: '#/components/responses/ServiceUnavailable'
+components:
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
+  parameters:
+    RequestId:
+      name: X-Request-ID
+      in: header
+      required: false
+      description: |
+        可选的诊断 ID（8—128 位 ASCII 字母、数字或 `-_.:`）。服务器会在
+        响应头与错误体回传同一个值；非法值会被替换为新 UUID。该值不参与鉴权。
+      schema:
+        type: string
+  responses:
+    InvalidArgument:
+      description: 请求字段缺失或格式错误
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/MobileError'
+    InvalidCredentials:
+      description: 用户名或密码错误
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/MobileError'
+    SessionInvalid:
+      description: 访问令牌无效、过期或认证会话已撤销
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/MobileError'
+    RateLimited:
+      description: 请求过于频繁
+      headers:
+        Retry-After:
+          schema:
+            type: integer
+          description: 建议等待秒数
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/MobileError'
+    ServiceUnavailable:
+      description: 暂时性服务/存储错误，可安全重试
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/MobileError'
+  schemas:
+    ServerInfo:
+      type: object
+      required:
+        - name
+        - server_id
+        - server_version
+        - api_version
+        - min_supported_app_version_code
+        - capabilities
+      properties:
+        name:
+          type: string
+          example: MeBox
+        server_id:
+          type: string
+          format: uuid
+          description: 实例持久身份；备份克隆成独立实例时必须显式重置。
+        server_version:
+          type: string
+          example: MeBox-v0.1.16
+        api_version:
+          type: string
+          example: v1
+        min_supported_app_version_code:
+          type: integer
+          minimum: 1
+        capabilities:
+          $ref: '#/components/schemas/ServerCapabilities'
+    ServerCapabilities:
+      type: object
+      required:
+        - device_sessions
+        - playback_sessions
+        - reader_progress_v1
+        - reader_content_batch
+        - local_transcode
+      properties:
+        device_sessions:
+          type: boolean
+          description: M1 起为 true
+        playback_sessions:
+          type: boolean
+          description: 播放会话接口未实现前必须为 false
+        reader_progress_v1:
+          type: boolean
+          description: v1 阅读锚点/版本冲突未实现前必须为 false
+        reader_content_batch:
+          type: boolean
+          description: v1 批量正文与资源引用未实现前必须为 false
+        local_transcode:
+          type: boolean
+          description: 移动端可用的本地转码会话未实现前必须为 false
+    MobileUser:
+      type: object
+      required: [id, username, role, tier, is_active, force_password_reset]
+      properties:
+        id:
+          type: string
+        username:
+          type: string
+        nickname:
+          type: string
+        role:
+          type: string
+          enum: [admin, user]
+        tier:
+          type: string
+          example: free
+        is_active:
+          type: boolean
+        force_password_reset:
+          type: boolean
+        expires_at:
+          type: string
+          format: date-time
+          nullable: true
+    TokenPair:
+      type: object
+      required: [access_token, refresh_token, expires_in, token_type]
+      properties:
+        access_token:
+          type: string
+        refresh_token:
+          type: string
+        expires_in:
+          type: integer
+          description: 访问令牌有效秒数
+        token_type:
+          type: string
+          example: Bearer
+    LoginRequest:
+      type: object
+      required: [username, password, device_id]
+      properties:
+        username:
+          type: string
+        password:
+          type: string
+        device_id:
+          type: string
+          maxLength: 128
+          description: App 安装随机生成，不使用 IMEI/MAC 等硬件标识。
+        device_name:
+          type: string
+          maxLength: 128
+        client_name:
+          type: string
+          maxLength: 64
+          example: MeBox Android
+        client_version:
+          type: string
+          maxLength: 64
+    RefreshRequest:
+      type: object
+      required: [refresh_token]
+      properties:
+        refresh_token:
+          type: string
+    AuthResponse:
+      type: object
+      required: [auth_session_id, user, tokens]
+      properties:
+        auth_session_id:
+          type: string
+          format: uuid
+        user:
+          $ref: '#/components/schemas/MobileUser'
+        tokens:
+          $ref: '#/components/schemas/TokenPair'
+    SessionDevice:
+      type: object
+      properties:
+        device_id:
+          type: string
+        device_name:
+          type: string
+        client_name:
+          type: string
+        client_version:
+          type: string
+        last_used_at:
+          type: string
+          format: date-time
+        expires_at:
+          type: string
+          format: date-time
+    SessionResponse:
+      type: object
+      required: [auth_session_id, user]
+      properties:
+        auth_session_id:
+          type: string
+          format: uuid
+        user:
+          $ref: '#/components/schemas/MobileUser'
+        session:
+          $ref: '#/components/schemas/SessionDevice'
+    MobileError:
+      type: object
+      required: [code, message, request_id, retryable]
+      properties:
+        code:
+          type: string
+          enum:
+            - INVALID_ARGUMENT
+            - INVALID_CREDENTIALS
+            - TOKEN_EXPIRED
+            - SESSION_REVOKED
+            - ACCOUNT_DISABLED
+            - ACCOUNT_EXPIRED
+            - PERMISSION_DENIED
+            - PROFILE_PIN_REQUIRED
+            - RATE_LIMITED
+            - UPSTREAM_UNAVAILABLE
+            - TRANSCODE_BUSY
+            - PLAYBACK_SESSION_NOT_FOUND
+            - RESOURCE_EXPIRED
+            - PROGRESS_CONFLICT
+            - SERVICE_UNAVAILABLE
+        message:
+          type: string
+        request_id:
+          type: string
+        retryable:
+          type: boolean
+        retry_after_sec:
+          type: integer
+          minimum: 0
+        details:
+          description: 可选的稳定结构化细节，未定义时客户端必须忽略。

docs/superpowers/plans/2026-10-21-playback-correctness-isolation.md

@@ -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.

internal/config/defaults.go

@@ -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)

internal/config/normalize.go

@@ -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
 	}

internal/config/types.go

@@ -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"`

internal/database/compatibility_test.go

@@ -0,0 +1,238 @@
+package database
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/stdlib"
+	"gorm.io/driver/postgres"
+	"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"
+)
+
+// PostgreSQL tests use a disposable schema, never the caller's existing tables.
+// Set MEBOX_TEST_POSTGRES_DSN to include a real PostgreSQL server in local runs.
+func compatibilityDB(t *testing.T, dialect string) *gorm.DB {
+	t.Helper()
+	var db *gorm.DB
+	if dialect == "sqlite" {
+		cfg := &config.Config{}
+		cfg.Database.Type = dialect
+		cfg.Database.DBPath = filepath.Join(t.TempDir(), "test.db")
+		cfg.Database.WALMode = true
+		cfg.Database.BusyTimeout = 5000
+		cfg.Database.MaxOpenConns = 8
+		var err error
+		db, err = Open(cfg, nil)
+		if err != nil {
+			t.Fatal(err)
+		}
+	} else {
+		dsn := os.Getenv("MEBOX_TEST_POSTGRES_DSN")
+		if dsn == "" {
+			t.Skip("set MEBOX_TEST_POSTGRES_DSN to run PostgreSQL integration tests")
+		}
+		pgcfg, err := pgx.ParseConfig(dsn)
+		if err != nil {
+			t.Fatal("invalid PostgreSQL test configuration")
+		}
+		admin := stdlib.OpenDB(*pgcfg)
+		t.Cleanup(func() { _ = admin.Close() })
+		schemaName := "mebox_test_" + strings.ReplaceAll(uuid.NewString(), "-", "")
+		if _, err := admin.Exec("CREATE SCHEMA " + quoteIdent(schemaName)); err != nil {
+			t.Fatal(err)
+		}
+		t.Cleanup(func() {
+			if _, err := admin.Exec("DROP SCHEMA " + quoteIdent(schemaName) + " CASCADE"); err != nil {
+				t.Error(err)
+			}
+		})
+		pgcfg.RuntimeParams["search_path"] = schemaName + ",public"
+		conn := stdlib.OpenDB(*pgcfg)
+		t.Cleanup(func() { _ = conn.Close() })
+		db, err = gorm.Open(postgres.New(postgres.Config{Conn: conn}), &gorm.Config{})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	db.Logger = logger.Default.LogMode(logger.Silent)
+	if conn, err := db.DB(); err == nil {
+		t.Cleanup(func() { _ = conn.Close() })
+	}
+	if err := AutoMigrate(db); err != nil {
+		t.Fatal(err)
+	}
+	return db
+}
+
+func TestDatabaseCompatibility(t *testing.T) {
+	for _, dialect := range []string{"sqlite", "postgres"} {
+		t.Run(dialect, func(t *testing.T) {
+			t.Run("long_paths_and_restart", func(t *testing.T) {
+				db := compatibilityDB(t, dialect)
+				// Distinct CJK characters prevent TOAST compression from hiding
+				// the PostgreSQL btree entry size limit (> 2704 bytes).
+				var path strings.Builder
+				path.WriteString("/media/")
+				for i := range 980 {
+					path.WriteRune(rune(0x4e00 + i))
+				}
+				path.WriteString(".mkv")
+				media := model.Media{Path: path.String(), Title: "Long path"}
+				if err := db.Create(&media).Error; err != nil {
+					t.Fatalf("insert long media path: %v", err)
+				}
+				if err := db.Create(&model.Media{Path: media.Path}).Error; err == nil {
+					t.Fatal("duplicate path accepted")
+				}
+				if err := AutoMigrate(db); err != nil {
+					t.Fatalf("migrate existing database: %v", err)
+				}
+				var found model.Media
+				if err := db.Where("path = ?", media.Path).First(&found).Error; err != nil {
+					t.Fatalf("lookup long path: %v", err)
+				}
+			})
+			if dialect == "postgres" {
+				t.Run("upgrade_legacy_path_indexes", func(t *testing.T) {
+					db := compatibilityDB(t, dialect)
+					for _, unique := range []string{"UNIQUE ", ""} {
+						if err := db.Exec("DROP INDEX idx_media_path").Error; err != nil {
+							t.Fatal(err)
+						}
+						if err := db.Exec("CREATE " + unique + "INDEX idx_media_path ON media(path)").Error; err != nil {
+							t.Fatal(err)
+						}
+						for range 2 {
+							if err := ensureMediaPathIndex(db); err != nil {
+								t.Fatal(err)
+							}
+						}
+						isUnique, method, found, err := postgresIndexProperties(db, "idx_media_path")
+						if err != nil || !found || isUnique || method != "hash" {
+							t.Fatalf("legacy index not upgraded: unique=%v method=%s found=%v err=%v", isUnique, method, found, err)
+						}
+					}
+				})
+			}
+			t.Run("search_ranking", func(t *testing.T) {
+				db := compatibilityDB(t, dialect)
+				// Exercise LIKE fallback in both engines.
+				if dialect == "sqlite" {
+					resetMediaSearchIndex(db)
+				}
+				for i, title := range []string{"The Alpha story", "Alpha sequel", "Alpha"} {
+					row := model.Media{Base: model.Base{ID: fmt.Sprintf("m-%d", i), CreatedAt: time.Now().Add(time.Duration(i) * time.Minute)}, Title: title, Path: fmt.Sprintf("/media/%d.mkv", i)}
+					if err := db.Create(&row).Error; err != nil {
+						t.Fatal(err)
+					}
+				}
+				items, total, err := repository.New(db).Media.SearchFilteredPage(t.Context(), "Alpha", 0, 10, repository.MediaQueryFilter{IncludeNSFW: true})
+				if err != nil {
+					t.Fatal(err)
+				}
+				if total != 3 || len(items) != 3 || items[0].Title != "Alpha" || items[1].Title != "Alpha sequel" {
+					t.Fatalf("unexpected search ranking: total=%d, items=%v", total, items)
+				}
+			})
+			t.Run("concurrent_media_upsert", func(t *testing.T) {
+				db := compatibilityDB(t, dialect)
+				repo := repository.New(db).Media
+				const workers = 8
+				// Synchronize the initial lookups to force the insert race.
+				var lookups sync.WaitGroup
+				lookups.Add(workers)
+				if dialect == "postgres" {
+					if err := db.Callback().Query().After("gorm:after_query").Register("test:insert_race", func(tx *gorm.DB) {
+						if tx.Statement.Table == "media" && tx.Error == gorm.ErrRecordNotFound {
+							lookups.Done()
+							lookups.Wait()
+						}
+					}); err != nil {
+						t.Fatal(err)
+					}
+				}
+				ctx, cancel := context.WithTimeout(t.Context(), 15*time.Second)
+				defer cancel()
+				errs := make(chan error, workers)
+				for range workers {
+					go func() { errs <- repo.Upsert(ctx, &model.Media{Path: "/media/shared.mkv", Title: "Shared"}) }()
+				}
+				for range workers {
+					if err := <-errs; err != nil {
+						t.Errorf("concurrent upsert: %v", err)
+					}
+				}
+				var count int64
+				if err := db.Model(&model.Media{}).Count(&count).Error; err != nil || count != 1 {
+					t.Fatalf("media count=%d, err=%v", count, err)
+				}
+			})
+			t.Run("search_filters", func(t *testing.T) {
+				db := compatibilityDB(t, dialect)
+				rows := []model.Media{
+					{Base: model.Base{ID: "keep"}, LibraryID: "lib-1", Genres: "Action", Year: 2020, Rating: 8},
+					{Base: model.Base{ID: "other-library"}, LibraryID: "lib-2", Genres: "Action", Year: 2020, Rating: 8},
+					{Base: model.Base{ID: "other-genre"}, LibraryID: "lib-1", Genres: "Comedy", Year: 2020, Rating: 8},
+					{Base: model.Base{ID: "too-old"}, LibraryID: "lib-1", Genres: "Action", Year: 1990, Rating: 8},
+					{Base: model.Base{ID: "too-new"}, LibraryID: "lib-1", Genres: "Action", Year: 2026, Rating: 8},
+					{Base: model.Base{ID: "low-rating"}, LibraryID: "lib-1", Genres: "Action", Year: 2020, Rating: 2},
+					{Base: model.Base{ID: "watched"}, LibraryID: "lib-1", Genres: "Action", Year: 2020, Rating: 8},
+				}
+				for i := range rows {
+					rows[i].Title = "Alpha " + rows[i].ID
+					rows[i].Path = "/media/" + rows[i].ID + ".mkv"
+					if err := db.Create(&rows[i]).Error; err != nil {
+						t.Fatal(err)
+					}
+				}
+				if err := db.Create(&model.PlaybackHistory{UserID: "viewer", MediaID: "watched", Completed: true}).Error; err != nil {
+					t.Fatal(err)
+				}
+				items, total, err := repository.New(db).Media.SearchFilteredPage(t.Context(), "alpha", 0, 10, repository.MediaQueryFilter{
+					IncludeNSFW: true, LibraryID: "lib-1", Genres: []string{"Action"}, YearMin: 2000, YearMax: 2025, RatingMin: 5,
+					UnwatchedOnly: true, UnwatchedUserID: "viewer",
+				})
+				if err != nil {
+					t.Fatal(err)
+				}
+				if total != 1 || len(items) != 1 || items[0].ID != "keep" {
+					t.Fatalf("search ignored filters: total=%d, items=%v", total, items)
+				}
+			})
+			t.Run("migration_preserves_zero_values", func(t *testing.T) {
+				src := compatibilityDB(t, "sqlite")
+				dst := compatibilityDB(t, dialect)
+				user := model.User{Username: "disabled", PasswordHash: "hash"}
+				if err := src.Create(&user).Error; err != nil {
+					t.Fatal(err)
+				}
+				if err := src.Model(&user).Updates(map[string]any{"is_active": false, "hide_adult": false, "player_volume": 0, "danmaku_enabled": false}).Error; err != nil {
+					t.Fatal(err)
+				}
+				if _, _, err := copyModelTables(src, dst, 500); err != nil {
+					t.Fatal(err)
+				}
+				var got model.User
+				if err := dst.First(&got, "id = ?", user.ID).Error; err != nil {
+					t.Fatal(err)
+				}
+				if got.IsActive || got.HideAdult || got.PlayerVolume != 0 || got.DanmakuEnabled {
+					t.Fatalf("migration replaced stored zero values: active=%v hide_adult=%v volume=%v danmaku=%v", got.IsActive, got.HideAdult, got.PlayerVolume, got.DanmakuEnabled)
+				}
+			})
+		})
+	}
+}

internal/database/persisted_rows.go

@@ -0,0 +1,50 @@
+package database
+
+import (
+	"fmt"
+	"reflect"
+
+	"gorm.io/gorm"
+)
+
+// InsertPreservingValues copies persisted model rows without applying creation
+// hooks or defaults. Struct CreateInBatches treats false, 0 and empty strings as
+// missing values, which would reactivate disabled accounts during migration or
+// restore. Column maps preserve the exact values already stored in the source.
+func InsertPreservingValues(db *gorm.DB, rows any, batchSize int) error {
+	stmt := &gorm.Statement{DB: db}
+	if err := stmt.Parse(rows); err != nil {
+		return err
+	}
+	slice := reflect.Indirect(reflect.ValueOf(rows))
+	if slice.Kind() != reflect.Slice {
+		return fmt.Errorf("persisted rows must be a slice, got %T", rows)
+	}
+	if len(stmt.Schema.DBNames) == 0 {
+		return fmt.Errorf("persisted rows have no database columns")
+	}
+	values := make([]map[string]any, 0, slice.Len())
+	for i := 0; i < slice.Len(); i++ {
+		row := make(map[string]any, len(stmt.Schema.DBNames))
+		for _, name := range stmt.Schema.DBNames {
+			field := stmt.Schema.FieldsByDBName[name]
+			if field.Creatable {
+				row[name], _ = field.ValueOf(db.Statement.Context, slice.Index(i))
+			}
+		}
+		values = append(values, row)
+	}
+	if len(values) == 0 {
+		return nil
+	}
+	// Bound batches by each engine's bind-parameter limit.
+	parameterLimit := 65535
+	if isSQLite(db) {
+		parameterLimit = 32766
+	}
+	maxBatch := parameterLimit / len(stmt.Schema.DBNames)
+	if batchSize <= 0 || batchSize > maxBatch {
+		batchSize = maxBatch
+	}
+	return db.Table(stmt.Schema.Table).CreateInBatches(values, batchSize).Error
+}

internal/database/schema_migration.go

@@ -71,8 +71,8 @@ func AutoMigrateWithConfig(db *gorm.DB, cfg *config.Config, log *zap.Logger) err
 //	index row size ... exceeds btree version 4 maximum 2704
 //
 // 所以 PostgreSQL 改用 md5(path) 的表达式唯一索引（定长 32 字节，永远塞得下），
-// 同时保留一条普通索引 idx_media_path 供 path = ? 等值查找（扫描与 upsert 的
-// 热路径）使用。SQLite 没有这个长度限制，沿用整列唯一索引。
+// 同时用 hash 索引 idx_media_path 加速 path = ? 等值查找；非唯一 btree
+// 也有索引项长度限制，不能继续对完整 path 建 btree。SQLite 沿用整列唯一索引。
 func ensureMediaPathIndex(db *gorm.DB) error {
 	if db == nil || !db.Migrator().HasTable("media") {
 		return nil
@@ -84,37 +84,39 @@ func ensureMediaPathIndex(db *gorm.DB) error {
 	if err := db.Exec(`CREATE UNIQUE INDEX IF NOT EXISTS idx_media_path_hash ON media(md5(path))`).Error; err != nil {
 		return err
 	}
-	unique, found, err := postgresIndexIsUnique(db, "idx_media_path")
+	unique, method, found, err := postgresIndexProperties(db, "idx_media_path")
 	if err != nil {
 		return err
 	}
-	if found && unique {
+	if found && (unique || method != "hash") {
 		if err := db.Exec(`DROP INDEX IF EXISTS idx_media_path`).Error; err != nil {
 			return err
 		}
 	}
-	return db.Exec(`CREATE INDEX IF NOT EXISTS idx_media_path ON media(path)`).Error
+	return db.Exec(`CREATE INDEX IF NOT EXISTS idx_media_path ON media USING hash(path)`).Error
 }
 
-// postgresIndexIsUnique 报告当前 schema 下是否存在该索引、以及它是否唯一。
-func postgresIndexIsUnique(db *gorm.DB, indexName string) (unique bool, found bool, err error) {
+// postgresIndexProperties 返回当前 schema 下索引的唯一性与访问方法。
+func postgresIndexProperties(db *gorm.DB, indexName string) (unique bool, method string, found bool, err error) {
 	// 用指针接 bool：没有匹配行时 Scan 不报错，nil 即代表索引不存在。
 	var row struct {
 		IsUnique *bool
+		Method   string
 	}
 	if err := db.Raw(`
-SELECT i.indisunique AS is_unique
+SELECT i.indisunique AS is_unique, a.amname AS method
 FROM pg_class c
 JOIN pg_index i ON i.indexrelid = c.oid
 JOIN pg_namespace n ON n.oid = c.relnamespace
+JOIN pg_am a ON a.oid = c.relam
 WHERE n.nspname = current_schema() AND c.relname = ?
 `, indexName).Scan(&row).Error; err != nil {
-		return false, false, err
+		return false, "", false, err
 	}
 	if row.IsUnique == nil {
-		return false, false, nil
+		return false, "", false, nil
 	}
-	return *row.IsUnique, true, nil
+	return *row.IsUnique, row.Method, true, nil
 }
 
 // ensurePostgresSearchIndexes 给 PostgreSQL 补上 SQLite FTS5 的替代品。
@@ -374,6 +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`,

internal/database/sqlite_migration_copy.go

@@ -78,7 +78,7 @@ func copyModelTables(src, target *gorm.DB, batchSize int) (map[string]int64, int
 			if filtered.Len() > 0 {
 				filteredPtr := reflect.New(filtered.Type())
 				filteredPtr.Elem().Set(filtered)
-				if err := target.Clauses(clause.OnConflict{DoNothing: true}).CreateInBatches(filteredPtr.Interface(), batchSize).Error; err != nil {
+				if err := InsertPreservingValues(target.Clauses(clause.OnConflict{DoNothing: true}), filteredPtr.Interface(), batchSize); err != nil {
 					return tableCounts, totalCopied, fmt.Errorf("copy sqlite table %s: %w", table, err)
 				}
 				copiedForTable += int64(filtered.Len())

internal/database/sqlite_restore.go

@@ -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
+}

internal/database/sqlite_restore_test.go

@@ -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)
+	}
+}

internal/database/sqlite_runtime.go

@@ -104,19 +104,18 @@ func (g *sqliteWriteGate) Lock(ctx context.Context) (*sqliteGateHolder, error) {
 	if ctx == nil {
 		ctx = context.Background()
 	}
-	// ctx 取消时唤醒等待者（cond 无法感知 ctx，用旁路 goroutine 广播）。
-	if done := ctx.Done(); done != nil {
-		stop := make(chan struct{})
-		defer close(stop)
-		go func() {
-			select {
-			case <-done:
-				g.cond.Broadcast()
-			case <-stop:
-			}
-		}()
+	// 广播也必须持有同一把锁，否则取消可能落在检查与 Wait 之间而丢失。
+	wake := func() {
+		g.mu.Lock()
+		defer g.mu.Unlock()
+		g.cond.Broadcast()
 	}
+	stopCancel := context.AfterFunc(ctx, wake)
+	defer stopCancel()
 	for {
+		if ctx.Err() != nil {
+			return nil, ctx.Err()
+		}
 		if g.owner == nil {
 			holder := &sqliteGateHolder{
 				id:       sqliteGateHolderSeq.Add(1),
@@ -125,16 +124,17 @@ func (g *sqliteWriteGate) Lock(ctx context.Context) (*sqliteGateHolder, error) {
 			g.owner = holder
 			return holder, nil
 		}
-		if ctx.Err() != nil {
-			return nil, ctx.Err()
-		}
-		if time.Since(g.owner.acquired) > sqliteGateHoldLimit {
+		remaining := sqliteGateHoldLimit - time.Since(g.owner.acquired)
+		if remaining <= 0 {
 			// 持有者疑似 panic 泄漏（After 回调未执行）：强制回收。
 			g.owner = nil
 			g.cond.Broadcast()
 			continue
 		}
+		// 无后续写入或取消时，也要在租约到期后主动唤醒等待者。
+		timer := time.AfterFunc(remaining, wake)
 		g.cond.Wait()
+		timer.Stop()
 	}
 }
 

internal/database/sqlite_runtime_test.go

@@ -0,0 +1,79 @@
+package database
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+)
+
+func TestSQLiteWriteGateRejectsCancelledContext(t *testing.T) {
+	ctx, cancel := context.WithCancel(t.Context())
+	cancel()
+	gate := newSQLiteWriteGate()
+	holder, err := gate.Lock(ctx)
+	defer gate.Unlock(holder)
+	if !errors.Is(err, context.Canceled) {
+		t.Fatalf("Lock error=%v, want context.Canceled", err)
+	}
+}
+
+func TestSQLiteWriteGateWakesForExpiredHolder(t *testing.T) {
+	gate := newSQLiteWriteGate()
+	holder, err := gate.Lock(t.Context())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer gate.Unlock(holder)
+	// Make the lease expire shortly, without waiting a full minute.
+	gate.mu.Lock()
+	holder.acquired = time.Now().Add(-sqliteGateHoldLimit + 20*time.Millisecond)
+	gate.mu.Unlock()
+	done := make(chan *sqliteGateHolder, 1)
+	go func() {
+		next, _ := gate.Lock(t.Context())
+		done <- next
+	}()
+	select {
+	case next := <-done:
+		gate.Unlock(holder) // A stale holder must not unlock its successor.
+		gate.mu.Lock()
+		owner := gate.owner
+		gate.mu.Unlock()
+		gate.Unlock(next)
+		if next == nil || owner != next {
+			t.Fatal("expired holder released the new owner's lock")
+		}
+	case <-time.After(time.Second):
+		gate.Unlock(holder)
+		gate.Unlock(<-done)
+		t.Fatal("waiter was not woken when the holder expired")
+	}
+}
+
+func TestSQLiteWriteGateWakesForCancellation(t *testing.T) {
+	gate := newSQLiteWriteGate()
+	holder, err := gate.Lock(t.Context())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer gate.Unlock(holder)
+	ctx, cancel := context.WithCancel(t.Context())
+	done := make(chan error, 1)
+	go func() {
+		next, err := gate.Lock(ctx)
+		gate.Unlock(next)
+		done <- err
+	}()
+	cancel()
+	select {
+	case err := <-done:
+		if !errors.Is(err, context.Canceled) {
+			t.Fatalf("Lock error=%v, want context.Canceled", err)
+		}
+	case <-time.After(time.Second):
+		gate.Unlock(holder)
+		<-done
+		t.Fatal("waiter was not woken for cancellation")
+	}
+}

internal/handler/admin_settings.go

@@ -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 {

internal/handler/background_tasks.go

@@ -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())
+	}
+}

internal/handler/backup.go

@@ -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})
 	}
 }

internal/handler/cloud115_playback.go

@@ -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,

internal/handler/cloud_download.go

@@ -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})
+	}
+}

internal/handler/emby_home_compat_test.go

@@ -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))
+	}
+}

internal/handler/emby_images.go

@@ -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.

internal/handler/emby_media_segments.go

@@ -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
 			}

internal/handler/emby_mounts.go

@@ -197,6 +197,32 @@ func deleteEmbyMountHandler(svc *service.Container) gin.HandlerFunc {
 	}
 }
 
+// setEmbyMountsEnabledHandler 一键启用/停用某账号下的全部挂载。
+//
+// 远端整站不可用时（如 Cloudflare 522），管理员可以用它把该账号的挂载
+// 全部从媒体库摘掉，首页立刻只返回本地库；远端恢复后再一键启用。
+func setEmbyMountsEnabledHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		var req struct {
+			Enabled *bool `json:"enabled" binding:"required"`
+		}
+		if err := c.ShouldBindJSON(&req); err != nil {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+			return
+		}
+		if svc.EmbyRemote == nil {
+			c.JSON(http.StatusServiceUnavailable, gin.H{"error": "emby remote service not available"})
+			return
+		}
+		affected, err := svc.EmbyRemote.SetMountsEnabled(c.Request.Context(), c.Param("id"), *req.Enabled)
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusOK, gin.H{"ok": true, "affected": affected})
+	}
+}
+
 type reorderEmbyMountsReq struct {
 	IDs []string `json:"ids" binding:"required"`
 }

internal/handler/emby_mounts_enabled_test.go

@@ -0,0 +1,108 @@
+package handler
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/glebarez/sqlite"
+	"go.uber.org/zap"
+	"gorm.io/gorm"
+
+	"github.com/truewhile/MeBox/internal/database"
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+// TestSetEmbyMountsEnabledHandler 覆盖「一键停用/启用某账号下全部挂载」：
+// 只影响目标账号，且配置保留（不是删除）。
+func TestSetEmbyMountsEnabledHandler(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := database.AutoMigrate(db); err != nil {
+		t.Fatal(err)
+	}
+	repos := repository.New(db)
+	ctx := t.Context()
+
+	m1 := &model.EmbyMount{AccountID: "acct-1", RemoteViewID: "view-1", Enabled: true}
+	m2 := &model.EmbyMount{AccountID: "acct-1", RemoteViewID: "view-2", Enabled: true}
+	other := &model.EmbyMount{AccountID: "acct-2", RemoteViewID: "view-3", Enabled: true}
+	for _, m := range []*model.EmbyMount{m1, m2, other} {
+		if err := repos.EmbyMount.Create(ctx, m); err != nil {
+			t.Fatalf("create mount: %v", err)
+		}
+	}
+
+	svc := &service.Container{
+		Repo:       repos,
+		EmbyRemote: service.NewEmbyRemoteService(nil, zap.NewNop(), repos, nil),
+	}
+	router := gin.New()
+	router.PUT("/admin/emby/accounts/:id/mounts/enabled", setEmbyMountsEnabledHandler(svc))
+
+	call := func(body map[string]any) *httptest.ResponseRecorder {
+		raw, _ := json.Marshal(body)
+		req := httptest.NewRequest(http.MethodPut, "/admin/emby/accounts/acct-1/mounts/enabled", bytes.NewReader(raw))
+		req.Header.Set("Content-Type", "application/json")
+		w := httptest.NewRecorder()
+		router.ServeHTTP(w, req)
+		return w
+	}
+
+	w := call(map[string]any{"enabled": false})
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d: %s", w.Code, w.Body.String())
+	}
+	var resp struct {
+		OK       bool  `json:"ok"`
+		Affected int64 `json:"affected"`
+	}
+	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
+		t.Fatalf("decode response: %v", err)
+	}
+	if !resp.OK || resp.Affected != 2 {
+		t.Fatalf("expected ok with affected=2, got %+v", resp)
+	}
+
+	rows, err := repos.EmbyMount.List(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, row := range rows {
+		want := row.AccountID != "acct-1" // 目标账号停用，其他账号不受影响
+		if row.Enabled != want {
+			t.Fatalf("mount %s enabled=%v, want %v", row.ID, row.Enabled, want)
+		}
+	}
+
+	// 重新启用：挂载记录仍在，只是开关回 true。
+	w = call(map[string]any{"enabled": true})
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d: %s", w.Code, w.Body.String())
+	}
+	rows, err = repos.EmbyMount.List(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(rows) != 3 {
+		t.Fatalf("expected mounts to be preserved, got %d rows", len(rows))
+	}
+	for _, row := range rows {
+		if !row.Enabled {
+			t.Fatalf("mount %s should be enabled again", row.ID)
+		}
+	}
+
+	// 缺少 enabled 字段必须拒绝，避免误把全部挂载停掉。
+	if w := call(map[string]any{}); w.Code != http.StatusBadRequest {
+		t.Fatalf("expected 400 for missing enabled, got %d: %s", w.Code, w.Body.String())
+	}
+}

internal/handler/emby_playback.go

@@ -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)
 		}
 	}

internal/handler/emby_routes.go

@@ -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))
 }

internal/handler/emby_routes_lowercase.go

@@ -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))
 }
 

internal/handler/handler.go

@@ -46,6 +46,8 @@ func Register(r *gin.Engine, cfg *config.Config, log *zap.Logger, svc *service.C
 
 		registerPublicAuthRoutes(api, svc, log)
 
+		registerMobileRoutes(api, svc, log)
+
 		registerAuthenticatedRoutes(api, cfg, svc)
 
 		registerAdminRoutes(api, cfg, svc)

internal/handler/hls_session_test.go

@@ -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())
+	}
+}

internal/handler/library_cover.go

@@ -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)
+}

internal/handler/library_cover_route_test.go

@@ -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())
+	}
+}

internal/handler/library_cover_test.go

@@ -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())
+	}
+}

internal/handler/media.go

@@ -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)})
 		}
 	}
 }
@@ -556,19 +590,17 @@ func listMediaHandler(svc *service.Container) gin.HandlerFunc {
 			})
 			return
 		}
-		grouped, err := svc.Media.GroupedMediaVisibleFiltered(ctx, id, mediaVisibilityForRequest(c, svc), filters)
+		items, total, err := svc.Media.ListMediaVisibleSortedPage(ctx, id, page, size, mediaVisibilityForRequest(c, svc), filters, sortSpec, history)
 		if err != nil {
 			writeInternalOrCanceled(c, err)
 			return
 		}
-		grouped = service.SortMediaItems(grouped, sortSpec.Field, sortSpec.Order, history)
-		items := service.PaginateMediaItems(grouped, page, size)
 		if items == nil {
 			items = []service.MediaItem{}
 		}
 		c.JSON(http.StatusOK, gin.H{
 			"items":     items,
-			"total":     len(grouped),
+			"total":     total,
 			"page":      page,
 			"page_size": size,
 		})
@@ -656,6 +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{}
@@ -670,127 +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()

internal/handler/media_libraries_preview_test.go

@@ -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))
+	}
+}

internal/handler/media_quality.go

@@ -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})
+	}
+}

internal/handler/media_search_filters_test.go

@@ -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)
+			}
+		})
+	}
+}

internal/handler/media_search_remote_test.go

@@ -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)
+	}
+}

internal/handler/media_search_test.go

@@ -0,0 +1,122 @@
+package handler
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strings"
+	"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 TestSearchMediaSeriesKeepsRemoteLibrariesSeparate(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(map[string]any{
+			"TotalRecordCount": 1,
+			"Items": []map[string]any{{
+				"Id": "same-series", "Name": "龙珠改", "Type": "Series",
+				"ProviderIds":    map[string]string{"Tmdb": "61709"},
+				"ProductionYear": 2024, "Genres": []string{"Science Fiction"},
+			}},
+		})
+	}))
+	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)
+	lib := model.Library{Name: "本地番剧", Path: "/media/anime", Type: "anime", Enabled: true}
+	if err := repos.Library.Create(t.Context(), &lib); err != nil {
+		t.Fatal(err)
+	}
+	rows := []model.Media{
+		{Base: model.Base{ID: "local-1"}, LibraryID: lib.ID, Title: "龙珠改", Path: "/media/anime/龙珠改/Season 1/ep1.mkv", SeasonNum: 1, EpisodeNum: 1, TMDbID: 61709},
+		{Base: model.Base{ID: "local-2"}, LibraryID: lib.ID, Title: "龙珠改", Path: "/media/anime/龙珠改/Season 1/ep2.mkv", SeasonNum: 1, EpisodeNum: 2, TMDbID: 61709},
+	}
+	if err := db.Create(&rows).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: "account"}, Name: "Emby", Provider: model.StrmProviderEmbyRemote, Config: string(rawConfig), Enabled: true}
+	if err := repos.StrmAccount.Create(t.Context(), &acct); err != nil {
+		t.Fatal(err)
+	}
+	expectedIDs := map[string]string{lib.ID: "local-1"}
+	for _, suffix := range []string{"a", "b"} {
+		mount := model.EmbyMount{Base: model.Base{ID: "mount-" + suffix}, AccountID: acct.ID, RemoteViewID: "view-" + suffix, RemoteViewName: "番剧" + suffix, CollectionType: "tvshows", Enabled: true}
+		if err := repos.EmbyMount.Create(t.Context(), &mount); err != nil {
+			t.Fatal(err)
+		}
+		expectedIDs[service.EncodeEmbyRemoteID(mount.ID, mount.RemoteViewID)] = service.EncodeEmbyRemoteID(mount.ID, "same-series")
+	}
+	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())),
+	}
+
+	request := func(params string) ([]model.Media, int) {
+		t.Helper()
+		w := httptest.NewRecorder()
+		c, _ := gin.CreateTestContext(w)
+		c.Set(middleware.CtxUserID, "admin")
+		c.Set(middleware.CtxUserRole, "admin")
+		c.Request = httptest.NewRequest(http.MethodGet, "/api/media?q=龙珠改&group_series=1&"+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 []model.Media `json:"items"`
+			Total int           `json:"total"`
+		}
+		if err := json.Unmarshal(w.Body.Bytes(), &response); err != nil {
+			t.Fatal(err)
+		}
+		return response.Items, response.Total
+	}
+
+	items, _ := request("limit=8")
+	if len(items) != len(expectedIDs) {
+		t.Fatalf("got %d results, want one local series and two remote series: %#v", len(items), items)
+	}
+	seen := make(map[string]bool)
+	for page := 1; page <= len(expectedIDs); page++ {
+		items, total := request(fmt.Sprintf("page=%d&page_size=1", page))
+		if total != len(expectedIDs) || len(items) != 1 {
+			t.Fatalf("page %d: total=%d items=%#v, want total=3 and one item", page, total, items)
+		}
+		item := items[0]
+		if expectedIDs[item.DisplayLibraryID] != item.ID || seen[item.DisplayLibraryID] || item.DisplayLibraryName == "" {
+			t.Fatalf("page %d lost or repeated a library's series identity: %#v", page, item)
+		}
+		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)
+	}
+}

internal/handler/media_test.go

@@ -26,7 +26,9 @@ import (
 )
 
 func TestQueueLibraryRootScanImportsNewLibraryMedia(t *testing.T) {
-	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	// The scanner and polling loop use separate connections; :memory: gives
+	// each connection its own empty database.
+	db, err := gorm.Open(sqlite.Open(filepath.Join(t.TempDir(), "scan.db")+"?_pragma=journal_mode(WAL)&_pragma=busy_timeout(5000)"), &gorm.Config{})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -557,7 +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)
 	}

internal/handler/mobile_auth.go

@@ -0,0 +1,395 @@
+// Package handler — 移动端 /api/v1 认证端点。
+package handler
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/middleware"
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+// mobileUserPayload 是 v1 返回的用户摘要。这里显式挑选字段，避免把仅服务端
+// 使用的偏好和内部状态带进新契约。
+type mobileUserPayload struct {
+	ID                 string     `json:"id"`
+	Username           string     `json:"username"`
+	Nickname           string     `json:"nickname,omitempty"`
+	Role               string     `json:"role"`
+	Tier               string     `json:"tier"`
+	IsActive           bool       `json:"is_active"`
+	ForcePasswordReset bool       `json:"force_password_reset"`
+	ExpiresAt          *time.Time `json:"expires_at,omitempty"`
+}
+
+func toMobileUserPayload(u *model.User) *mobileUserPayload {
+	if u == nil {
+		return nil
+	}
+	return &mobileUserPayload{
+		ID:                 u.ID,
+		Username:           u.Username,
+		Nickname:           u.Nickname,
+		Role:               u.Role,
+		Tier:               u.Tier,
+		IsActive:           u.IsActive,
+		ForcePasswordReset: u.ForcePasswordReset,
+		ExpiresAt:          u.ExpiredAt,
+	}
+}
+
+type mobileSessionPayload struct {
+	AuthSessionID string    `json:"auth_session_id"`
+	DeviceID      string    `json:"device_id"`
+	DeviceName    string    `json:"device_name,omitempty"`
+	ClientName    string    `json:"client_name,omitempty"`
+	ClientVersion string    `json:"client_version,omitempty"`
+	CreatedAt     time.Time `json:"created_at"`
+	LastUsedAt    time.Time `json:"last_used_at"`
+	ExpiresAt     time.Time `json:"expires_at"`
+}
+
+func toMobileSessionPayload(s *model.AuthSession) *mobileSessionPayload {
+	if s == nil {
+		return nil
+	}
+	return &mobileSessionPayload{
+		AuthSessionID: s.ID,
+		DeviceID:      s.DeviceID,
+		DeviceName:    s.DeviceName,
+		ClientName:    s.ClientName,
+		ClientVersion: s.ClientVersion,
+		CreatedAt:     s.CreatedAt,
+		LastUsedAt:    s.LastUsedAt,
+		ExpiresAt:     s.ExpiresAt,
+	}
+}
+
+type mobileLoginRequest struct {
+	Username      string `json:"username" binding:"required"`
+	Password      string `json:"password" binding:"required"`
+	DeviceID      string `json:"device_id" binding:"required"`
+	DeviceName    string `json:"device_name"`
+	ClientName    string `json:"client_name"`
+	ClientVersion string `json:"client_version"`
+}
+
+type mobileRefreshRequest struct {
+	RefreshToken string `json:"refresh_token" binding:"required"`
+}
+
+// mobileAuthRequired 是 v1 专用认证中间件：要求有效 JWT + 有效设备会话，
+// 并统一输出 v1 错误契约。
+func mobileAuthRequired(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		raw := middleware.ExtractToken(c)
+		if raw == "" {
+			writeMobileError(c, http.StatusUnauthorized, mobileCodeInvalidCredentials,
+				"access token required", false, 0)
+			return
+		}
+		claims, err := svc.Token.ValidateAccessToken(raw)
+		if err != nil {
+			if errors.Is(err, jwt.ErrTokenExpired) {
+				writeMobileError(c, http.StatusUnauthorized, mobileCodeTokenExpired,
+					"access token expired", false, 0)
+				return
+			}
+			writeMobileError(c, http.StatusUnauthorized, mobileCodeInvalidCredentials,
+				"invalid access token", false, 0)
+			return
+		}
+		if strings.TrimSpace(claims.Purpose) != "" {
+			writeMobileError(c, http.StatusForbidden, mobileCodePermissionDenied,
+				"token scope denied for this endpoint", false, 0)
+			return
+		}
+		sessionID := strings.TrimSpace(claims.Sid)
+		if sessionID == "" {
+			// v1 客户端必须使用登录时创建的会话；旧网页令牌不进入移动端契约。
+			writeMobileError(c, http.StatusUnauthorized, mobileCodeInvalidCredentials,
+				"auth session required; sign in again", false, 0)
+			return
+		}
+		session, err := svc.AuthSessions.Validate(c.Request.Context(), sessionID, claims.UserID)
+		if err != nil {
+			if service.IsTransientDatabaseLock(err) {
+				writeMobileError(c, http.StatusServiceUnavailable, mobileCodeServiceUnavailable,
+					"auth session check temporarily unavailable", true, 2)
+				return
+			}
+			writeMobileError(c, http.StatusUnauthorized, mobileCodeSessionRevoked,
+				"auth session revoked or expired", false, 0)
+			return
+		}
+		c.Set(middleware.CtxUserID, claims.UserID)
+		c.Set(middleware.CtxUserRole, claims.Role)
+		c.Set(middleware.CtxUserTier, claims.Tier)
+		c.Set(middleware.CtxAuthSessionID, sessionID)
+		c.Set(mobileCtxAuthSession, session)
+		// 每个请求写一次 last_used_at 会在 SQLite 上造成不必要的写锁竞争；
+		// 一分钟内的重复请求不更新，足以支撑设备列表的“最近活动”。
+		if time.Since(session.LastUsedAt) > time.Minute {
+			svc.AuthSessions.Touch(c.Request.Context(), sessionID)
+		}
+		c.Next()
+	}
+}
+
+// mobileLogoutAuthRequired 只校验 JWT 与 sid，不要求会话仍然有效。
+// 退出必须幂等：同一个令牌重复调用 logout 也要返回成功，而不是在第二次
+// 被会话校验拦成 401。
+func mobileLogoutAuthRequired(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		raw := middleware.ExtractToken(c)
+		if raw == "" {
+			writeMobileError(c, http.StatusUnauthorized, mobileCodeInvalidCredentials,
+				"access token required", false, 0)
+			return
+		}
+		claims, err := svc.Token.ValidateAccessToken(raw)
+		if err != nil {
+			if errors.Is(err, jwt.ErrTokenExpired) {
+				writeMobileError(c, http.StatusUnauthorized, mobileCodeTokenExpired,
+					"access token expired", false, 0)
+				return
+			}
+			writeMobileError(c, http.StatusUnauthorized, mobileCodeInvalidCredentials,
+				"invalid access token", false, 0)
+			return
+		}
+		sessionID := strings.TrimSpace(claims.Sid)
+		if sessionID == "" {
+			writeMobileError(c, http.StatusUnauthorized, mobileCodeInvalidCredentials,
+				"auth session required; sign in again", false, 0)
+			return
+		}
+		c.Set(middleware.CtxUserID, claims.UserID)
+		c.Set(middleware.CtxAuthSessionID, sessionID)
+		c.Next()
+	}
+}
+
+func mobileLoginHandler(svc *service.Container, log *zap.Logger) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		var req mobileLoginRequest
+		if err := c.ShouldBindJSON(&req); err != nil {
+			writeMobileError(c, http.StatusBadRequest, mobileCodeInvalidArgument,
+				"username, password and device_id are required", false, 0)
+			return
+		}
+		req.Username = strings.TrimSpace(req.Username)
+		req.DeviceID = strings.TrimSpace(req.DeviceID)
+		if req.Username == "" || req.DeviceID == "" || len(req.DeviceID) > 128 {
+			writeMobileError(c, http.StatusBadRequest, mobileCodeInvalidArgument,
+				"invalid username or device_id", false, 0)
+			return
+		}
+		ctx := c.Request.Context()
+		user, err := svc.Auth.Authenticate(ctx, req.Username, req.Password)
+		if err != nil {
+			writeMobileAuthError(c, log, err)
+			return
+		}
+
+		deviceName := strings.TrimSpace(req.DeviceName)
+		clientName := strings.TrimSpace(req.ClientName)
+		if clientName == "" {
+			clientName = "MeBox Android"
+		}
+		session, err := svc.AuthSessions.Create(ctx, service.CreateAuthSessionInput{
+			UserID:        user.ID,
+			DeviceID:      req.DeviceID,
+			DeviceName:    deviceName,
+			ClientName:    clientName,
+			ClientVersion: req.ClientVersion,
+		})
+		if err != nil {
+			if isTransientServiceError(err) {
+				writeMobileError(c, http.StatusServiceUnavailable, mobileCodeServiceUnavailable,
+					"cannot create auth session right now", true, 2)
+				return
+			}
+			writeMobileError(c, http.StatusBadRequest, mobileCodeInvalidArgument,
+				"invalid device information", false, 0)
+			return
+		}
+
+		tokens, err := svc.Token.IssuePairForSession(ctx, user.ID, user.Role, user.Tier, session.ID)
+		if err != nil {
+			// 令牌签发失败时回收会话，避免留下永远无法使用的会话记录。
+			_ = svc.AuthSessions.Revoke(ctx, session.ID)
+			writeMobileAuthError(c, log, err)
+			return
+		}
+		if svc.Device != nil {
+			svc.Device.RecordLogin(ctx, user.ID, session.DeviceID, deviceName, clientName, c.ClientIP())
+		}
+		if svc.Audit != nil {
+			svc.Audit.RecordBestEffort(user.ID, "auth.mobile.login", user.Username, c.ClientIP(), "")
+		}
+		c.JSON(http.StatusOK, gin.H{
+			"auth_session_id": session.ID,
+			"user":            toMobileUserPayload(user),
+			"tokens":          tokens,
+		})
+	}
+}
+
+func mobileRefreshHandler(svc *service.Container, log *zap.Logger) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		var req mobileRefreshRequest
+		if err := c.ShouldBindJSON(&req); err != nil {
+			writeMobileError(c, http.StatusBadRequest, mobileCodeInvalidArgument,
+				"refresh_token required", false, 0)
+			return
+		}
+		ctx := c.Request.Context()
+		rt, err := svc.Repo.RefreshToken.FindByHash(ctx, repository.HashToken(req.RefreshToken))
+		if err != nil {
+			if isTransientServiceError(err) {
+				writeMobileError(c, http.StatusServiceUnavailable, mobileCodeServiceUnavailable,
+					"token store temporarily unavailable", true, 2)
+				return
+			}
+			writeMobileAuthError(c, log, err)
+			return
+		}
+		// 只有 v1 登录签发的刷新令牌才带会话；旧网页令牌必须重新登录。
+		// 注意这里不能在 rt.Revoked 时提前返回：轮换宽限期内的幂等复用
+		// 由 TokenService 判定。
+		if rt == nil || strings.TrimSpace(rt.AuthSessionID) == "" {
+			writeMobileError(c, http.StatusUnauthorized, mobileCodeInvalidCredentials,
+				"refresh token is not bound to a device session; sign in again", false, 0)
+			return
+		}
+		if _, err := svc.AuthSessions.Validate(ctx, rt.AuthSessionID, rt.UserID); err != nil {
+			if isTransientServiceError(err) {
+				writeMobileError(c, http.StatusServiceUnavailable, mobileCodeServiceUnavailable,
+					"auth session check temporarily unavailable", true, 2)
+				return
+			}
+			writeMobileError(c, http.StatusUnauthorized, mobileCodeSessionRevoked,
+				"auth session revoked or expired", false, 0)
+			return
+		}
+
+		tokens, err := svc.Auth.RefreshTokens(ctx, req.RefreshToken)
+		if err != nil {
+			writeMobileAuthError(c, log, err)
+			return
+		}
+		user, err := svc.Repo.User.FindByID(ctx, rt.UserID)
+		if err != nil {
+			writeMobileAuthError(c, log, err)
+			return
+		}
+		if user == nil {
+			writeMobileError(c, http.StatusUnauthorized, mobileCodeInvalidCredentials,
+				"user not found", false, 0)
+			return
+		}
+		c.JSON(http.StatusOK, gin.H{
+			"auth_session_id": rt.AuthSessionID,
+			"user":            toMobileUserPayload(user),
+			"tokens":          tokens,
+		})
+	}
+}
+
+func mobileSessionHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		ctx := c.Request.Context()
+		userID := c.GetString(middleware.CtxUserID)
+		user, err := svc.Repo.User.FindByID(ctx, userID)
+		if err != nil {
+			writeMobileAuthError(c, svc.Log, err)
+			return
+		}
+		if user == nil {
+			writeMobileError(c, http.StatusUnauthorized, mobileCodeInvalidCredentials,
+				"user not found", false, 0)
+			return
+		}
+		session, _ := c.Get(mobileCtxAuthSession)
+		sessionModel, _ := session.(*model.AuthSession)
+		c.JSON(http.StatusOK, gin.H{
+			"auth_session_id": c.GetString(middleware.CtxAuthSessionID),
+			"user":            toMobileUserPayload(user),
+			"session":         toMobileSessionPayload(sessionModel),
+		})
+	}
+}
+
+func mobileLogoutHandler(svc *service.Container) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		sessionID := c.GetString(middleware.CtxAuthSessionID)
+		if err := svc.AuthSessions.Revoke(c.Request.Context(), sessionID); err != nil {
+			if isTransientServiceError(err) {
+				writeMobileError(c, http.StatusServiceUnavailable, mobileCodeServiceUnavailable,
+					"cannot revoke session right now", true, 2)
+				return
+			}
+			writeMobileError(c, http.StatusInternalServerError, mobileCodeServiceUnavailable,
+				"logout failed", false, 0)
+			return
+		}
+		c.JSON(http.StatusOK, gin.H{"status": "ok"})
+	}
+}
+
+// writeMobileAuthError 把 service 层错误映射为稳定错误码。
+// 临时性存储/基础设施错误必须返回可重试的 503，不能伪装成凭证失效。
+func writeMobileAuthError(c *gin.Context, log *zap.Logger, err error) {
+	switch {
+	case errors.Is(err, service.ErrInvalidCredentials), errors.Is(err, service.ErrInvalidRefreshToken):
+		writeMobileError(c, http.StatusUnauthorized, mobileCodeInvalidCredentials,
+			"invalid username, password or refresh token", false, 0)
+	case errors.Is(err, service.ErrTokenExpired):
+		writeMobileError(c, http.StatusUnauthorized, mobileCodeTokenExpired,
+			"refresh token expired", false, 0)
+	case errors.Is(err, service.ErrTokenRevoked),
+		errors.Is(err, service.ErrAuthSessionRevoked),
+		errors.Is(err, service.ErrAuthSessionExpired),
+		errors.Is(err, service.ErrAuthSessionRequired):
+		writeMobileError(c, http.StatusUnauthorized, mobileCodeSessionRevoked,
+			"auth session revoked or expired", false, 0)
+	case errors.Is(err, service.ErrUserInactive):
+		writeMobileError(c, http.StatusForbidden, mobileCodeAccountDisabled,
+			"account is disabled", false, 0)
+	case errors.Is(err, service.ErrUserExpired):
+		writeMobileError(c, http.StatusForbidden, mobileCodeAccountExpired,
+			"account has expired", false, 0)
+	case isTransientServiceError(err):
+		writeMobileError(c, http.StatusServiceUnavailable, mobileCodeServiceUnavailable,
+			"service temporarily unavailable, please retry", true, 2)
+	default:
+		if log != nil {
+			log.Warn("mobile auth request failed", zap.Error(err))
+		}
+		writeMobileError(c, http.StatusServiceUnavailable, mobileCodeServiceUnavailable,
+			"service temporarily unavailable, please retry", true, 2)
+	}
+}
+
+func isTransientServiceError(err error) bool {
+	if err == nil {
+		return false
+	}
+	if service.IsTransientDatabaseLock(err) {
+		return true
+	}
+	if errors.Is(err, context.DeadlineExceeded) || errors.Is(err, context.Canceled) {
+		return true
+	}
+	return false
+}

internal/handler/mobile_auth_test.go

@@ -0,0 +1,434 @@
+package handler
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/glebarez/sqlite"
+	"go.uber.org/zap"
+	"golang.org/x/crypto/bcrypt"
+	"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"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+const mobileTestSecret = "mobile-test-secret"
+
+func newMobileTestEnv(t *testing.T) (*gin.Engine, *service.Container) {
+	t.Helper()
+	gin.SetMode(gin.TestMode)
+
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{
+		Logger: logger.Default.LogMode(logger.Silent),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	sqlDB, err := db.DB()
+	if err != nil {
+		t.Fatal(err)
+	}
+	// :memory: 只有单连接能看到同一份数据；handler 测试足够，且避免
+	// shared cache 名字在并行测试间串库。
+	sqlDB.SetMaxOpenConns(1)
+	t.Cleanup(func() { _ = sqlDB.Close() })
+
+	if err := db.AutoMigrate(
+		&model.User{}, &model.RefreshToken{}, &model.AuthSession{}, &model.Setting{},
+		&model.UserDevice{}, &model.UserPermission{},
+	); err != nil {
+		t.Fatal(err)
+	}
+	repos := repository.New(db)
+	cfg := &config.Config{Secrets: config.SecretsConfig{JWTSecret: mobileTestSecret}}
+	svc := service.NewWithVersion(cfg, zap.NewNop(), repos, "MeBox-test")
+
+	router := gin.New()
+	Register(router, cfg, zap.NewNop(), svc)
+	return router, svc
+}
+
+func seedMobileUser(t *testing.T, svc *service.Container, username, password string) *model.User {
+	t.Helper()
+	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.MinCost)
+	if err != nil {
+		t.Fatal(err)
+	}
+	u := &model.User{Username: username, PasswordHash: string(hash), Role: "user", Tier: "free", IsActive: true}
+	if err := svc.Repo.User.Create(t.Context(), u); err != nil {
+		t.Fatal(err)
+	}
+	return u
+}
+
+func mobileJSONRequest(t *testing.T, router *gin.Engine, method, path, token string, body any, headers map[string]string) *httptest.ResponseRecorder {
+	t.Helper()
+	var reader *bytes.Reader
+	if body != nil {
+		raw, err := json.Marshal(body)
+		if err != nil {
+			t.Fatal(err)
+		}
+		reader = bytes.NewReader(raw)
+	} else {
+		reader = bytes.NewReader(nil)
+	}
+	req := httptest.NewRequest(method, path, reader)
+	req.Header.Set("Content-Type", "application/json")
+	if token != "" {
+		req.Header.Set("Authorization", "Bearer "+token)
+	}
+	for k, v := range headers {
+		req.Header.Set(k, v)
+	}
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+	return w
+}
+
+func decodeMobileJSON(t *testing.T, w *httptest.ResponseRecorder, out any) {
+	t.Helper()
+	if err := json.Unmarshal(w.Body.Bytes(), out); err != nil {
+		t.Fatalf("decode body %q: %v", w.Body.String(), err)
+	}
+}
+
+func TestMobileServerInfoAnonymousAndCacheable(t *testing.T) {
+	router, _ := newMobileTestEnv(t)
+	w := mobileJSONRequest(t, router, http.MethodGet, "/api/v1/server-info", "", nil, nil)
+	if w.Code != http.StatusOK {
+		t.Fatalf("status = %d body=%s", w.Code, w.Body.String())
+	}
+	if got := w.Header().Get("Cache-Control"); got != "no-store" {
+		t.Fatalf("Cache-Control = %q, want no-store", got)
+	}
+	var info service.ServerInfo
+	decodeMobileJSON(t, w, &info)
+	if info.ServerID == "" || info.ServerVersion != "MeBox-test" || info.APIVersion != "v1" {
+		t.Fatalf("unexpected server info: %+v", info)
+	}
+	if !info.Capabilities.DeviceSessions {
+		t.Fatalf("device_sessions capability should be true: %+v", info.Capabilities)
+	}
+	if info.Capabilities.PlaybackSessions || info.Capabilities.ReaderProgressV1 {
+		t.Fatalf("unimplemented capabilities must stay false: %+v", info.Capabilities)
+	}
+	if info.MinSupportedAppVersionCode < 1 {
+		t.Fatalf("min_supported_app_version_code = %d", info.MinSupportedAppVersionCode)
+	}
+
+	// 匿名访问不应要求 Authorization，也不应记录 cookie。
+	if len(w.Result().Cookies()) != 0 {
+		t.Fatalf("server-info should not set cookies")
+	}
+}
+
+func TestMobileAuthLifecycle(t *testing.T) {
+	router, svc := newMobileTestEnv(t)
+	user := seedMobileUser(t, svc, "alice", "secret-123")
+
+	// 1. 错误密码：401 + 稳定错误码 + request_id。
+	w := mobileJSONRequest(t, router, http.MethodPost, "/api/v1/auth/login", "", map[string]any{
+		"username": "alice", "password": "wrong", "device_id": "device-1",
+	}, map[string]string{"X-Request-ID": "mobile-test-0001"})
+	if w.Code != http.StatusUnauthorized {
+		t.Fatalf("wrong password status = %d body=%s", w.Code, w.Body.String())
+	}
+	var authErr mobileErrorBody
+	decodeMobileJSON(t, w, &authErr)
+	if authErr.Code != mobileCodeInvalidCredentials || authErr.RequestID != "mobile-test-0001" {
+		t.Fatalf("unexpected auth error: %+v", authErr)
+	}
+	if authErr.Retryable {
+		t.Fatalf("invalid credentials must not be retryable: %+v", authErr)
+	}
+
+	// 2. 缺少 device_id：400 INVALID_ARGUMENT。
+	w = mobileJSONRequest(t, router, http.MethodPost, "/api/v1/auth/login", "", map[string]any{
+		"username": "alice", "password": "secret-123",
+	}, nil)
+	if w.Code != http.StatusBadRequest {
+		t.Fatalf("missing device id status = %d body=%s", w.Code, w.Body.String())
+	}
+	decodeMobileJSON(t, w, &authErr)
+	if authErr.Code != mobileCodeInvalidArgument {
+		t.Fatalf("code = %q, want %q", authErr.Code, mobileCodeInvalidArgument)
+	}
+
+	// 3. 正常登录。
+	w = mobileJSONRequest(t, router, http.MethodPost, "/api/v1/auth/login", "", map[string]any{
+		"username": "alice", "password": "secret-123", "device_id": "device-1",
+		"device_name": "Pixel 9", "client_name": "MeBox Android", "client_version": "1.0.0",
+	}, nil)
+	if w.Code != http.StatusOK {
+		t.Fatalf("login status = %d body=%s", w.Code, w.Body.String())
+	}
+	var loginResp struct {
+		AuthSessionID string            `json:"auth_session_id"`
+		User          mobileUserPayload `json:"user"`
+		Tokens        service.TokenPair `json:"tokens"`
+	}
+	decodeMobileJSON(t, w, &loginResp)
+	if loginResp.AuthSessionID == "" || loginResp.Tokens.AccessToken == "" || loginResp.Tokens.RefreshToken == "" {
+		t.Fatalf("incomplete login response: %+v", loginResp)
+	}
+	if loginResp.User.ID != user.ID || loginResp.User.Username != "alice" {
+		t.Fatalf("unexpected user payload: %+v", loginResp.User)
+	}
+	claims, err := svc.Token.ValidateAccessToken(loginResp.Tokens.AccessToken)
+	if err != nil {
+		t.Fatalf("validate access token: %v", err)
+	}
+	if claims.Sid != loginResp.AuthSessionID {
+		t.Fatalf("token sid = %q, want %q", claims.Sid, loginResp.AuthSessionID)
+	}
+	rt, err := svc.Repo.RefreshToken.FindByHash(t.Context(), repository.HashToken(loginResp.Tokens.RefreshToken))
+	if err != nil || rt == nil || rt.AuthSessionID != loginResp.AuthSessionID {
+		t.Fatalf("refresh token not bound to session: %+v err=%v", rt, err)
+	}
+
+	// 4. 会话读取。
+	w = mobileJSONRequest(t, router, http.MethodGet, "/api/v1/auth/session", loginResp.Tokens.AccessToken, nil, nil)
+	if w.Code != http.StatusOK {
+		t.Fatalf("session status = %d body=%s", w.Code, w.Body.String())
+	}
+	var sessionResp struct {
+		AuthSessionID string                `json:"auth_session_id"`
+		User          mobileUserPayload     `json:"user"`
+		Session       *mobileSessionPayload `json:"session"`
+	}
+	decodeMobileJSON(t, w, &sessionResp)
+	if sessionResp.AuthSessionID != loginResp.AuthSessionID || sessionResp.Session == nil {
+		t.Fatalf("unexpected session response: %+v", sessionResp)
+	}
+	if sessionResp.Session.DeviceID != "device-1" || sessionResp.Session.DeviceName != "Pixel 9" {
+		t.Fatalf("unexpected session payload: %+v", sessionResp.Session)
+	}
+
+	// 5. 刷新：新令牌继续归属同一会话，旧刷新令牌被撤销。
+	w = mobileJSONRequest(t, router, http.MethodPost, "/api/v1/auth/refresh", "", map[string]any{
+		"refresh_token": loginResp.Tokens.RefreshToken,
+	}, nil)
+	if w.Code != http.StatusOK {
+		t.Fatalf("refresh status = %d body=%s", w.Code, w.Body.String())
+	}
+	var refreshResp struct {
+		AuthSessionID string            `json:"auth_session_id"`
+		Tokens        service.TokenPair `json:"tokens"`
+	}
+	decodeMobileJSON(t, w, &refreshResp)
+	if refreshResp.AuthSessionID != loginResp.AuthSessionID || refreshResp.Tokens.AccessToken == "" {
+		t.Fatalf("unexpected refresh response: %+v", refreshResp)
+	}
+	if refreshResp.Tokens.RefreshToken == loginResp.Tokens.RefreshToken {
+		t.Fatal("refresh token should rotate")
+	}
+	oldRT, err := svc.Repo.RefreshToken.FindByHash(t.Context(), repository.HashToken(loginResp.Tokens.RefreshToken))
+	if err != nil || oldRT == nil || !oldRT.Revoked {
+		t.Fatalf("old refresh token should be revoked: %+v err=%v", oldRT, err)
+	}
+
+	// 6. 用刷新后的访问令牌访问旧 API，确认 sid 会话校验在旧入口同样生效。
+	w = mobileJSONRequest(t, router, http.MethodGet, "/api/me", refreshResp.Tokens.AccessToken, nil, nil)
+	if w.Code != http.StatusOK {
+		t.Fatalf("old api with fresh token status = %d body=%s", w.Code, w.Body.String())
+	}
+
+	// 7. 退出：成功且可重复。
+	for i := 0; i < 2; i++ {
+		w = mobileJSONRequest(t, router, http.MethodPost, "/api/v1/auth/logout", refreshResp.Tokens.AccessToken, nil, nil)
+		if w.Code != http.StatusOK {
+			t.Fatalf("logout #%d status = %d body=%s", i+1, w.Code, w.Body.String())
+		}
+	}
+
+	// 8. 会话撤销后：v1 会话接口 401 SESSION_REVOKED。
+	w = mobileJSONRequest(t, router, http.MethodGet, "/api/v1/auth/session", refreshResp.Tokens.AccessToken, nil, nil)
+	if w.Code != http.StatusUnauthorized {
+		t.Fatalf("session after logout status = %d body=%s", w.Code, w.Body.String())
+	}
+	decodeMobileJSON(t, w, &authErr)
+	if authErr.Code != mobileCodeSessionRevoked {
+		t.Fatalf("session after logout code = %q, want %q", authErr.Code, mobileCodeSessionRevoked)
+	}
+
+	// 9. 被踢后的未过期 JWT 不能绕过旧 API。
+	w = mobileJSONRequest(t, router, http.MethodGet, "/api/me", refreshResp.Tokens.AccessToken, nil, nil)
+	if w.Code != http.StatusUnauthorized {
+		t.Fatalf("old api after logout status = %d body=%s", w.Code, w.Body.String())
+	}
+
+	// 10. 刷新令牌随会话一起撤销。
+	w = mobileJSONRequest(t, router, http.MethodPost, "/api/v1/auth/refresh", "", map[string]any{
+		"refresh_token": refreshResp.Tokens.RefreshToken,
+	}, nil)
+	if w.Code != http.StatusUnauthorized {
+		t.Fatalf("refresh after logout status = %d body=%s", w.Code, w.Body.String())
+	}
+	decodeMobileJSON(t, w, &authErr)
+	if authErr.Code != mobileCodeSessionRevoked {
+		t.Fatalf("refresh after logout code = %q, want %q", authErr.Code, mobileCodeSessionRevoked)
+	}
+}
+
+func TestMobileV1RejectsLegacyTokenWithoutSid(t *testing.T) {
+	router, svc := newMobileTestEnv(t)
+	user := seedMobileUser(t, svc, "legacy", "secret-123")
+	pair, err := svc.Token.IssuePair(t.Context(), user.ID, user.Role, user.Tier)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if claims, err := svc.Token.ValidateAccessToken(pair.AccessToken); err != nil || claims.Sid != "" {
+		t.Fatalf("legacy token unexpectedly has sid: %+v err=%v", claims, err)
+	}
+
+	w := mobileJSONRequest(t, router, http.MethodGet, "/api/v1/auth/session", pair.AccessToken, nil, nil)
+	if w.Code != http.StatusUnauthorized {
+		t.Fatalf("legacy token status = %d body=%s", w.Code, w.Body.String())
+	}
+	var body mobileErrorBody
+	decodeMobileJSON(t, w, &body)
+	if body.Code != mobileCodeInvalidCredentials {
+		t.Fatalf("legacy token code = %q, want %q", body.Code, mobileCodeInvalidCredentials)
+	}
+
+	// 旧令牌仍可访问旧 API（兼容路径不能被新协议破坏）。
+	w = mobileJSONRequest(t, router, http.MethodGet, "/api/me", pair.AccessToken, nil, nil)
+	if w.Code != http.StatusOK {
+		t.Fatalf("legacy token on old api status = %d body=%s", w.Code, w.Body.String())
+	}
+}
+
+func TestMobileRefreshRejectsUnboundLegacyToken(t *testing.T) {
+	router, svc := newMobileTestEnv(t)
+	user := seedMobileUser(t, svc, "bob", "secret-123")
+	pair, err := svc.Token.IssuePair(t.Context(), user.ID, user.Role, user.Tier)
+	if err != nil {
+		t.Fatal(err)
+	}
+	w := mobileJSONRequest(t, router, http.MethodPost, "/api/v1/auth/refresh", "", map[string]any{
+		"refresh_token": pair.RefreshToken,
+	}, nil)
+	if w.Code != http.StatusUnauthorized {
+		t.Fatalf("legacy refresh status = %d body=%s", w.Code, w.Body.String())
+	}
+	var body mobileErrorBody
+	decodeMobileJSON(t, w, &body)
+	if body.Code != mobileCodeInvalidCredentials {
+		t.Fatalf("legacy refresh code = %q, want %q", body.Code, mobileCodeInvalidCredentials)
+	}
+}
+
+func TestMobileDeviceKickRevokesSession(t *testing.T) {
+	router, svc := newMobileTestEnv(t)
+	user := seedMobileUser(t, svc, "carol", "secret-123")
+
+	w := mobileJSONRequest(t, router, http.MethodPost, "/api/v1/auth/login", "", map[string]any{
+		"username": "carol", "password": "secret-123", "device_id": "device-kick",
+		"device_name": "Kick Me", "client_name": "MeBox Android",
+	}, nil)
+	if w.Code != http.StatusOK {
+		t.Fatalf("login status = %d body=%s", w.Code, w.Body.String())
+	}
+	var loginResp struct {
+		AuthSessionID string            `json:"auth_session_id"`
+		Tokens        service.TokenPair `json:"tokens"`
+	}
+	decodeMobileJSON(t, w, &loginResp)
+
+	if err := svc.Device.KickDevice(t.Context(), user.ID, "device-kick"); err != nil {
+		t.Fatalf("kick device: %v", err)
+	}
+	session, err := svc.Repo.AuthSession.FindByID(t.Context(), loginResp.AuthSessionID)
+	if err != nil || session == nil || !session.Revoked {
+		t.Fatalf("session should be revoked after device kick: %+v err=%v", session, err)
+	}
+	w = mobileJSONRequest(t, router, http.MethodGet, "/api/v1/auth/session", loginResp.Tokens.AccessToken, nil, nil)
+	if w.Code != http.StatusUnauthorized {
+		t.Fatalf("session after kick status = %d body=%s", w.Code, w.Body.String())
+	}
+}
+
+func TestMobileKickOneDeviceKeepsOtherSessions(t *testing.T) {
+	router, svc := newMobileTestEnv(t)
+	seedMobileUser(t, svc, "erin", "secret-123")
+
+	login := func(deviceID string) string {
+		w := mobileJSONRequest(t, router, http.MethodPost, "/api/v1/auth/login", "", map[string]any{
+			"username": "erin", "password": "secret-123", "device_id": deviceID,
+			"device_name": deviceID, "client_name": "MeBox Android",
+		}, nil)
+		if w.Code != http.StatusOK {
+			t.Fatalf("login %s status = %d body=%s", deviceID, w.Code, w.Body.String())
+		}
+		var resp struct {
+			Tokens service.TokenPair `json:"tokens"`
+		}
+		decodeMobileJSON(t, w, &resp)
+		return resp.Tokens.AccessToken
+	}
+
+	tokenA := login("device-a")
+	tokenB := login("device-b")
+
+	if err := svc.Device.KickDevice(t.Context(), svcUserID(t, svc, "erin"), "device-a"); err != nil {
+		t.Fatalf("kick device a: %v", err)
+	}
+
+	w := mobileJSONRequest(t, router, http.MethodGet, "/api/v1/auth/session", tokenA, nil, nil)
+	if w.Code != http.StatusUnauthorized {
+		t.Fatalf("kicked session status = %d body=%s", w.Code, w.Body.String())
+	}
+	w = mobileJSONRequest(t, router, http.MethodGet, "/api/v1/auth/session", tokenB, nil, nil)
+	if w.Code != http.StatusOK {
+		t.Fatalf("other device status = %d body=%s", w.Code, w.Body.String())
+	}
+}
+
+func svcUserID(t *testing.T, svc *service.Container, username string) string {
+	t.Helper()
+	u, err := svc.Repo.User.FindByUsername(t.Context(), username)
+	if err != nil || u == nil {
+		t.Fatalf("find user %s: %v", username, err)
+	}
+	return u.ID
+}
+
+func TestMobileAuthDefaultsAndSessionExpiryShape(t *testing.T) {
+	router, svc := newMobileTestEnv(t)
+	seedMobileUser(t, svc, "dave", "secret-123")
+
+	w := mobileJSONRequest(t, router, http.MethodPost, "/api/v1/auth/login", "", map[string]any{
+		"username": "dave", "password": "secret-123", "device_id": "device-default",
+	}, nil)
+	if w.Code != http.StatusOK {
+		t.Fatalf("login status = %d body=%s", w.Code, w.Body.String())
+	}
+	var loginResp struct {
+		AuthSessionID string            `json:"auth_session_id"`
+		Tokens        service.TokenPair `json:"tokens"`
+	}
+	decodeMobileJSON(t, w, &loginResp)
+	session, err := svc.Repo.AuthSession.FindByID(t.Context(), loginResp.AuthSessionID)
+	if err != nil || session == nil {
+		t.Fatalf("load session: %v", err)
+	}
+	if session.ClientName != "MeBox Android" {
+		t.Fatalf("client_name default = %q", session.ClientName)
+	}
+	if session.ExpiresAt.Before(time.Now()) {
+		t.Fatalf("session expiry in the past: %v", session.ExpiresAt)
+	}
+	if loginResp.Tokens.TokenType != "Bearer" || loginResp.Tokens.ExpiresIn <= 0 {
+		t.Fatalf("unexpected token metadata: %+v", loginResp.Tokens)
+	}
+}

internal/handler/mobile_errors.go

@@ -0,0 +1,129 @@
+package handler
+
+import (
+	"net/http"
+	"strconv"
+	"strings"
+	"unicode"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+
+	"github.com/truewhile/MeBox/internal/middleware"
+)
+
+// 移动端 v1 错误码。新增错误码必须同步 OpenAPI 与 App 的 ApiErrorMapper。
+const (
+	mobileCodeInvalidArgument       = "INVALID_ARGUMENT"
+	mobileCodeInvalidCredentials    = "INVALID_CREDENTIALS"
+	mobileCodeTokenExpired          = "TOKEN_EXPIRED"
+	mobileCodeSessionRevoked        = "SESSION_REVOKED"
+	mobileCodeAccountDisabled       = "ACCOUNT_DISABLED"
+	mobileCodeAccountExpired        = "ACCOUNT_EXPIRED"
+	mobileCodePermissionDenied      = "PERMISSION_DENIED"
+	mobileCodeProfilePINRequired    = "PROFILE_PIN_REQUIRED"
+	mobileCodeRateLimited           = "RATE_LIMITED"
+	mobileCodeUpstreamUnavailable   = "UPSTREAM_UNAVAILABLE"
+	mobileCodeTranscodeBusy         = "TRANSCODE_BUSY"
+	mobileCodePlaybackSessionAbsent = "PLAYBACK_SESSION_NOT_FOUND"
+	mobileCodeResourceExpired       = "RESOURCE_EXPIRED"
+	mobileCodeProgressConflict      = "PROGRESS_CONFLICT"
+	mobileCodeServiceUnavailable    = "SERVICE_UNAVAILABLE"
+)
+
+const (
+	mobileCtxRequestID    = "mobile_request_id"
+	mobileCtxAuthSession  = "mobile_auth_session"
+	mobileRequestIDHeader = "X-Request-ID"
+)
+
+// mobileErrorBody 是 v1 统一错误响应。字段直接位于顶层，便于客户端按
+// code 分流，不需要再判断后端历史包装层。
+type mobileErrorBody struct {
+	Code          string `json:"code"`
+	Message       string `json:"message"`
+	RequestID     string `json:"request_id"`
+	Retryable     bool   `json:"retryable"`
+	RetryAfterSec int    `json:"retry_after_sec,omitempty"`
+	Details       any    `json:"details,omitempty"`
+}
+
+// mobileRequestIDMiddleware 为每个 v1 请求绑定可追踪的请求 ID。
+// 合法客户端值会沿用（便于 App 与服务端日志对齐），非法或过长则由服务器
+// 重新生成；该值仅用于诊断，绝不参与鉴权。
+func mobileRequestIDMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		id := strings.TrimSpace(c.GetHeader(mobileRequestIDHeader))
+		if !validRequestID(id) {
+			id = uuid.NewString()
+		}
+		c.Set(mobileCtxRequestID, id)
+		c.Header(mobileRequestIDHeader, id)
+		c.Next()
+	}
+}
+
+func validRequestID(id string) bool {
+	if len(id) < 8 || len(id) > 128 {
+		return false
+	}
+	for _, r := range id {
+		if r > unicode.MaxASCII {
+			return false
+		}
+		if unicode.IsLetter(r) || unicode.IsDigit(r) {
+			continue
+		}
+		switch r {
+		case '-', '_', '.', ':':
+			continue
+		default:
+			return false
+		}
+	}
+	return true
+}
+
+func currentMobileRequestID(c *gin.Context) string {
+	if c == nil {
+		return ""
+	}
+	if v, ok := c.Get(mobileCtxRequestID); ok {
+		if s, ok := v.(string); ok && s != "" {
+			return s
+		}
+	}
+	return ""
+}
+
+// writeMobileError 输出统一错误体。request_id 缺失时现场生成，保证所有
+// v1 错误都可用于对账，而不是只在注册了中间件的路由上才有。
+func writeMobileError(c *gin.Context, status int, code, message string, retryable bool, retryAfterSec int) {
+	requestID := currentMobileRequestID(c)
+	if requestID == "" {
+		requestID = uuid.NewString()
+		c.Header(mobileRequestIDHeader, requestID)
+	}
+	if retryAfterSec > 0 {
+		c.Header("Retry-After", strconv.Itoa(retryAfterSec))
+	}
+	c.AbortWithStatusJSON(status, mobileErrorBody{
+		Code:          code,
+		Message:       message,
+		RequestID:     requestID,
+		Retryable:     retryable,
+		RetryAfterSec: retryAfterSec,
+	})
+}
+
+// mobileRateLimit 与旧端点共用 RateLimiter，但返回 v1 错误契约和 Retry-After。
+func mobileRateLimit(limiter *middleware.RateLimiter) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if !limiter.Allow(c.ClientIP()) {
+			writeMobileError(c, http.StatusTooManyRequests, mobileCodeRateLimited,
+				"too many requests, please try again later", true, 60)
+			return
+		}
+		c.Next()
+	}
+}

internal/handler/mobile_routes.go

@@ -0,0 +1,81 @@
+package handler
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/middleware"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+// registerMobileRoutes 挂载 /api/v1 移动端稳定契约。
+//
+// 既有 /api 与 Emby 入口保持不变；v1 只做适配和会话语义补强，不复制媒体
+// 或书源业务逻辑。
+func registerMobileRoutes(api *gin.RouterGroup, svc *service.Container, log *zap.Logger) {
+	if svc == nil || svc.ServerIdentity == nil || svc.AuthSessions == nil {
+		// 最小容器（例如旧测试桩）没有身份/会话服务时，不暴露不可用的 v1。
+		return
+	}
+	wireAuthSessionValidator(svc)
+
+	v1 := api.Group("/v1")
+	v1.Use(mobileRequestIDMiddleware())
+
+	v1.GET("/server-info", mobileServerInfoHandler(svc, log))
+
+	authLimiter := middleware.NewRateLimiter(30, time.Minute)
+	v1.POST("/auth/login", mobileRateLimit(authLimiter), mobileLoginHandler(svc, log))
+	v1.POST("/auth/refresh", mobileRefreshHandler(svc, log))
+
+	authed := v1.Group("/auth")
+	{
+		authed.GET("/session", mobileAuthRequired(svc), mobileSessionHandler(svc))
+		authed.POST("/logout", mobileLogoutAuthRequired(svc), mobileLogoutHandler(svc))
+	}
+}
+
+// wireAuthSessionValidator 让旧 /api 中间件也能校验新令牌的 sid。
+// service 层错误在这里映射为 middleware 的两个哨兵，避免包依赖反转。
+func wireAuthSessionValidator(svc *service.Container) {
+	middleware.SetSessionValidator(func(ctx context.Context, sessionID, userID string) error {
+		if svc == nil || svc.AuthSessions == nil {
+			return nil
+		}
+		_, err := svc.AuthSessions.Validate(ctx, sessionID, userID)
+		if err == nil {
+			return nil
+		}
+		if errors.Is(err, service.ErrAuthSessionRevoked) ||
+			errors.Is(err, service.ErrAuthSessionExpired) ||
+			errors.Is(err, service.ErrAuthSessionRequired) {
+			return middleware.ErrSessionRevoked
+		}
+		return fmt.Errorf("%w: %v", middleware.ErrSessionUnavailable, err)
+	})
+}
+
+func mobileServerInfoHandler(svc *service.Container, log *zap.Logger) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		ctx, cancel := context.WithTimeout(c.Request.Context(), 5*time.Second)
+		defer cancel()
+		info, err := svc.ServerIdentity.Info(ctx, service.CurrentServerCapabilities(svc))
+		if err != nil {
+			if log != nil {
+				log.Warn("mobile server info failed", zap.Error(err))
+			}
+			writeMobileError(c, http.StatusServiceUnavailable, mobileCodeServiceUnavailable,
+				"server identity temporarily unavailable", true, 2)
+			return
+		}
+		// 身份信息随配置变化且不应被中间缓存：同一地址可能切换部署实例。
+		c.Header("Cache-Control", "no-store")
+		c.JSON(http.StatusOK, info)
+	}
+}

internal/handler/playback_extra.go

@@ -51,11 +51,53 @@ func playbackInfoHandler(svc *service.Container) gin.HandlerFunc {
 			// 远程 Emby 挂载没有本地文件，不能提供转码地址。STRM 默认直连，直连失败时可走 HLS。
 			hlsURL = ""
 		}
-		c.JSON(http.StatusOK, gin.H{
+		// 起播路径原本还要各发一次 /playback/{id}/resume 和
+		// /media/{id}/subtitles。把这两份数据并进播放地址响应后，移动端起播
+		// 只剩一个请求 —— 跨境链路上每多一条连接就多一次 DNS/TLS 建连，
+		// 实测单次建连可到数秒。老客户端不读这两个字段，行为不变。
+		uid, _ := c.Get(middleware.CtxUserID)
+		resumePayload := gin.H{"position_ms": int64(0), "duration_ms": int64(0), "completed": false}
+		if svc.Playback != nil {
+			if row, err := svc.Playback.GetProgress(c.Request.Context(), toString(uid), m.ID); err == nil && row != nil {
+				resumePayload = gin.H{
+					"position_ms": row.PositionMs,
+					"duration_ms": row.DurationMs,
+					"completed":   row.Completed,
+				}
+			}
+		}
+		// 直连播放只需要外挂字幕；内嵌字幕由播放器从容器里解。
+		subtitles := []service.SubtitleTrack{}
+		if svc.Subtitle != nil && !(svc.EmbyRemote != nil && service.IsEmbyRemoteID(m.ID)) {
+			if discovered, err := svc.Subtitle.DiscoverExternalOnly(c.Request.Context(), m.ID); err == nil && discovered != nil {
+				subtitles = discovered
+			}
+		}
+		// 能在服务端换链就把最终直链一并返回：客户端直接连 CDN，省掉
+		// /api/stream 的 302 往返。跨境/高延迟链路上，这一跳等于一次完整的
+		// DNS + TCP + TLS，实测能到数秒，正好压在起播关键路径上。
+		// 换链失败、本地文件或需要服务端加头的网盘保持原样，客户端仍走
+		// stream_url 跳转，行为与改动前一致。
+		directURL, hasDirectURL := "", false
+		if svc.Stream != nil {
+			// `?refresh=1`：客户端手上的直链已失效（CDN 403），要求丢掉缓存
+			// 重新换链，别把同一条死链再发一次。
+			if strings.EqualFold(strings.TrimSpace(c.Query("refresh")), "1") {
+				service.InvalidateMediaLinkCache(m)
+			}
+			directURL, hasDirectURL = svc.Stream.ResolveDirectPlayURL(c.Request, m)
+		}
+		payload := gin.H{
 			"media":      m,
 			"stream_url": "/api/stream/" + m.ID + "?token=" + url.QueryEscape(token) + profileQuery,
 			"hls_url":    hlsURL,
-		})
+			"resume":     resumePayload,
+			"subtitles":  subtitles,
+		}
+		if hasDirectURL {
+			payload["direct_url"] = directURL
+		}
+		c.JSON(http.StatusOK, payload)
 	}
 }
 

internal/handler/playback_extra_test.go

@@ -22,6 +22,7 @@ import (
 	"github.com/truewhile/MeBox/internal/model"
 	"github.com/truewhile/MeBox/internal/repository"
 	"github.com/truewhile/MeBox/internal/service"
+	"github.com/truewhile/MeBox/internal/service/cloud"
 )
 
 func TestExternalURLUsesMediaScopedPlaybackToken(t *testing.T) {
@@ -435,6 +436,10 @@ func TestPlaybackInfoForSTRMMediaIncludesHLS(t *testing.T) {
 	var payload struct {
 		StreamURL string `json:"stream_url"`
 		HlsURL    string `json:"hls_url"`
+		// 移动端起播只打这一个接口：resume / subtitles 必须始终存在，
+		// 哪怕是默认值，否则客户端会退回额外两个请求。
+		Resume     *struct{ PositionMs int64 `json:"position_ms"` } `json:"resume"`
+		Subtitles  *[]struct{}                                     `json:"subtitles"`
 	}
 	if err := json.Unmarshal(w.Body.Bytes(), &payload); err != nil {
 		t.Fatalf("decode: %v", err)
@@ -445,6 +450,66 @@ func TestPlaybackInfoForSTRMMediaIncludesHLS(t *testing.T) {
 	if payload.HlsURL == "" || !strings.Contains(payload.HlsURL, "/api/hls/media-1/") {
 		t.Fatalf("expected strm hls_url, got %q", payload.HlsURL)
 	}
+	if payload.Resume == nil {
+		t.Fatalf("playback info must always carry resume (got body=%s)", w.Body.String())
+	}
+	if payload.Subtitles == nil {
+		t.Fatalf("playback info must always carry subtitles (got body=%s)", w.Body.String())
+	}
+}
+
+// 服务端能换到最终直链时，播放地址响应要把直链一并给客户端：移动端起播就能
+// 跳过 /api/stream 的 302 往返（跨境链路上等于一次完整 DNS+TCP+TLS）。
+func TestPlaybackInfoCarriesPrefetchedDirectURL(t *testing.T) {
+	router, svc, secret := newPlaybackScopeTestRouter(t)
+	loginToken := signedTestToken(t, secret)
+	const direct = "https://cdnfhnfile.115cdn.net/637b/Movie.mkv?t=1&k=sig"
+	var gotUA string
+	svc.Stream.SetStrmPlayTargetResolver(func(_ context.Context, _, userAgent string) (*service.StrmPlayResult, error) {
+		gotUA = userAgent
+		return &service.StrmPlayResult{
+			RedirectURL: direct,
+			Link:        &cloud.DirectLink{URL: direct, Headers: map[string]string{"User-Agent": userAgent}},
+		}, nil
+	})
+	if err := svc.Repo.DB.Create(&model.Media{
+		Base:        model.Base{ID: "media-direct"},
+		LibraryID:   "lib-1",
+		Title:       "Direct",
+		Path:        "cloud://cloud115/Movie.mkv",
+		Container:   "strm",
+		DurationSec: 3600,
+		STRMURL:     "/api/strm/play/cloud115/video.mkv?acct=a1&pickcode=pc1",
+	}).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	req := httptest.NewRequest(http.MethodGet, "http://nas.local/api/playback/media-direct/info", nil)
+	req.Header.Set("Authorization", "Bearer "+loginToken)
+	req.Header.Set("User-Agent", "MeBox-Android/0.1.0")
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status = %d body=%s", w.Code, w.Body.String())
+	}
+	var payload struct {
+		DirectURL string `json:"direct_url"`
+		StreamURL string `json:"stream_url"`
+	}
+	if err := json.Unmarshal(w.Body.Bytes(), &payload); err != nil {
+		t.Fatalf("decode: %v", err)
+	}
+	if payload.DirectURL != direct {
+		t.Fatalf("direct_url = %q, want %q (body=%s)", payload.DirectURL, direct, w.Body.String())
+	}
+	if !strings.Contains(payload.StreamURL, "/api/stream/media-direct") {
+		t.Fatalf("stream_url must stay as the fallback, got %q", payload.StreamURL)
+	}
+	// 115 直链绑定换取时的 UA：预置直链必须按播放器的 UA 换，否则播放会 403。
+	if gotUA != "MeBox-Android/0.1.0" {
+		t.Fatalf("resolver UA = %q, want the client UA", gotUA)
+	}
 }
 
 func TestSubtitleListOnlyProbesEmbeddedTracksForHLS(t *testing.T) {

internal/handler/playback_segments.go

@@ -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

internal/handler/reader_audio_range_test.go

@@ -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()
+}

internal/handler/reader_content_options_test.go

@@ -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)
+			}
+		})
+	}
+}

internal/handler/reader_media_test.go

@@ -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)
+	}
+}

internal/handler/routes_admin.go

@@ -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)
 
@@ -50,6 +53,7 @@ func registerAdminStrmRoutes(admin *gin.RouterGroup, svc *service.Container) {
 	// Emby 挂载管理：远程 Emby 媒体库挂载（账号复用 strm/accounts）
 	admin.GET("/emby/accounts/:id/views", embyAccountViewsHandler(svc))
 	admin.POST("/emby/accounts/:id/full-mount", fullMountEmbyAccountHandler(svc))
+	admin.PUT("/emby/accounts/:id/mounts/enabled", setEmbyMountsEnabledHandler(svc))
 	admin.GET("/emby/mounts", listEmbyMountsHandler(svc))
 	admin.POST("/emby/mounts", createEmbyMountsHandler(svc))
 	admin.PUT("/emby/mounts/reorder", reorderEmbyMountsHandler(svc))
@@ -142,6 +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))
 }

internal/handler/routes_authenticated_core.go

@@ -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))

internal/handler/routes_authenticated_extras.go

@@ -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))

internal/handler/routes_authenticated_features.go

@@ -21,6 +21,8 @@ func registerAuthedDLNARoutes(authed *gin.RouterGroup, svc *service.Container) {
 }
 
 func registerAuthedRealtimeRoutes(authed *gin.RouterGroup, svc *service.Container) {
-	authed.GET("/ws", wsHandler(svc))
-	authed.GET("/events", sseHandler(svc))
+	// These streams carry operator tasks, including filesystem paths and scan
+	// errors. Their payloads are not scoped to an individual user's libraries.
+	authed.GET("/ws", middleware.AdminRequired(), wsHandler(svc))
+	authed.GET("/events", middleware.AdminRequired(), sseHandler(svc))
 }

internal/handler/streaming.go

@@ -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")

internal/handler/watch_history.go

@@ -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)
 			}

internal/handler/watch_history_test.go

@@ -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)
+			}
+		}
+	}
+}

internal/handler/ws.go

@@ -1,9 +1,7 @@
 // Package handler — WebSocket endpoint.
 //
-// Clients connect to /api/ws?token=... (the token is the same JWT used for
-// REST calls). The first message they send is a JSON {"action":"subscribe",
-// "topics":["scan","scrape","transcode"]}. Subsequent server-pushed events
-// arrive as {"topic":"...","payload":{...}}.
+// Administrators connect to /api/ws?token=... with their REST access token.
+// Operator events arrive as {"topic":"...","payload":{...}}.
 package handler
 
 import (
@@ -52,8 +50,11 @@ func wsHandler(svc *service.Container) gin.HandlerFunc {
 		sub := svc.WSHub.Subscribe(id, nil)
 		defer svc.WSHub.Unsubscribe(id)
 
-		// Reader: accept ping + subscription updates.
+		// Reading processes WebSocket control frames and detects disconnects.
+		done := make(chan struct{})
+		conn.SetReadLimit(64 << 10)
 		go func() {
+			defer close(done)
 			for {
 				if _, _, err := conn.NextReader(); err != nil {
 					_ = conn.Close()
@@ -67,6 +68,8 @@ func wsHandler(svc *service.Container) gin.HandlerFunc {
 		defer ticker.Stop()
 		for {
 			select {
+			case <-done:
+				return
 			case ev, ok := <-sub.Out:
 				if !ok {
 					return

internal/handler/ws_test.go

@@ -0,0 +1,93 @@
+package handler
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+	"github.com/gorilla/websocket"
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/middleware"
+	"github.com/truewhile/MeBox/internal/service"
+)
+
+func realtimeTestRouter(hub *service.Hub) *gin.Engine {
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	authed := router.Group("/api")
+	authed.Use(middleware.AuthRequired("realtime-test"))
+	registerAuthedRealtimeRoutes(authed, &service.Container{WSHub: hub})
+	return router
+}
+
+func realtimeTestToken(t *testing.T, role string) string {
+	t.Helper()
+	token, err := jwt.NewWithClaims(jwt.SigningMethodHS256, middleware.Claims{
+		UserID: "viewer", Role: role,
+		RegisteredClaims: jwt.RegisteredClaims{ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Hour))},
+	}).SignedString([]byte("realtime-test"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	return token
+}
+
+func TestRealtimeStreamsRejectOrdinaryUsers(t *testing.T) {
+	router := realtimeTestRouter(nil)
+	for _, path := range []string{"/api/ws", "/api/events"} {
+		for _, role := range []string{"", "user"} {
+			req := httptest.NewRequest(http.MethodGet, path, nil)
+			want := http.StatusUnauthorized
+			if role != "" {
+				req.Header.Set("Authorization", "Bearer "+realtimeTestToken(t, role))
+				want = http.StatusForbidden
+			}
+			recorder := httptest.NewRecorder()
+			router.ServeHTTP(recorder, req)
+			if recorder.Code != want {
+				t.Fatalf("%s role %q: status %d, want %d", path, role, recorder.Code, want)
+			}
+		}
+	}
+}
+
+func TestAdminWebSocketReceivesTaskEvents(t *testing.T) {
+	hub := service.NewHub(zap.NewNop())
+	go hub.Run()
+	defer hub.Stop()
+	server := httptest.NewServer(realtimeTestRouter(hub))
+	defer server.Close()
+	url := "ws" + strings.TrimPrefix(server.URL, "http") + "/api/ws?token=" + realtimeTestToken(t, "admin")
+	conn, _, err := websocket.DefaultDialer.Dial(url, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer conn.Close()
+	stop := make(chan struct{})
+	defer close(stop)
+	go func() {
+		ticker := time.NewTicker(10 * time.Millisecond)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-stop:
+				return
+			case <-ticker.C:
+				hub.Publish("task", service.BackgroundTask{ID: "task-1", SourcePath: "/media/private"})
+			}
+		}
+	}()
+	_ = conn.SetReadDeadline(time.Now().Add(2 * time.Second))
+	var event service.Event
+	if err := conn.ReadJSON(&event); err != nil {
+		t.Fatal(err)
+	}
+	if event.Topic != "task" || event.Payload.(map[string]any)["source_path"] != "/media/private" {
+		t.Fatalf("event = %#v", event)
+	}
+}

internal/helper/http.go

@@ -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.

internal/middleware/auth.go

@@ -17,6 +17,8 @@ type Claims struct {
 	Tier    string `json:"tier,omitempty"`
 	Purpose string `json:"purpose,omitempty"`
 	MediaID string `json:"media_id,omitempty"`
+	// Sid 是设备认证会话 ID；旧令牌为空，继续走兼容路径。
+	Sid string `json:"sid,omitempty"`
 	jwt.RegisteredClaims
 }
 
@@ -44,6 +46,19 @@ func AuthRequired(secret string) gin.HandlerFunc {
 			c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"code": 40304, "message": "token scope denied"})
 			return
 		}
+		// 新协议令牌携带 sid：旧 API 也必须检查会话是否已被撤销，否则
+		// 设备被踢后仍能用未过期的 JWT 访问 /api/*。
+		if sid := strings.TrimSpace(claims.Sid); sid != "" {
+			if err := ValidateAuthSession(c.Request.Context(), sid, claims.UserID); err != nil {
+				if errors.Is(err, ErrSessionUnavailable) {
+					c.AbortWithStatusJSON(http.StatusServiceUnavailable, gin.H{"code": 50303, "message": "auth session unavailable"})
+					return
+				}
+				c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"code": 40104, "message": "auth session revoked"})
+				return
+			}
+			c.Set(CtxAuthSessionID, sid)
+		}
 		syncAccessTokenCookie(c, raw, claims)
 		c.Set(CtxUserID, claims.UserID)
 		c.Set(CtxUserRole, claims.Role)
@@ -151,3 +166,8 @@ func extractToken(c *gin.Context) string {
 	}
 	return ""
 }
+
+// ExtractToken 暴露令牌提取逻辑给需要自定义错误契约的移动端中间件。
+func ExtractToken(c *gin.Context) string {
+	return extractToken(c)
+}

internal/middleware/auth_session.go

@@ -0,0 +1,48 @@
+package middleware
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"sync"
+)
+
+// 会话校验错误。service 层把自己的错误映射到这两个哨兵，避免 middleware
+// 依赖 service 包（auth 服务已经依赖 middleware 的上下文键）。
+var (
+	// ErrSessionRevoked 表示会话已撤销、已过期或不存在：客户端应重新登录。
+	ErrSessionRevoked = errors.New("auth session revoked")
+	// ErrSessionUnavailable 表示暂时无法完成会话校验：客户端应稍后重试。
+	ErrSessionUnavailable = errors.New("auth session unavailable")
+)
+
+// SessionValidator 校验认证会话是否仍属于该用户。
+type SessionValidator func(ctx context.Context, sessionID, userID string) error
+
+var (
+	sessionValidatorMu sync.RWMutex
+	sessionValidator   SessionValidator
+)
+
+// SetSessionValidator 注册全局会话校验器；传 nil 表示关闭校验（旧装配路径）。
+func SetSessionValidator(fn SessionValidator) {
+	sessionValidatorMu.Lock()
+	defer sessionValidatorMu.Unlock()
+	sessionValidator = fn
+}
+
+// ValidateAuthSession 使用已注册的校验器检查 sid。未注册校验器时放行，
+// 以保持旧测试和嵌入式调用的兼容行为。
+func ValidateAuthSession(ctx context.Context, sessionID, userID string) error {
+	sessionID = strings.TrimSpace(sessionID)
+	if sessionID == "" {
+		return nil
+	}
+	sessionValidatorMu.RLock()
+	fn := sessionValidator
+	sessionValidatorMu.RUnlock()
+	if fn == nil {
+		return nil
+	}
+	return fn(ctx, sessionID, userID)
+}

internal/middleware/gzip.go

@@ -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",
 }

internal/middleware/gzip_test.go

@@ -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()
 

internal/middleware/middleware.go

@@ -9,6 +9,8 @@ const (
 	CtxUserTier     = "ctx_user_tier"
 	CtxTokenPurpose = "ctx_token_purpose"
 	CtxTokenMediaID = "ctx_token_media_id"
+	// CtxAuthSessionID 保存已校验的设备认证会话 ID（新协议令牌才有）。
+	CtxAuthSessionID = "ctx_auth_session_id"
 
 	// AccessTokenCookieName carries the web access token for browser-managed
 	// resource requests such as <img>, which cannot attach Authorization.

internal/model/auth_session.go

@@ -0,0 +1,49 @@
+package model
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+// AuthSession 是可撤销的设备认证会话。
+//
+// 会话与刷新令牌的关系是 1:N：一次登录创建一个会话，之后每次轮换刷新
+// 令牌都继续归属同一会话。访问令牌通过 JWT 的 sid 字段引用会话，因此
+// 服务端可以在 JWT 尚未过期时立即撤销某台设备的访问能力。
+//
+// 旧客户端没有会话关联（sid 为空），继续走既有兼容路径；本模型不强制
+// 把历史刷新令牌绑定到任何设备。
+type AuthSession struct {
+	ID            string     `gorm:"primaryKey;size:36" json:"id"`
+	UserID        string     `gorm:"index;size:36;not null" json:"user_id"`
+	DeviceID      string     `gorm:"index:idx_auth_session_device,priority:1;size:128;not null" json:"device_id"`
+	DeviceName    string     `gorm:"size:128" json:"device_name,omitempty"`
+	ClientName    string     `gorm:"size:64" json:"client_name,omitempty"`
+	ClientVersion string     `gorm:"size:64" json:"client_version,omitempty"`
+	Revoked       bool       `gorm:"not null;default:false" json:"revoked"`
+	RevokedAt     *time.Time `json:"revoked_at,omitempty"`
+	LastUsedAt    time.Time  `json:"last_used_at"`
+	ExpiresAt     time.Time  `gorm:"index" json:"expires_at"`
+	CreatedAt     time.Time  `json:"created_at"`
+	UpdatedAt     time.Time  `json:"updated_at"`
+}
+
+// BeforeCreate 生成 UUID 主键。
+func (s *AuthSession) BeforeCreate(_ *gorm.DB) error {
+	if s.ID == "" {
+		s.ID = uuid.NewString()
+	}
+	return nil
+}
+
+// IsExpired 判断会话是否超过最长有效期。
+func (s *AuthSession) IsExpired() bool {
+	return s != nil && !s.ExpiresAt.IsZero() && time.Now().After(s.ExpiresAt)
+}
+
+// IsValid 判断会话当前是否可继续使用。
+func (s *AuthSession) IsValid() bool {
+	return s != nil && !s.Revoked && !s.IsExpired()
+}

internal/model/background_task.go

@@ -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"`
+}

internal/model/cloud_download.go

@@ -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"`
+}

internal/model/library_media.go

@@ -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

internal/model/model.go

@@ -49,6 +49,7 @@ func AllModels() []interface{} {
 		&APIConfig{},
 		&UserPermission{},
 		&RefreshToken{},
+		&AuthSession{},
 		&PlayProfile{},
 		&RegistrationCode{},
 		&SignIn{},
@@ -59,7 +60,9 @@ func AllModels() []interface{} {
 		&StrmDownloadTask{},
 		&StrmUploadTask{},
 		&StrmDirCache{},
+		&CloudDownloadTask{},
 		&ScrapeTask{},
+		&BackgroundTaskRecord{},
 		&EmbyMount{},
 		&ReaderBookSource{},
 		&ReaderSourceState{},

internal/model/reader.go

@@ -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

internal/model/refresh_token.go

@@ -11,12 +11,14 @@ import (
 // RefreshToken 用于双令牌认证机制中的刷新令牌。
 // 存储时使用 SHA256 哈希，原始令牌不存储。
 type RefreshToken struct {
-	ID        string    `gorm:"primaryKey;size:36" json:"id"`
-	UserID    string    `gorm:"index;size:36;not null" json:"user_id"`
-	TokenHash string    `gorm:"uniqueIndex;size:128;not null" json:"-"`
-	ExpiresAt time.Time `gorm:"index" json:"expires_at"`
-	CreatedAt time.Time `json:"created_at"`
-	Revoked   bool      `gorm:"default:false" json:"revoked"`
+	ID        string `gorm:"primaryKey;size:36" json:"id"`
+	UserID    string `gorm:"index;size:36;not null" json:"user_id"`
+	TokenHash string `gorm:"uniqueIndex;size:128;not null" json:"-"`
+	// AuthSessionID 关联移动端设备会话。旧数据为空，继续按既有兼容路径使用。
+	AuthSessionID string    `gorm:"index;size:36" json:"auth_session_id,omitempty"`
+	ExpiresAt     time.Time `gorm:"index" json:"expires_at"`
+	CreatedAt     time.Time `json:"created_at"`
+	Revoked       bool      `gorm:"default:false" json:"revoked"`
 }
 
 // BeforeCreate 生成 UUID。

internal/repository/auth_session_repository.go

@@ -0,0 +1,101 @@
+package repository
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"gorm.io/gorm"
+
+	"github.com/truewhile/MeBox/internal/model"
+)
+
+// AuthSessionRepository persists model.AuthSession records.
+type AuthSessionRepository struct{ db *gorm.DB }
+
+// Create inserts a new authentication session.
+func (r *AuthSessionRepository) Create(ctx context.Context, s *model.AuthSession) error {
+	return withSQLiteBusyRetry(ctx, func() error {
+		return r.db.WithContext(ctx).Create(s).Error
+	})
+}
+
+// FindByID returns the session or (nil, nil) when absent.
+func (r *AuthSessionRepository) FindByID(ctx context.Context, id string) (*model.AuthSession, error) {
+	if id == "" {
+		return nil, nil
+	}
+	var s model.AuthSession
+	err := withSQLiteBusyRetry(ctx, func() error {
+		s = model.AuthSession{}
+		return r.db.WithContext(ctx).Where("id = ?", id).First(&s).Error
+	})
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &s, nil
+}
+
+// TouchLastUsed 更新会话最近使用时间。
+func (r *AuthSessionRepository) TouchLastUsed(ctx context.Context, id string, at time.Time) error {
+	return withSQLiteBusyRetry(ctx, func() error {
+		return r.db.WithContext(ctx).Model(&model.AuthSession{}).
+			Where("id = ? AND revoked = ?", id, false).
+			Update("last_used_at", at).Error
+	})
+}
+
+// Revoke 撤销单个会话（幂等）。
+func (r *AuthSessionRepository) Revoke(ctx context.Context, id string, at time.Time) error {
+	return withSQLiteBusyRetry(ctx, func() error {
+		return r.db.WithContext(ctx).Model(&model.AuthSession{}).
+			Where("id = ? AND revoked = ?", id, false).
+			Updates(map[string]any{"revoked": true, "revoked_at": at}).Error
+	})
+}
+
+// RevokeByUser 撤销某用户的全部会话（幂等）。
+func (r *AuthSessionRepository) RevokeByUser(ctx context.Context, userID string, at time.Time) error {
+	return withSQLiteBusyRetry(ctx, func() error {
+		return r.db.WithContext(ctx).Model(&model.AuthSession{}).
+			Where("user_id = ? AND revoked = ?", userID, false).
+			Updates(map[string]any{"revoked": true, "revoked_at": at}).Error
+	})
+}
+
+// RevokeByDevice 撤销某用户某设备关联的全部会话（幂等）。
+func (r *AuthSessionRepository) RevokeByDevice(ctx context.Context, userID, deviceID string, at time.Time) error {
+	return withSQLiteBusyRetry(ctx, func() error {
+		return r.db.WithContext(ctx).Model(&model.AuthSession{}).
+			Where("user_id = ? AND device_id = ? AND revoked = ?", userID, deviceID, false).
+			Updates(map[string]any{"revoked": true, "revoked_at": at}).Error
+	})
+}
+
+// ListActiveByUser 返回某用户当前有效（未撤销、未过期）的会话。
+func (r *AuthSessionRepository) ListActiveByUser(ctx context.Context, userID string) ([]model.AuthSession, error) {
+	var rows []model.AuthSession
+	err := withSQLiteBusyRetry(ctx, func() error {
+		rows = nil
+		return r.db.WithContext(ctx).
+			Where("user_id = ? AND revoked = ? AND expires_at > ?", userID, false, time.Now()).
+			Order("last_used_at desc, created_at desc").
+			Find(&rows).Error
+	})
+	return rows, err
+}
+
+// ListByDevice 返回某用户某设备的全部会话，用于踢出设备时逐个撤销。
+func (r *AuthSessionRepository) ListByDevice(ctx context.Context, userID, deviceID string) ([]model.AuthSession, error) {
+	var rows []model.AuthSession
+	err := withSQLiteBusyRetry(ctx, func() error {
+		rows = nil
+		return r.db.WithContext(ctx).
+			Where("user_id = ? AND device_id = ?", userID, deviceID).
+			Find(&rows).Error
+	})
+	return rows, err
+}

internal/repository/cloud_download_repository.go

@@ -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
+}

internal/repository/emby_mount_repository.go

@@ -3,6 +3,7 @@ package repository
 import (
 	"context"
 	"errors"
+	"strings"
 	"time"
 
 	"gorm.io/gorm"
@@ -89,6 +90,22 @@ func (r *EmbyMountRepository) SetSortOrder(ctx context.Context, ids []string) er
 	})
 }
 
+// SetEnabledByAccountID 批量设置账号下全部挂载的启用状态。
+func (r *EmbyMountRepository) SetEnabledByAccountID(ctx context.Context, accountID string, enabled bool) (int64, error) {
+	var affected int64
+	if strings.TrimSpace(accountID) == "" {
+		return 0, nil
+	}
+	err := withSQLiteBusyRetry(ctx, func() error {
+		res := r.db.WithContext(ctx).Model(&model.EmbyMount{}).
+			Where("account_id = ?", accountID).
+			Updates(map[string]any{"enabled": enabled, "updated_at": time.Now()})
+		affected = res.RowsAffected
+		return res.Error
+	})
+	return affected, err
+}
+
 func (r *EmbyMountRepository) CountByAccountID(ctx context.Context, accountID string) (int64, error) {
 	var count int64
 	err := r.db.WithContext(ctx).Model(&model.EmbyMount{}).Where("account_id = ?", accountID).Count(&count).Error

internal/repository/library_repository.go

@@ -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

internal/repository/media_repository.go

@@ -63,38 +63,38 @@ type MediaQueryFilter struct {
 
 func applyMediaQueryFilter(q *gorm.DB, filter MediaQueryFilter) *gorm.DB {
 	if !filter.IncludeNSFW {
-		q = q.Where("nsfw = ?", false)
+		q = q.Where("media.nsfw = ?", false)
 	}
 	if len(filter.HiddenLibraryIDs) > 0 {
-		q = q.Where("library_id NOT IN ?", filter.HiddenLibraryIDs)
+		q = q.Where("media.library_id NOT IN ?", filter.HiddenLibraryIDs)
 	}
 	if len(filter.AllowedLibraryIDs) > 0 {
-		q = q.Where("library_id IN ?", filter.AllowedLibraryIDs)
+		q = q.Where("media.library_id IN ?", filter.AllowedLibraryIDs)
 	}
 	if libraryID := strings.TrimSpace(filter.LibraryID); libraryID != "" {
-		q = q.Where("library_id = ?", libraryID)
+		q = q.Where("media.library_id = ?", libraryID)
 	}
 	if seriesID := strings.TrimSpace(filter.SeriesID); seriesID != "" {
-		q = q.Where("series_id = ?", seriesID)
+		q = q.Where("media.series_id = ?", seriesID)
 	}
 	if len(filter.Genres) > 0 {
 		q = q.Where(genreMatchClause(filter.Genres), genreMatchArgs(filter.Genres)...)
 	}
 	if filter.YearMin > 0 {
-		q = q.Where("year >= ?", filter.YearMin)
+		q = q.Where("media.year >= ?", filter.YearMin)
 	}
 	if filter.YearMax > 0 {
-		q = q.Where("year <= ?", filter.YearMax)
+		q = q.Where("media.year <= ?", filter.YearMax)
 	}
 	if filter.RatingMin > 0 {
-		q = q.Where("rating >= ?", filter.RatingMin)
+		q = q.Where("media.rating >= ?", filter.RatingMin)
 	}
 	if filter.UnwatchedOnly {
 		userID := strings.TrimSpace(filter.UnwatchedUserID)
 		// 没有用户上下文时忽略该条件：否则会把整个库筛成空，看起来像「坏了」。
 		if userID != "" {
 			q = q.Where(
-				"id NOT IN (SELECT media_id FROM playback_histories WHERE user_id = ? AND completed = ?)",
+				"media.id NOT IN (SELECT media_id FROM playback_histories WHERE user_id = ? AND completed = ?)",
 				userID, true,
 			)
 		}
@@ -113,7 +113,7 @@ func applyMediaQueryFilter(q *gorm.DB, filter MediaQueryFilter) *gorm.DB {
 func genreMatchClause(genres []string) string {
 	clauses := make([]string, 0, len(genres))
 	for range genres {
-		clauses = append(clauses, "',' || REPLACE(REPLACE(TRIM(genres), ' ', ''), '，', ',') || ',' LIKE ?")
+		clauses = append(clauses, "',' || REPLACE(REPLACE(TRIM(media.genres), ' ', ''), '，', ',') || ',' LIKE ?")
 	}
 	return "(" + strings.Join(clauses, " OR ") + ")"
 }
@@ -122,7 +122,7 @@ func genreMatchClause(genres []string) string {
 //
 // 必须与 genreMatchClause 的列端处理完全对称：
 //   - TRIM                   → TrimSpace
-//   - REPLACE(…, ' ', '')    → ReplaceAll(…, " ", "")   ← 多词类型（如 "Science Fiction"）
+//   - REPLACE(…, ' ', ”)    → ReplaceAll(…, " ", "")   ← 多词类型（如 "Science Fiction"）
 //   - REPLACE(…, '，', ',')  → ReplaceAll(…, "，", ",")
 func genreMatchArgs(genres []string) []any {
 	args := make([]any, 0, len(genres))
@@ -178,14 +178,6 @@ func (r *MediaRepository) YearRange(ctx context.Context, filter MediaQueryFilter
 	return min, max, nil
 }
 
-func (r *MediaRepository) indexMediaBestEffort(ctx context.Context, media model.Media) {
-	backend, ok := r.searchBackend.(MediaSearchSyncBackend)
-	if !ok {
-		return
-	}
-	_ = backend.IndexMedia(ctx, []model.Media{media})
-}
-
 // FindByID returns the media row or (nil, nil).
 func (r *MediaRepository) FindByID(ctx context.Context, id string) (*model.Media, error) {
 	var m model.Media
@@ -245,10 +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 {

internal/repository/media_repository_upsert.go

@@ -5,8 +5,10 @@ import (
 	"errors"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
 
 	"github.com/truewhile/MeBox/internal/model"
 )
@@ -95,12 +97,34 @@ func (r *MediaRepository) UpsertBatchWithAliases(ctx context.Context, items []Me
 
 // indexByIDBestEffort 在事务提交后按 ID 回读最新行并同步搜索索引。
 func (r *MediaRepository) indexByIDBestEffort(ctx context.Context, ids []string) {
+	backend, ok := r.searchBackend.(MediaSearchSyncBackend)
+	if !ok {
+		return
+	}
+	unique := make([]string, 0, len(ids))
+	seen := make(map[string]struct{}, len(ids))
 	for _, id := range ids {
 		if id == "" {
 			continue
 		}
-		if fresh, err := r.FindByID(ctx, id); err == nil && fresh != nil {
-			r.indexMediaBestEffort(ctx, *fresh)
+		if _, exists := seen[id]; !exists {
+			seen[id] = struct{}{}
+			unique = append(unique, id)
+		}
+	}
+	// Read committed rows and submit one bulk per bounded batch. Keep network
+	// work outside the transaction and below SQLite's parameter limit.
+	const batchSize = 500
+	for start := 0; start < len(unique); start += batchSize {
+		batch := unique[start:min(start+batchSize, len(unique))]
+		rows, err := r.ListMediaByIDs(ctx, batch)
+		if err == nil {
+			err = backend.IndexMedia(ctx, rows)
+		}
+		if err != nil {
+			// The primary write has committed; do not report a failed upsert and
+			// make scanners repeat it. Surface the separate index failure instead.
+			r.db.Logger.Error(ctx, "media saved but search index sync failed for %d items: %v", len(batch), err)
 		}
 	}
 }
@@ -140,6 +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
 }
@@ -193,14 +223,23 @@ func (r *MediaRepository) findOrCreateMediaByPath(ctx context.Context, db *gorm.
 		if m.ScrapeStatus == "" {
 			m.ScrapeStatus = "pending"
 		}
-		if createErr := db.WithContext(ctx).Create(m).Error; createErr == nil {
-			return *m, true, false, nil
-		} else if retryErr := db.WithContext(ctx).Unscoped().Where("path = ?", m.Path).First(&existing).Error; retryErr != nil {
-			return model.Media{}, false, false, createErr
-		} else {
-			// 并发插入竞态：重查已命中既有行，直接走更新分支。
-			return existing, false, false, nil
+		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)
+		if result.Error != nil {
+			return model.Media{}, false, false, result.Error
 		}
+		if result.RowsAffected > 0 {
+			return *m, true, false, nil
+		}
+		if err := db.WithContext(ctx).Unscoped().Where("path = ?", m.Path).First(&existing).Error; err != nil {
+			return model.Media{}, false, false, err
+		}
+		return existing, false, false, nil
 	}
 	if err != nil {
 		return model.Media{}, false, false, err
@@ -237,6 +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)

internal/repository/media_search_repository.go

@@ -6,6 +6,7 @@ import (
 	"unicode"
 
 	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
 
 	"github.com/truewhile/MeBox/internal/model"
 )
@@ -86,7 +87,7 @@ func (r *MediaRepository) searchFilteredFTS(ctx context.Context, query string, o
 		Joins("JOIN media_search_fts ON media_search_fts.rowid = media.rowid").
 		Where("media.deleted_at IS NULL").
 		Where("media_search_fts MATCH ?", ftsQuery)
-	q = applyQualifiedMediaQueryFilter(q, filter)
+	q = applyMediaQueryFilter(q, filter)
 	if err := q.Count(&total).Error; err != nil {
 		return nil, 0, false
 	}
@@ -122,10 +123,10 @@ func (r *MediaRepository) searchFilteredLIKE(ctx context.Context, query string,
 	if query != "" {
 		prefix := escapeLike(query) + "%"
 		exact := query
-		q = q.Order(gorm.Expr(
+		q = q.Order(clause.OrderBy{Expression: gorm.Expr(
 			"CASE WHEN title = ? THEN 0 WHEN original_name = ? THEN 1 WHEN title "+likeOp+" ? ESCAPE '\\' THEN 2 WHEN original_name "+likeOp+" ? ESCAPE '\\' THEN 3 ELSE 4 END, created_at desc",
 			exact, exact, prefix, prefix,
-		))
+		)})
 	} else {
 		q = q.Order("created_at desc")
 	}
@@ -133,22 +134,6 @@ func (r *MediaRepository) searchFilteredLIKE(ctx context.Context, query string,
 	return items, total, err
 }
 
-func applyQualifiedMediaQueryFilter(q *gorm.DB, filter MediaQueryFilter) *gorm.DB {
-	if !filter.IncludeNSFW {
-		q = q.Where("media.nsfw = ?", false)
-	}
-	if len(filter.HiddenLibraryIDs) > 0 {
-		q = q.Where("media.library_id NOT IN ?", filter.HiddenLibraryIDs)
-	}
-	if len(filter.AllowedLibraryIDs) > 0 {
-		q = q.Where("media.library_id IN ?", filter.AllowedLibraryIDs)
-	}
-	if seriesID := strings.TrimSpace(filter.SeriesID); seriesID != "" {
-		q = q.Where("media.series_id = ?", seriesID)
-	}
-	return q
-}
-
 func mediaFTSQuery(query string) string {
 	terms := mediaSearchTerms(query)
 	if len(terms) == 0 {

internal/repository/media_segment_repository.go

@@ -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

internal/repository/media_series_index.go

@@ -0,0 +1,53 @@
+package repository
+
+import (
+	"context"
+
+	"github.com/truewhile/MeBox/internal/model"
+)
+
+// MediaSeriesIndexColumns 是解析剧集归组 key 所需的全部列。
+//
+// 剧集归组（首页「最近添加」、媒体库卡片）必须看到整库每一行才能算出正确的
+// key 和集数，因此不能只用 SQL 顶端的几行。但整行扫描会把 overview、genres、
+// strm_url 这些大文本列一并读进来再丢掉：7k 行规模下驱动层的逐列 bind 占了
+// 绝大部分耗时（实测 ~60%）。这里只取归组真正用到的列，卡片代表行在选出
+// 前 N 个剧集后按 id 再补一次完整行。
+const MediaSeriesIndexColumns = "" +
+	"id, created_at, updated_at, library_id, library_root_id, series_id, " +
+	"title, original_name, path, poster_url, backdrop_url, " +
+	"year, release_date, season_num, episode_num, episode_fraction, " +
+	"tm_db_id, bangumi_id, douban_id, thetvdb_id, " +
+	"width, height, size_bytes, video_codec, audio_codec, container, nsfw"
+
+// ListMediaSeriesIndex 按 created_at 倒序返回可见媒体的「归组投影」。
+//
+// 与 SearchFiltered 的区别：
+//   - 不做 COUNT(*)（调用方不需要总数，7k 行时这一条 SQL 白跑一遍全表）；
+//   - 只 SELECT 归组所需列，避免大文本列的解码与内存拷贝。
+func (r *MediaRepository) ListMediaSeriesIndex(ctx context.Context, limit int, filter MediaQueryFilter) ([]model.Media, error) {
+	var items []model.Media
+	q := r.db.WithContext(ctx).Model(&model.Media{}).
+		Select(MediaSeriesIndexColumns).
+		Order("created_at desc")
+	q = applyMediaQueryFilter(q, filter)
+	if limit > 0 {
+		q = q.Limit(limit)
+	}
+	if err := q.Find(&items).Error; err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+// ListMediaByIDs 按 ID 批量取完整行（用于补齐剧集卡片的代表行）。
+func (r *MediaRepository) ListMediaByIDs(ctx context.Context, ids []string) ([]model.Media, error) {
+	if len(ids) == 0 {
+		return nil, nil
+	}
+	var items []model.Media
+	if err := r.db.WithContext(ctx).Where("id IN ?", ids).Find(&items).Error; err != nil {
+		return nil, err
+	}
+	return items, nil
+}

internal/repository/opensearch.go

@@ -4,8 +4,10 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
+	"net"
 	"net/http"
 	"net/url"
 	"strings"
@@ -135,14 +137,113 @@ func (b *OpenSearchMediaBackend) EnsureIndex(ctx context.Context) error {
 }
 
 func (b *OpenSearchMediaBackend) IndexMedia(ctx context.Context, rows []model.Media) error {
+	const batchSize = 500
+	var failures []error
+	for start := 0; start < len(rows); start += batchSize {
+		if err := b.indexMediaBatch(ctx, rows[start:min(start+batchSize, len(rows))]); err != nil {
+			failures = append(failures, err)
+			if ctx.Err() != nil {
+				break
+			}
+		}
+	}
+	return errors.Join(failures...)
+}
+
+type openSearchBulkResponse struct {
+	Errors bool `json:"errors"`
+	Items  []struct {
+		Index struct {
+			ID     string `json:"_id"`
+			Status int    `json:"status"`
+			Error  *struct {
+				Type string `json:"type"`
+			} `json:"error"`
+		} `json:"index"`
+	} `json:"items"`
+}
+
+func (b *OpenSearchMediaBackend) indexMediaBatch(ctx context.Context, rows []model.Media) error {
 	if len(rows) == 0 {
 		return nil
 	}
+	pending := rows
+	var failures []error
+	const attempts = 3
+	for attempt := 0; attempt < attempts; attempt++ {
+		if err := ctx.Err(); err != nil {
+			return errors.Join(append(failures, err)...)
+		}
+		if attempt > 0 {
+			timer := time.NewTimer(time.Duration(100*(1<<(attempt-1))) * time.Millisecond)
+			select {
+			case <-ctx.Done():
+				timer.Stop()
+				return errors.Join(append(failures, ctx.Err())...)
+			case <-timer.C:
+			}
+		}
+		response, err := b.submitMediaBulk(ctx, pending)
+		if err != nil {
+			if retryableOpenSearchError(err) && attempt < attempts-1 {
+				continue
+			}
+			return errors.Join(append(failures, err)...)
+		}
+		if len(response.Items) != len(pending) {
+			return errors.Join(append(failures, fmt.Errorf("opensearch bulk returned %d item results for %d documents", len(response.Items), len(pending)))...)
+		}
+		var retry []model.Media
+		failed := false
+		for i, item := range response.Items {
+			result := item.Index
+			if result.Status >= 200 && result.Status < 300 && result.Error == nil {
+				continue
+			}
+			failed = true
+			if retryableOpenSearchStatus(result.Status) && attempt < attempts-1 {
+				retry = append(retry, pending[i])
+				continue
+			}
+			errorType := "unknown"
+			if result.Error != nil {
+				errorType = result.Error.Type
+			}
+			failures = append(failures, fmt.Errorf("opensearch bulk document %q failed: status %d (%s)", pending[i].ID, result.Status, errorType))
+		}
+		if response.Errors && !failed {
+			failures = append(failures, errors.New("opensearch bulk reported errors without failed item results"))
+		}
+		if len(retry) == 0 {
+			break
+		}
+		pending = retry
+	}
+	return errors.Join(failures...)
+}
+
+func retryableOpenSearchStatus(status int) bool {
+	return status == http.StatusRequestTimeout || status == http.StatusTooManyRequests || status >= 500
+}
+
+func retryableOpenSearchError(err error) bool {
+	var statusError *openSearchHTTPError
+	if errors.As(err, &statusError) {
+		return retryableOpenSearchStatus(statusError.status)
+	}
+	var networkError net.Error
+	return errors.As(err, &networkError)
+}
+
+func (b *OpenSearchMediaBackend) submitMediaBulk(ctx context.Context, rows []model.Media) (*openSearchBulkResponse, error) {
+	if len(rows) == 0 {
+		return &openSearchBulkResponse{}, nil
+	}
 	var bulk bytes.Buffer
 	enc := json.NewEncoder(&bulk)
 	for _, row := range rows {
 		if err := enc.Encode(map[string]any{"index": map[string]any{"_index": b.index, "_id": row.ID}}); err != nil {
-			return err
+			return nil, err
 		}
 		if err := enc.Encode(map[string]any{
 			"id":            row.ID,
@@ -155,10 +256,24 @@ func (b *OpenSearchMediaBackend) IndexMedia(ctx context.Context, rows []model.Me
 			"deleted":       row.DeletedAt.Valid,
 			"created_at":    row.CreatedAt,
 		}); err != nil {
-			return err
+			return nil, err
 		}
 	}
-	return b.do(ctx, http.MethodPost, "/_bulk", &bulk, "application/x-ndjson", nil)
+	var response openSearchBulkResponse
+	if err := b.do(ctx, http.MethodPost, "/_bulk", &bulk, "application/x-ndjson", &response); err != nil {
+		return nil, err
+	}
+	return &response, nil
+}
+
+type openSearchHTTPError struct {
+	method string
+	path   string
+	status int
+}
+
+func (e *openSearchHTTPError) Error() string {
+	return fmt.Sprintf("opensearch %s %s returned %d", e.method, e.path, e.status)
 }
 
 func (b *OpenSearchMediaBackend) doJSON(ctx context.Context, method, path string, body any, out any) error {
@@ -190,7 +305,7 @@ func (b *OpenSearchMediaBackend) do(ctx context.Context, method, path string, bo
 	}
 	defer resp.Body.Close()
 	if resp.StatusCode >= 400 {
-		return fmt.Errorf("opensearch %s %s returned %d", method, path, resp.StatusCode)
+		return &openSearchHTTPError{method: method, path: path, status: resp.StatusCode}
 	}
 	if out == nil {
 		_, _ = io.Copy(io.Discard, resp.Body)

internal/repository/opensearch_test.go

@@ -1,12 +1,23 @@
 package repository
 
 import (
+	"bufio"
+	"context"
 	"encoding/json"
+	"errors"
+	"fmt"
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"
+	"time"
+
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
 
 	"github.com/truewhile/MeBox/internal/config"
+	"github.com/truewhile/MeBox/internal/model"
 )
 
 func TestOpenSearchMediaBackendSearchesIDs(t *testing.T) {
@@ -55,3 +66,156 @@ func TestOpenSearchMediaBackendSearchesIDs(t *testing.T) {
 		t.Fatalf("ids=%#v total=%d", ids, total)
 	}
 }
+
+func bulkRequestIDs(r *http.Request) []string {
+	var ids []string
+	scanner := bufio.NewScanner(r.Body)
+	for scanner.Scan() {
+		var action struct {
+			Index struct {
+				ID string `json:"_id"`
+			} `json:"index"`
+		}
+		_ = json.Unmarshal(scanner.Bytes(), &action)
+		ids = append(ids, action.Index.ID)
+		if !scanner.Scan() {
+			break
+		}
+	}
+	return ids
+}
+
+func writeBulkResults(w http.ResponseWriter, ids []string, statuses map[string]int) {
+	items := make([]any, 0, len(ids))
+	failed := false
+	for _, id := range ids {
+		status := statuses[id]
+		if status == 0 {
+			status = http.StatusCreated
+		}
+		result := map[string]any{"_id": id, "status": status}
+		if status >= 400 {
+			failed = true
+			result["error"] = map[string]any{"type": "test_failure"}
+		}
+		items = append(items, map[string]any{"index": result})
+	}
+	_ = json.NewEncoder(w).Encode(map[string]any{"errors": failed, "items": items})
+}
+
+func TestOpenSearchBulkRetriesOnlyTransientFailedDocuments(t *testing.T) {
+	var requests [][]string
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ids := bulkRequestIDs(r)
+		requests = append(requests, ids)
+		statuses := map[string]int{}
+		if len(requests) == 1 {
+			statuses["retry"] = http.StatusTooManyRequests
+			statuses["invalid"] = http.StatusBadRequest
+		}
+		writeBulkResults(w, ids, statuses)
+	}))
+	defer upstream.Close()
+	backend := NewOpenSearchMediaBackend(config.SearchConfig{Backend: "opensearch", OpenSearchURL: upstream.URL})
+	rows := []model.Media{{Base: model.Base{ID: "ok"}}, {Base: model.Base{ID: "retry"}}, {Base: model.Base{ID: "invalid"}}}
+	err := backend.IndexMedia(t.Context(), rows)
+	if err == nil || !strings.Contains(err.Error(), `"invalid"`) {
+		t.Fatalf("error = %v, want permanent document failure", err)
+	}
+	if len(requests) != 2 || strings.Join(requests[1], ",") != "retry" {
+		t.Fatalf("requests = %#v; successful/permanent documents must not be retried", requests)
+	}
+}
+
+func TestOpenSearchBulkBoundsRetriesAndRejectsMalformedResponses(t *testing.T) {
+	for _, scenario := range []string{"transient-item", "transient-http", "invalid-http", "missing-results"} {
+		t.Run(scenario, func(t *testing.T) {
+			calls := 0
+			upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				calls++
+				switch scenario {
+				case "transient-item":
+					writeBulkResults(w, bulkRequestIDs(r), map[string]int{"m1": http.StatusServiceUnavailable})
+				case "transient-http":
+					w.WriteHeader(http.StatusServiceUnavailable)
+				case "invalid-http":
+					w.WriteHeader(http.StatusBadRequest)
+				case "missing-results":
+					fmt.Fprint(w, `{"errors":false,"items":[]}`)
+				}
+			}))
+			defer upstream.Close()
+			backend := NewOpenSearchMediaBackend(config.SearchConfig{Backend: "opensearch", OpenSearchURL: upstream.URL})
+			if err := backend.IndexMedia(t.Context(), []model.Media{{Base: model.Base{ID: "m1"}}}); err == nil {
+				t.Fatal("failed indexing was reported as successful")
+			}
+			want := 1
+			if strings.HasPrefix(scenario, "transient") {
+				want = 3
+			}
+			if calls != want {
+				t.Fatalf("calls = %d, want %d", calls, want)
+			}
+		})
+	}
+}
+
+func TestOpenSearchBulkHonorsCancellationDuringRetry(t *testing.T) {
+	ctx, cancel := context.WithCancel(t.Context())
+	defer cancel()
+	calls := 0
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		calls++
+		writeBulkResults(w, bulkRequestIDs(r), map[string]int{"m1": http.StatusTooManyRequests})
+		cancel()
+	}))
+	defer upstream.Close()
+	backend := NewOpenSearchMediaBackend(config.SearchConfig{Backend: "opensearch", OpenSearchURL: upstream.URL})
+	err := backend.IndexMedia(ctx, []model.Media{{Base: model.Base{ID: "m1"}}})
+	if !errors.Is(err, context.Canceled) || calls != 1 {
+		t.Fatalf("error = %v, calls = %d", err, calls)
+	}
+}
+
+func TestMediaUpsertBatchIndexesCommittedRowsTogether(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{Logger: logger.Default.LogMode(logger.Silent)})
+	if err != nil {
+		t.Fatal(err)
+	}
+	sqlDB, _ := db.DB()
+	sqlDB.SetMaxOpenConns(1)
+	defer sqlDB.Close()
+	if err := db.AutoMigrate(&model.Media{}); err != nil {
+		t.Fatal(err)
+	}
+	repos := New(db)
+	ctx, cancel := context.WithTimeout(t.Context(), 5*time.Second)
+	defer cancel()
+	calls := 0
+	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		calls++
+		ids := bulkRequestIDs(r)
+		if len(ids) != 5 {
+			t.Errorf("bulk contains %d documents, want 5", len(ids))
+		}
+		// With only one DB connection this also detects network work inside the
+		// transaction: a separate read could not observe the committed batch.
+		var count int64
+		if err := db.WithContext(ctx).Model(&model.Media{}).Count(&count).Error; err != nil || count != 5 {
+			t.Errorf("committed rows = %d, error = %v", count, err)
+		}
+		writeBulkResults(w, ids, nil)
+	}))
+	defer upstream.Close()
+	repos.Media.SetSearchBackend(NewOpenSearchMediaBackend(config.SearchConfig{Backend: "opensearch", OpenSearchURL: upstream.URL}))
+	var rows []*model.Media
+	for i := 0; i < 5; i++ {
+		rows = append(rows, &model.Media{LibraryID: "lib", Path: fmt.Sprintf("/media/%d.mkv", i)})
+	}
+	if err := repos.Media.UpsertBatch(ctx, rows); err != nil {
+		t.Fatal(err)
+	}
+	if calls != 1 {
+		t.Fatalf("index requests = %d, want one bulk", calls)
+	}
+}

internal/repository/refresh_token_repository.go

@@ -46,16 +46,20 @@ func (r *RefreshTokenRepository) RevokeByUserID(ctx context.Context, userID stri
 	})
 }
 
-// RevokeOldestActiveByUserID keeps at most limit active refresh tokens for a
-// user by revoking the oldest non-expired, non-revoked tokens.
-func (r *RefreshTokenRepository) RevokeOldestActiveByUserID(ctx context.Context, userID string, limit int) error {
+// RevokeOldestActiveLegacyByUserID keeps at most limit active refresh tokens
+// for a user among tokens that are not bound to a device auth session
+// (legacy web clients). Device sessions are independent: trimming one
+// device's token because another device logged in would silently sign the
+// first device out even though its session is still valid.
+func (r *RefreshTokenRepository) RevokeOldestActiveLegacyByUserID(ctx context.Context, userID string, limit int) error {
 	if limit < 1 {
 		limit = 1
 	}
 	return withSQLiteBusyRetry(ctx, func() error {
 		var tokens []model.RefreshToken
 		if err := r.db.WithContext(ctx).
-			Where("user_id = ? AND revoked = ? AND expires_at > ?", userID, false, time.Now()).
+			Where("user_id = ? AND revoked = ? AND expires_at > ? AND (auth_session_id IS NULL OR auth_session_id = '')",
+				userID, false, time.Now()).
 			Order("created_at desc, id desc").
 			Find(&tokens).Error; err != nil {
 			return err
@@ -79,7 +83,7 @@ func (r *RefreshTokenRepository) DeleteExpired(ctx context.Context) error {
 	})
 }
 
-// Revoke revokes a specific refresh token.
+// Revoke 撤销某个刷新令牌。
 func (r *RefreshTokenRepository) Revoke(ctx context.Context, hash string) error {
 	return withSQLiteBusyRetry(ctx, func() error {
 		return r.db.WithContext(ctx).Model(&model.RefreshToken{}).
@@ -87,6 +91,18 @@ func (r *RefreshTokenRepository) Revoke(ctx context.Context, hash string) error
 	})
 }
 
+// RevokeByAuthSessionID 撤销某个认证会话名下的全部刷新令牌。
+// 设备被踢或主动退出后，旧刷新令牌不能再换出新令牌。
+func (r *RefreshTokenRepository) RevokeByAuthSessionID(ctx context.Context, sessionID string) error {
+	if sessionID == "" {
+		return nil
+	}
+	return withSQLiteBusyRetry(ctx, func() error {
+		return r.db.WithContext(ctx).Model(&model.RefreshToken{}).
+			Where("auth_session_id = ?", sessionID).Update("revoked", true).Error
+	})
+}
+
 // HashToken returns the SHA256 hash of a token.
 func HashToken(token string) string {
 	h := sha256.Sum256([]byte(token))

internal/repository/repository.go

@@ -23,6 +23,7 @@ type Container struct {
 	Log            *AccessLogRepository
 	Permission     *PermissionRepository
 	RefreshToken   *RefreshTokenRepository
+	AuthSession    *AuthSessionRepository
 	ApiConfig      *ApiConfigRepository
 	PlayProfile    *PlayProfileRepository
 	RegCode        *RegistrationCodeRepository
@@ -34,6 +35,7 @@ type Container struct {
 	StrmDownload   *StrmDownloadTaskRepository
 	StrmUpload     *StrmUploadTaskRepository
 	StrmDirCache   *StrmDirCacheRepository
+	CloudDownload  *CloudDownloadRepository
 	ScrapeTask     *ScrapeTaskRepository
 	EmbyMount      *EmbyMountRepository
 	Reader         *ReaderRepository
@@ -56,6 +58,7 @@ func New(db *gorm.DB) *Container {
 		Log:            &AccessLogRepository{db: db},
 		Permission:     &PermissionRepository{db: db},
 		RefreshToken:   &RefreshTokenRepository{db: db},
+		AuthSession:    &AuthSessionRepository{db: db},
 		ApiConfig:      &ApiConfigRepository{db: db},
 		PlayProfile:    &PlayProfileRepository{db: db},
 		RegCode:        &RegistrationCodeRepository{db: db},
@@ -67,6 +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},

internal/service/adult_image_crop.go

@@ -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()

internal/service/adult_image_crop_test.go

@@ -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 {

internal/service/adult_scraper_routing_test.go

@@ -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)
 	}
 }

internal/service/api_config_connection.go

@@ -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":

internal/service/api_config_metadata_connection.go

@@ -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
+}

internal/service/api_config_metadata_connection_test.go

@@ -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)
+	}
+}

internal/service/auth.go

@@ -34,6 +34,7 @@ type AuthService struct {
 	repo          *repository.Container
 	tokenSvc      *TokenService
 	permissionSvc *PermissionService
+	sessionSvc    *AuthSessionService
 
 	tempPassMu    sync.RWMutex
 	tempPasswords map[string]temporaryPasswordEntry
@@ -51,6 +52,11 @@ func NewAuthService(cfg *config.Config, log *zap.Logger, repo *repository.Contai
 	}
 }
 
+// SetAuthSessionService 注入设备会话服务；旧登出路径会同时撤销全部会话。
+func (s *AuthService) SetAuthSessionService(sessions *AuthSessionService) {
+	s.sessionSvc = sessions
+}
+
 // Common service-level errors.
 var (
 	ErrInvalidCredentials = errors.New("invalid username or password")
@@ -162,6 +168,23 @@ type LoginResponse struct {
 
 // Login validates credentials and returns the user + a fresh JWT token pair.
 func (s *AuthService) Login(ctx context.Context, username, password string) (*LoginResponse, error) {
+	u, err := s.Authenticate(ctx, username, password)
+	if err != nil {
+		return nil, err
+	}
+	// 签发令牌对
+	tokens, err := s.tokenSvc.IssuePairBestEffort(ctx, u.ID, u.Role, u.Tier)
+	if err != nil {
+		return nil, err
+	}
+	s.touchLoginBestEffort(u.ID)
+	return &LoginResponse{User: u, Tokens: tokens}, nil
+}
+
+// Authenticate 只校验账号与密码，不签发任何令牌。
+// 移动端 v1 登录需要先确认账号有效，再创建设备会话并签发带 sid 的令牌；
+// 分离这一步可以避免先签发一对无会话的令牌再作废。
+func (s *AuthService) Authenticate(ctx context.Context, username, password string) (*model.User, error) {
 	u, err := s.repo.User.FindByUsername(ctx, username)
 	if err != nil {
 		return nil, err
@@ -180,13 +203,7 @@ func (s *AuthService) Login(ctx context.Context, username, password string) (*Lo
 	if err := bcrypt.CompareHashAndPassword([]byte(u.PasswordHash), []byte(password)); err != nil {
 		return nil, ErrInvalidCredentials
 	}
-	// 签发令牌对
-	tokens, err := s.tokenSvc.IssuePairBestEffort(ctx, u.ID, u.Role, u.Tier)
-	if err != nil {
-		return nil, err
-	}
-	s.touchLoginBestEffort(u.ID)
-	return &LoginResponse{User: u, Tokens: tokens}, nil
+	return u, nil
 }
 
 func (s *AuthService) touchLoginBestEffort(userID string) {

internal/service/auth_session.go

@@ -0,0 +1,187 @@
+// Package service — 设备认证会话。
+package service
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"time"
+	"unicode"
+
+	"go.uber.org/zap"
+
+	"github.com/truewhile/MeBox/internal/model"
+	"github.com/truewhile/MeBox/internal/repository"
+)
+
+// 认证会话错误。middleware 与 handler 依据这些错误区分「重新登录」和
+// 「临时基础设施故障」。
+var (
+	ErrAuthSessionRequired = errors.New("auth session required")
+	ErrAuthSessionRevoked  = errors.New("auth session revoked")
+	ErrAuthSessionExpired  = errors.New("auth session expired")
+)
+
+// AuthSessionService 管理设备会话的创建、校验和撤销。
+type AuthSessionService struct {
+	log  *zap.Logger
+	repo *repository.Container
+	now  func() time.Time
+}
+
+// NewAuthSessionService 创建会话服务。
+func NewAuthSessionService(log *zap.Logger, repo *repository.Container) *AuthSessionService {
+	return &AuthSessionService{log: log, repo: repo, now: time.Now}
+}
+
+// CreateAuthSessionInput 是创建会话所需的最小设备信息。
+type CreateAuthSessionInput struct {
+	UserID        string
+	DeviceID      string
+	DeviceName    string
+	ClientName    string
+	ClientVersion string
+}
+
+// Create 创建一次登录对应的认证会话。
+//
+// 设备 ID 由 App 安装随机生成，不接收 IMEI/MAC 等硬件标识；这里只做长度
+// 与字符白名单校验，避免任意字符串进入索引和日志。
+func (s *AuthSessionService) Create(ctx context.Context, in CreateAuthSessionInput) (*model.AuthSession, error) {
+	userID := strings.TrimSpace(in.UserID)
+	deviceID := strings.TrimSpace(in.DeviceID)
+	if userID == "" || deviceID == "" {
+		return nil, errors.New("user id and device id required")
+	}
+	if len(deviceID) > 128 || !validDeviceID(deviceID) {
+		return nil, errors.New("invalid device id")
+	}
+	now := s.currentTime()
+	session := &model.AuthSession{
+		UserID:        userID,
+		DeviceID:      deviceID,
+		DeviceName:    truncateRunes(strings.TrimSpace(in.DeviceName), 128),
+		ClientName:    truncateRunes(strings.TrimSpace(in.ClientName), 64),
+		ClientVersion: truncateRunes(strings.TrimSpace(in.ClientVersion), 64),
+		LastUsedAt:    now,
+		ExpiresAt:     now.Add(RefreshTokenDuration),
+	}
+	if err := s.repo.AuthSession.Create(ctx, session); err != nil {
+		return nil, err
+	}
+	return session, nil
+}
+
+// Validate 校验会话仍可用于给定用户。
+//
+// 未找到的会话按「已撤销」处理：App 收到 SESSION_REVOKED 后应重新登录，
+// 而不是无限刷新。数据库错误保持原样返回，由上层映射成可重试的 503。
+func (s *AuthSessionService) Validate(ctx context.Context, sessionID, userID string) (*model.AuthSession, error) {
+	sessionID = strings.TrimSpace(sessionID)
+	if sessionID == "" {
+		return nil, ErrAuthSessionRequired
+	}
+	session, err := s.repo.AuthSession.FindByID(ctx, sessionID)
+	if err != nil {
+		return nil, err
+	}
+	if session == nil || session.UserID != userID {
+		return nil, ErrAuthSessionRevoked
+	}
+	if session.Revoked {
+		return nil, ErrAuthSessionRevoked
+	}
+	if session.IsExpired() {
+		return nil, ErrAuthSessionExpired
+	}
+	return session, nil
+}
+
+// Touch 更新会话最近使用时间，失败只记日志，不影响请求。
+func (s *AuthSessionService) Touch(ctx context.Context, sessionID string) {
+	if s == nil || sessionID == "" {
+		return
+	}
+	if err := s.repo.AuthSession.TouchLastUsed(ctx, sessionID, s.currentTime()); err != nil && s.log != nil {
+		s.log.Debug("touch auth session failed", zap.String("session_id", sessionID), zap.Error(err))
+	}
+}
+
+// Revoke 撤销单个会话及其名下刷新令牌（幂等）。
+func (s *AuthSessionService) Revoke(ctx context.Context, sessionID string) error {
+	sessionID = strings.TrimSpace(sessionID)
+	if sessionID == "" {
+		return nil
+	}
+	if err := s.repo.AuthSession.Revoke(ctx, sessionID, s.currentTime()); err != nil {
+		return err
+	}
+	return s.repo.RefreshToken.RevokeByAuthSessionID(ctx, sessionID)
+}
+
+// RevokeByUser 撤销某用户的全部会话（幂等）。
+func (s *AuthSessionService) RevokeByUser(ctx context.Context, userID string) error {
+	userID = strings.TrimSpace(userID)
+	if userID == "" {
+		return nil
+	}
+	sessions, err := s.repo.AuthSession.ListActiveByUser(ctx, userID)
+	if err != nil {
+		return err
+	}
+	for i := range sessions {
+		if err := s.Revoke(ctx, sessions[i].ID); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// RevokeDevice 撤销某用户某设备的全部会话（幂等）。
+func (s *AuthSessionService) RevokeDevice(ctx context.Context, userID, deviceID string) error {
+	userID = strings.TrimSpace(userID)
+	deviceID = strings.TrimSpace(deviceID)
+	if userID == "" || deviceID == "" {
+		return nil
+	}
+	sessions, err := s.repo.AuthSession.ListByDevice(ctx, userID, deviceID)
+	if err != nil {
+		return err
+	}
+	for i := range sessions {
+		if sessions[i].Revoked {
+			continue
+		}
+		if err := s.Revoke(ctx, sessions[i].ID); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (s *AuthSessionService) currentTime() time.Time {
+	if s == nil || s.now == nil {
+		return time.Now()
+	}
+	return s.now()
+}
+
+func validDeviceID(id string) bool {
+	for _, r := range id {
+		if r > unicode.MaxASCII || !(unicode.IsLetter(r) || unicode.IsDigit(r) || r == '-' || r == '_' || r == '.' || r == ':') {
+			return false
+		}
+	}
+	return true
+}
+
+func truncateRunes(s string, max int) string {
+	if max <= 0 {
+		return ""
+	}
+	runes := []rune(s)
+	if len(runes) <= max {
+		return s
+	}
+	return string(runes[:max])
+}

internal/service/auth_session_test.go

@@ -0,0 +1,261 @@
+package service
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"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 newAuthSessionTestEnv(t *testing.T) (*AuthSessionService, *TokenService, *repository.Container) {
+	t.Helper()
+	db := newServiceTestDB(t, &model.AuthSession{}, &model.RefreshToken{}, &model.User{}, &model.Setting{})
+	repos := repository.New(db)
+	sessions := NewAuthSessionService(zap.NewNop(), repos)
+	cfg := &config.Config{}
+	cfg.Secrets.JWTSecret = "test-secret"
+	tokens := NewTokenService(cfg, zap.NewNop(), repos)
+	tokens.SetSessionValidator(func(ctx context.Context, sessionID, userID string) error {
+		_, err := sessions.Validate(ctx, sessionID, userID)
+		return err
+	})
+	return sessions, tokens, repos
+}
+
+func seedSessionUser(t *testing.T, repos *repository.Container) *model.User {
+	t.Helper()
+	u := &model.User{Username: "mobile", PasswordHash: "x", Role: "user", Tier: "free", IsActive: true}
+	if err := repos.User.Create(t.Context(), u); err != nil {
+		t.Fatal(err)
+	}
+	return u
+}
+
+func TestAuthSessionLifecycle(t *testing.T) {
+	sessions, tokens, repos := newAuthSessionTestEnv(t)
+	ctx := context.Background()
+	user := seedSessionUser(t, repos)
+
+	session, err := sessions.Create(ctx, CreateAuthSessionInput{
+		UserID:     user.ID,
+		DeviceID:   "device-abc",
+		DeviceName: "Pixel",
+		ClientName: "MeBox Android",
+	})
+	if err != nil {
+		t.Fatalf("create session: %v", err)
+	}
+	if session.ID == "" || session.ExpiresAt.IsZero() {
+		t.Fatal("session missing id or expiry")
+	}
+	if _, err := sessions.Validate(ctx, session.ID, user.ID); err != nil {
+		t.Fatalf("validate active session: %v", err)
+	}
+	if _, err := sessions.Validate(ctx, session.ID, "other-user"); !errors.Is(err, ErrAuthSessionRevoked) {
+		t.Fatalf("cross-user validate err = %v, want ErrAuthSessionRevoked", err)
+	}
+
+	pair, err := tokens.IssuePairForSession(ctx, user.ID, user.Role, user.Tier, session.ID)
+	if err != nil {
+		t.Fatalf("issue pair: %v", err)
+	}
+	claims, err := tokens.ValidateAccessToken(pair.AccessToken)
+	if err != nil {
+		t.Fatalf("validate access token: %v", err)
+	}
+	if claims.Sid != session.ID {
+		t.Fatalf("access token sid = %q, want %q", claims.Sid, session.ID)
+	}
+	rt, err := repos.RefreshToken.FindByHash(ctx, repository.HashToken(pair.RefreshToken))
+	if err != nil || rt == nil {
+		t.Fatalf("refresh token row = %v, err = %v", rt, err)
+	}
+	if rt.AuthSessionID != session.ID {
+		t.Fatalf("refresh token session = %q, want %q", rt.AuthSessionID, session.ID)
+	}
+
+	if err := sessions.Revoke(ctx, session.ID); err != nil {
+		t.Fatalf("revoke session: %v", err)
+	}
+	if _, err := sessions.Validate(ctx, session.ID, user.ID); !errors.Is(err, ErrAuthSessionRevoked) {
+		t.Fatalf("validate revoked err = %v, want ErrAuthSessionRevoked", err)
+	}
+	rt, err = repos.RefreshToken.FindByHash(ctx, repository.HashToken(pair.RefreshToken))
+	if err != nil || rt == nil {
+		t.Fatalf("reload refresh token: %v", err)
+	}
+	if !rt.Revoked {
+		t.Fatal("refresh token should be revoked with the session")
+	}
+
+	// 幂等：重复撤销不报错。
+	if err := sessions.Revoke(ctx, session.ID); err != nil {
+		t.Fatalf("second revoke: %v", err)
+	}
+}
+
+func TestRefreshRejectsRevokedSession(t *testing.T) {
+	sessions, tokens, repos := newAuthSessionTestEnv(t)
+	ctx := context.Background()
+	user := seedSessionUser(t, repos)
+
+	session, err := sessions.Create(ctx, CreateAuthSessionInput{UserID: user.ID, DeviceID: "device-1"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	pair, err := tokens.IssuePairForSession(ctx, user.ID, user.Role, user.Tier, session.ID)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := sessions.Revoke(ctx, session.ID); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := tokens.Refresh(ctx, pair.RefreshToken); !errors.Is(err, ErrAuthSessionRevoked) {
+		t.Fatalf("refresh revoked session err = %v, want ErrAuthSessionRevoked", err)
+	}
+}
+
+func TestRefreshKeepsSessionAssociation(t *testing.T) {
+	sessions, tokens, repos := newAuthSessionTestEnv(t)
+	ctx := context.Background()
+	user := seedSessionUser(t, repos)
+
+	session, err := sessions.Create(ctx, CreateAuthSessionInput{UserID: user.ID, DeviceID: "device-2"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	pair, err := tokens.IssuePairForSession(ctx, user.ID, user.Role, user.Tier, session.ID)
+	if err != nil {
+		t.Fatal(err)
+	}
+	rotated, err := tokens.Refresh(ctx, pair.RefreshToken)
+	if err != nil {
+		t.Fatalf("refresh: %v", err)
+	}
+	claims, err := tokens.ValidateAccessToken(rotated.AccessToken)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if claims.Sid != session.ID {
+		t.Fatalf("rotated access sid = %q, want %q", claims.Sid, session.ID)
+	}
+	// 刷新路径使用 best-effort 落库；轮换结果可能稍后才写入。
+	var rt *model.RefreshToken
+	deadline := time.Now().Add(3 * time.Second)
+	for time.Now().Before(deadline) {
+		rt, err = repos.RefreshToken.FindByHash(ctx, repository.HashToken(rotated.RefreshToken))
+		if err == nil && rt != nil {
+			break
+		}
+		time.Sleep(20 * time.Millisecond)
+	}
+	if err != nil || rt == nil {
+		t.Fatalf("rotated refresh row: %v err=%v", rt, err)
+	}
+	if rt.AuthSessionID != session.ID {
+		t.Fatalf("rotated refresh session = %q, want %q", rt.AuthSessionID, session.ID)
+	}
+}
+
+// TestMobileDeviceSessionsDoNotTrimEachOther 覆盖同一账号多设备登录：
+// 每台设备有独立认证会话与刷新令牌，新设备登录或任一设备刷新都不应撤销
+// 其他设备的刷新令牌。历史实现把「最大同时登录终端」直接作用在刷新令牌
+// 上，第 N+1 台设备登录会把最早那台设备的刷新令牌标记为已撤销，那台设备
+// 下一次刷新就会收到 SESSION_REVOKED，被强制退回登录页。
+func TestMobileDeviceSessionsDoNotTrimEachOther(t *testing.T) {
+	sessions, tokens, repos := newAuthSessionTestEnv(t)
+	ctx := context.Background()
+	user := seedSessionUser(t, repos)
+
+	// 默认上限是 3，这里故意登录 4 台设备。
+	const devices = 4
+	pairs := make([]*TokenPair, 0, devices)
+	for i := 0; i < devices; i++ {
+		session, err := sessions.Create(ctx, CreateAuthSessionInput{
+			UserID:     user.ID,
+			DeviceID:   fmt.Sprintf("device-%02d", i),
+			DeviceName: fmt.Sprintf("Phone %d", i+1),
+		})
+		if err != nil {
+			t.Fatalf("create session %d: %v", i+1, err)
+		}
+		pair, err := tokens.IssuePairForSession(ctx, user.ID, user.Role, user.Tier, session.ID)
+		if err != nil {
+			t.Fatalf("issue pair %d: %v", i+1, err)
+		}
+		pairs = append(pairs, pair)
+	}
+
+	for i, pair := range pairs {
+		row, err := repos.RefreshToken.FindByHash(ctx, repository.HashToken(pair.RefreshToken))
+		if err != nil {
+			t.Fatalf("load device %d token: %v", i+1, err)
+		}
+		if row == nil {
+			t.Fatalf("device %d refresh token missing", i+1)
+		}
+		if row.Revoked {
+			t.Fatalf("device %d refresh token was revoked by another device", i+1)
+		}
+		if _, err := tokens.Refresh(ctx, pair.RefreshToken); err != nil {
+			t.Fatalf("device %d refresh failed: %v", i+1, err)
+		}
+	}
+}
+
+func TestServerIdentityPersistsAcrossInstances(t *testing.T) {
+	db := newServiceTestDB(t, &model.Setting{})
+	repos := repository.New(db)
+	ctx := context.Background()
+
+	first := NewServerIdentityService(repos, "MeBox-v1.2.3")
+	id1, err := first.ServerID(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if id1 == "" {
+		t.Fatal("empty server id")
+	}
+
+	// 独立服务实例（模拟重启）读到同一个持久身份。
+	second := NewServerIdentityService(repos, "MeBox-v1.2.3")
+	id2, err := second.ServerID(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if id2 != id1 {
+		t.Fatalf("server id changed across instances: %q != %q", id2, id1)
+	}
+
+	info, err := second.Info(ctx, ServerCapabilities{DeviceSessions: true})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if info.ServerID != id1 || info.ServerVersion != "MeBox-v1.2.3" || info.APIVersion != "v1" {
+		t.Fatalf("unexpected info: %+v", info)
+	}
+	if !info.Capabilities.DeviceSessions || info.Capabilities.PlaybackSessions {
+		t.Fatalf("unexpected capabilities: %+v", info.Capabilities)
+	}
+}
+
+func TestAuthSessionExpiry(t *testing.T) {
+	sessions, _, repos := newAuthSessionTestEnv(t)
+	user := seedSessionUser(t, repos)
+	sessions.now = func() time.Time { return time.Now().Add(-40 * 24 * time.Hour) }
+	session, err := sessions.Create(context.Background(), CreateAuthSessionInput{UserID: user.ID, DeviceID: "device-old"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	sessions.now = time.Now
+	if _, err := sessions.Validate(context.Background(), session.ID, user.ID); !errors.Is(err, ErrAuthSessionExpired) {
+		t.Fatalf("expired validate err = %v, want ErrAuthSessionExpired", err)
+	}
+}