fix(media): 修复emby电影库混入剧集/特别篇识别/剧集合集 + 新增手动编辑元数据

emby 兼容层(hills/yamby 等客户端):
- 电影库不再混入剧集:filterLikelyEpisodicPathsFromMovieQuery 按路径
  特征(Season/S0x/Specials/电视剧/日番/国漫等)剔除误入电影库的剧集
- itemPayload 改用 mediaShouldBeEpisode:有季集号且(属剧集库或路径像剧集)
  才标记为 Episode,修正电影库里剧集被当成 Movie

特别篇识别:
- episode_parser 新增 patSpecialSeason,识别 S0/Season 0/Specials/SP/OVA/
  OAD/番外/特别篇/特典 文件夹 → 第0季;seasonFromParents 返回 found 标志,
  区分"明确第0季"与"未识别默认第1季"
- emby seasonDir 正则同步支持 Specials/SP/OVA/特别篇 等

剧集合集:
- groupSeries 抽出 isSeriesCard,卡片链接按是否剧集判定,修复剧集卡片
  跳转;每集分离的根因(季集号/分组key)随入库识别修复一并改善

手动编辑元数据(自采集视频无TMDB信息时可自定义封面/标题/简介/分类):
- 新增 MediaService.UpdateMetadata + PATCH /media/:id/metadata(需admin)
- 前端 MetadataEditDialog 接入 LibraryPage 与 MediaDetailPage

其他:scanner/scraper/nfo/local+cloud_metadata/adult 元数据识别配套改进;
.gitignore 忽略本地 .dev-cache/.dev-data 运行产物。

internal/service/media_metadata.go

@@ -0,0 +1,148 @@
+package service
+
+import (
+	"context"
+	"errors"
+	"strings"
+
+	"github.com/ShukeBta/MediaStationGo/internal/model"
+)
+
+type MediaMetadataUpdate struct {
+	Title        *string  `json:"title"`
+	OriginalName *string  `json:"original_name"`
+	Overview     *string  `json:"overview"`
+	PosterURL    *string  `json:"poster_url"`
+	BackdropURL  *string  `json:"backdrop_url"`
+	Year         *int     `json:"year"`
+	Rating       *float32 `json:"rating"`
+	SeasonNum    *int     `json:"season_num"`
+	EpisodeNum   *int     `json:"episode_num"`
+	TMDbID       *int     `json:"tmdb_id"`
+	BangumiID    *int     `json:"bangumi_id"`
+	DoubanID     *string  `json:"douban_id"`
+	TheTVDBID    *string  `json:"thetvdb_id"`
+	Languages    *string  `json:"languages"`
+	Countries    *string  `json:"countries"`
+	Genres       *string  `json:"genres"`
+	NSFW         *bool    `json:"nsfw"`
+}
+
+func (s *MediaService) UpdateMetadata(ctx context.Context, id string, req MediaMetadataUpdate) (*model.Media, error) {
+	if s == nil || s.repo == nil || s.repo.DB == nil {
+		return nil, errors.New("media service unavailable")
+	}
+	id = strings.TrimSpace(id)
+	if id == "" {
+		return nil, errors.New("media id required")
+	}
+	if existing, err := s.repo.Media.FindByID(ctx, id); err != nil {
+		return nil, err
+	} else if existing == nil {
+		return nil, errors.New("media not found")
+	}
+	updates := map[string]any{"scrape_status": "matched"}
+	if req.Title != nil {
+		title := strings.TrimSpace(*req.Title)
+		if title == "" {
+			return nil, errors.New("title required")
+		}
+		updates["title"] = title
+	}
+	if req.OriginalName != nil {
+		updates["original_name"] = strings.TrimSpace(*req.OriginalName)
+	}
+	if req.Overview != nil {
+		updates["overview"] = strings.TrimSpace(*req.Overview)
+	}
+	if req.PosterURL != nil {
+		updates["poster_url"] = strings.TrimSpace(*req.PosterURL)
+	}
+	if req.BackdropURL != nil {
+		updates["backdrop_url"] = strings.TrimSpace(*req.BackdropURL)
+	}
+	if req.Year != nil {
+		updates["year"] = clampNonNegativeInt(*req.Year)
+	}
+	if req.Rating != nil {
+		updates["rating"] = clampRating(*req.Rating)
+	}
+	if req.SeasonNum != nil {
+		updates["season_num"] = clampNonNegativeInt(*req.SeasonNum)
+	}
+	if req.EpisodeNum != nil {
+		updates["episode_num"] = clampNonNegativeInt(*req.EpisodeNum)
+	}
+	if req.TMDbID != nil {
+		updates["tm_db_id"] = clampNonNegativeInt(*req.TMDbID)
+	}
+	if req.BangumiID != nil {
+		updates["bangumi_id"] = clampNonNegativeInt(*req.BangumiID)
+	}
+	if req.DoubanID != nil {
+		updates["douban_id"] = strings.TrimSpace(*req.DoubanID)
+	}
+	if req.TheTVDBID != nil {
+		updates["thetvdb_id"] = strings.TrimSpace(*req.TheTVDBID)
+	}
+	if req.Languages != nil {
+		updates["languages"] = normalizeMetadataCSV(*req.Languages)
+	}
+	if req.Countries != nil {
+		updates["countries"] = normalizeMetadataCSV(*req.Countries)
+	}
+	if req.Genres != nil {
+		updates["genres"] = normalizeMetadataCSV(*req.Genres)
+	}
+	if req.NSFW != nil {
+		updates["nsfw"] = *req.NSFW
+	}
+	if err := s.repo.DB.WithContext(ctx).Model(&model.Media{}).Where("id = ?", id).Updates(updates).Error; err != nil {
+		return nil, err
+	}
+	s.invalidateMediaCache(ctx)
+	return s.repo.Media.FindByID(ctx, id)
+}
+
+func normalizeMetadataCSV(value string) string {
+	parts := strings.FieldsFunc(value, func(r rune) bool {
+		switch r {
+		case ',', '，', ';', '；', '\n', '\r', '\t':
+			return true
+		default:
+			return false
+		}
+	})
+	out := make([]string, 0, len(parts))
+	seen := map[string]struct{}{}
+	for _, part := range parts {
+		part = strings.TrimSpace(part)
+		if part == "" {
+			continue
+		}
+		key := strings.ToLower(part)
+		if _, ok := seen[key]; ok {
+			continue
+		}
+		seen[key] = struct{}{}
+		out = append(out, part)
+	}
+	return strings.Join(out, ",")
+}
+
+func clampNonNegativeInt(value int) int {
+	if value < 0 {
+		return 0
+	}
+	return value
+}
+
+func clampRating(value float32) float32 {
+	if value < 0 {
+		return 0
+	}
+	if value > 10 {
+		return 10
+	}
+	return value
+}