feat: hwaccel + Fanart/TheTVDB + AI + Discover + NFO + Tasks + Recycle bin

Backend
  - service/transcoder.go: encoder selector (software / nvenc / qsv /
    vaapi) with proper hwaccel + scale_* filters per encoder; configurable
    bitrate/preset/height/segment-seconds via transcoder.* config; new
    Active() snapshot + ActiveJob struct for the Tasks panel; unit-tested
    via buildFFmpegArgs(...).
  - service/thetvdb.go: TheTVDB v4 provider — login() caches the JWT for
    24h, SearchSeries() returns Match struct.
  - service/fanart.go: Fanart.tv provider — high-res movie artwork keyed
    by TMDb id; used to upgrade poster/backdrop after a successful match.
  - service/scraper.go: provider chain reworked — anime → Bangumi, tv →
    TheTVDB, default → TMDb, with optional Fanart upgrade post-match.
  - service/discover.go: TMDb /trending/movie/day + /movie/popular for
    the Discover rail.
  - service/ai.go: OpenAI-compatible client. SmartSearch() turns a free-
    form query into a structured SearchIntent JSON; Recommend() emits a
    short list of titles given the user's history. Disabled when
    ai.api_key is empty.
  - service/nfo.go: per-movie .nfo writer (Kodi/Jellyfin schema) +
    library-scope batch exporter.
  - service/media.go: SoftDelete / Restore / Purge / ListRecycleBin
    helpers backed by gorm Unscoped().
  - service/service.go: container wires Fanart, TheTVDB, Discover, AI,
    NFO; everything still tears down cleanly via Close().
  - config: new transcoder.* section (encoder, preset, video_bitrate,
    max_rate, buf_size, max_height, segment_seconds) with sensible
    defaults.

Handlers / routes
  - new files: discover.go, recycle.go, nfo.go, ai.go, tasks.go.
  - registers GET /tasks, /discover/{trending,popular},
    /ai/{status,search,recommend}; admin-only GET /recycle and
    DELETE/POST /media/:id (soft delete / restore / purge); admin-only
    POST /media/:id/nfo and /libraries/:id/nfo.

Frontend
  - new pages: DiscoverPage, TasksPage, RecycleBinPage; SearchPage gains
    an optional AI smart-search toggle that calls /api/ai/search.
  - MediaDetailPage gains admin actions for 导出 NFO and 移至回收站.
  - new api/ helpers: ai.ts, discover.ts, recycle.ts, tasks.ts.
  - App.tsx routes /discover, /tasks, /recycle (last two admin-only).
  - Layout sidebar groups now include Discover + Tasks + Recycle Bin.

Docker / config
  - Dockerfile: adds intel-media-driver / libva-utils / mesa-va-gallium
    so QSV + VAAPI work out of the box on Intel iGPUs.
  - docker-compose.yml: documents devices + group_add + nvidia runtime
    overrides for hardware transcoding.

Verified: go build, go vet, go test (incl. new TestBuildFFmpegArgs across
software / nvenc / qsv / vaapi encoder profiles); tsc -b && vite build
emits 22 route chunks plus the deferred hls chunk; main bundle 248 KB /
83 KB gzipped.

internal/handler/handler.go

@@ -50,8 +50,13 @@ func Register(r *gin.Engine, cfg *config.Config, log *zap.Logger, svc *service.C
 			authed.GET("/media", searchMediaHandler(svc))
 			authed.POST("/media/:id/scrape", middleware.AdminRequired(), scrapeOneHandler(svc))
 			authed.POST("/media/:id/probe", middleware.AdminRequired(), reprobeHandler(svc))
+			authed.DELETE("/media/:id", middleware.AdminRequired(), deleteMediaHandler(svc))
+			authed.POST("/media/:id/restore", middleware.AdminRequired(), restoreMediaHandler(svc))
+			authed.DELETE("/media/:id/purge", middleware.AdminRequired(), purgeMediaHandler(svc))
 			authed.GET("/media/:id/subtitles", listSubtitlesHandler(svc))
 			authed.GET("/subtitles/:id", serveSubtitleHandler(svc))
+			authed.POST("/media/:id/nfo", middleware.AdminRequired(), exportNFOHandler(svc))
+			authed.POST("/libraries/:id/nfo", middleware.AdminRequired(), exportLibraryNFOHandler(svc))
 
 			// Streaming.
 			authed.GET("/stream/:id", streamHandler(svc))
@@ -90,6 +95,19 @@ func Register(r *gin.Engine, cfg *config.Config, log *zap.Logger, svc *service.C
 
 			// Stats / dashboard.
 			authed.GET("/stats", statsHandler(svc))
+			authed.GET("/tasks", tasksHandler(svc))
+
+			// Discover (TMDb trending / popular).
+			authed.GET("/discover/trending", trendingHandler(svc))
+			authed.GET("/discover/popular", popularHandler(svc))
+
+			// AI.
+			authed.GET("/ai/status", aiStatusHandler(svc))
+			authed.POST("/ai/search", smartSearchHandler(svc))
+			authed.GET("/ai/recommend", aiRecommendHandler(svc))
+
+			// Recycle bin.
+			authed.GET("/recycle", middleware.AdminRequired(), listRecycleHandler(svc))
 
 			authed.GET("/ws", wsHandler(svc))
 		}