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/service/service.go

@@ -28,7 +28,10 @@ type Container struct {
 	FFprobe      *FFprobeService
 	TMDb         *TMDbProvider
 	Bangumi      *BangumiProvider
+	TheTVDB      *TheTVDBProvider
+	Fanart       *FanartProvider
 	Scraper      *ScraperService
+	Discover     *DiscoverService
 	Playback     *PlaybackService
 	ImageProxy   *ImageProxy
 	Watcher      *WatcherService
@@ -38,6 +41,8 @@ type Container struct {
 	Stats        *StatsService
 	Profile      *ProfileService
 	Audit        *AuditService
+	NFO          *NFOService
+	AI           *AIService
 
 	stopCtx    context.Context
 	stopCancel context.CancelFunc
@@ -51,12 +56,17 @@ func New(cfg *config.Config, log *zap.Logger, repos *repository.Container) *Cont
 	probe := NewFFprobeService(cfg, log)
 	tmdb := NewTMDbProvider(cfg, log)
 	bangumi := NewBangumiProvider(cfg, log)
-	scraper := NewScraperService(cfg, log, repos, tmdb, bangumi, hub)
+	thetvdb := NewTheTVDBProvider(cfg, log)
+	fanart := NewFanartProvider(cfg, log)
+	scraper := NewScraperService(cfg, log, repos, tmdb, bangumi, thetvdb, fanart, hub)
+	discover := NewDiscoverService(log, tmdb)
 	transcoder := NewTranscoderService(cfg, log, repos, hub)
 	scanner := NewScannerService(cfg, log, repos, hub, probe, scraper)
 	downloads := NewDownloadService(log, repos, hub)
 	subscription := NewSubscriptionService(log, repos, downloads, hub)
 	watcher := NewWatcherService(log, repos, scanner)
+	nfo := NewNFOService(log, repos)
+	ai := NewAIService(cfg, log)
 
 	ctx, cancel := context.WithCancel(context.Background())
 
@@ -73,7 +83,10 @@ func New(cfg *config.Config, log *zap.Logger, repos *repository.Container) *Cont
 		FFprobe:      probe,
 		TMDb:         tmdb,
 		Bangumi:      bangumi,
+		TheTVDB:      thetvdb,
+		Fanart:       fanart,
 		Scraper:      scraper,
+		Discover:     discover,
 		Playback:     NewPlaybackService(log, repos),
 		ImageProxy:   NewImageProxy(cfg, log),
 		Watcher:      watcher,
@@ -83,6 +96,8 @@ func New(cfg *config.Config, log *zap.Logger, repos *repository.Container) *Cont
 		Stats:        NewStatsService(log, repos),
 		Profile:      NewProfileService(log, repos),
 		Audit:        NewAuditService(log, repos),
+		NFO:          nfo,
+		AI:           ai,
 		stopCtx:      ctx,
 		stopCancel:   cancel,
 	}