feat: ffprobe + TMDb scrape + HLS transcode + history/favourites/playlists

Backend
  - service/ffprobe.go: thin ffprobe wrapper, parses duration / resolution /
    codecs into a typed ProbeResult. 30s per-file timeout.
  - service/tmdb.go: minimal TMDb provider (search/movie). Disabled when no
    api key; supports tmdb_api_proxy / tmdb_image_proxy overrides for users
    behind a firewall.
  - service/scraper.go: filename cleaner (handles bracketed tags, scene
    noise tokens, year extraction), per-row + per-library enrichment with a
    4 RPS throttle and WS hub progress events. Unit-tested.
  - service/scanner.go: now invokes ffprobe per file and kicks the TMDb
    scraper in the background once a library scan finishes.
  - service/transcoder.go: per-media ffmpeg HLS job manager; outputs
    index.m3u8 + seg_NNNNN.ts under cache/hls/<id>; cancels jobs on
    shutdown; publishes 'transcode' WS events.
  - service/stream.go: serves HLS playlist (with 30s wait-for-ready) and
    .ts segments with path-traversal protection. Adds Probe() helper used
    by the admin 'reprobe' button.
  - service/image_proxy.go: cached, host-allow-listed reverse proxy for
    TMDb / Bangumi / Douban / Fanart / TheTVDB images so the SPA never
    hits a CORS or GFW issue.
  - service/playback.go: history upsert, favourites toggle, playlist CRUD
    + ordered items. RecentHistory joins with model.Media in one extra
    query so the home page can render a 'Continue Watching' row.
  - handler/streaming.go + handler/playback.go: REST endpoints for HLS,
    image proxy, scrape (one + library), reprobe, history, favourites,
    playlists.
  - handler/handler.go: registers /api/hls/:id/{index.m3u8,:seg}, /api/img,
    /api/history, /api/favourites/:id, /api/playlists/* with proper
    auth/admin guards.

Frontend
  - api/client.ts: imageURL() helper; hlsURL() endpoint; reuses the JWT in
    a query parameter for <video src> and <img src>.
  - api/playback.ts: typed helpers for history, favourites, playlists.
  - components/MediaCard.tsx: optional 'progress' prop renders a thin
    bottom progress bar, used by the new Continue Watching row.
  - pages/HomePage.tsx: two rows (Continue Watching + Recently Added);
    falls back to the empty-state hint when both are empty.
  - pages/PlayerPage.tsx: hls.js (lazy-imported) with auto-fallback to
    direct play; ?mode=hls|direct query toggle; resume position written
    every 10s while playing.
  - pages/MediaDetailPage.tsx: heart toggle + admin 'rescrape' / 'reprobe'
    buttons + dedicated 'HLS 转码播放' CTA.
  - pages/FavouritesPage.tsx, PlaylistsPage.tsx, PlaylistDetailPage.tsx:
    new screens.
  - components/Layout.tsx + App.tsx: sidebar links for Favourites and
    Playlists; routes are now lazily code-split via React.lazy + Suspense
    so the initial bundle stays at ~243 KB / 82 KB gzipped (hls.js is
    fetched only on first HLS playback).

Verified: go build, go vet, go test (incl. CleanQuery cases) all pass;
frontend tsc -b && vite build emits 9 route chunks plus a deferred hls
chunk.

internal/handler/handler.go

@@ -38,12 +38,36 @@ func Register(r *gin.Engine, cfg *config.Config, log *zap.Logger, svc *service.C
 			authed.POST("/libraries", middleware.AdminRequired(), createLibraryHandler(svc))
 			authed.DELETE("/libraries/:id", middleware.AdminRequired(), deleteLibraryHandler(svc))
 			authed.POST("/libraries/:id/scan", middleware.AdminRequired(), scanLibraryHandler(svc))
+			authed.POST("/libraries/:id/scrape", middleware.AdminRequired(), scrapeLibraryHandler(svc))
 
 			authed.GET("/libraries/:id/media", listMediaHandler(svc))
 			authed.GET("/media/:id", getMediaHandler(svc))
 			authed.GET("/media", searchMediaHandler(svc))
+			authed.POST("/media/:id/scrape", middleware.AdminRequired(), scrapeOneHandler(svc))
+			authed.POST("/media/:id/probe", middleware.AdminRequired(), reprobeHandler(svc))
 
+			// Streaming.
 			authed.GET("/stream/:id", streamHandler(svc))
+			authed.GET("/hls/:id/index.m3u8", hlsPlaylistHandler(svc))
+			authed.GET("/hls/:id/:seg", hlsSegmentHandler(svc))
+			authed.DELETE("/hls/:id", stopTranscodeHandler(svc))
+
+			// Image proxy (URL passed as ?url=...).
+			authed.GET("/img", imageProxyHandler(svc))
+
+			// History / favourites / playlists.
+			authed.GET("/history", recentHistoryHandler(svc))
+			authed.POST("/history", recordProgressHandler(svc))
+
+			authed.GET("/favourites", listFavouritesHandler(svc))
+			authed.POST("/favourites/:id", toggleFavouriteHandler(svc))
+
+			authed.GET("/playlists", listPlaylistsHandler(svc))
+			authed.POST("/playlists", createPlaylistHandler(svc))
+			authed.GET("/playlists/:id", getPlaylistHandler(svc))
+			authed.POST("/playlists/:id/items", addPlaylistItemHandler(svc))
+			authed.DELETE("/playlists/:id/items/:media_id", removePlaylistItemHandler(svc))
+			authed.DELETE("/playlists/:id", deletePlaylistHandler(svc))
 
 			authed.GET("/ws", wsHandler(svc))
 		}