feat: torrent streaming with hls transcoding (#1)

* feat: add ffmpeg for hls streaming

* feat: torrent streaming with hls transcoding

- add nyaa.si torrent search client
- add streaming service using anacrolix/torrent
- add hls transcoding via ffmpeg for browser playback
- add watch page with episode selection
- add socks5 proxy support via TORRENT_PROXY env
- switch to modernc.org/sqlite (pure go, no cgo conflicts)
- update dockerfile with ffmpeg

internal/server/routes.go

@@ -1,7 +1,9 @@
 package server
 
 import (
+	"log/slog"
 	"net/http"
+	"os"
 
 	"mal/internal/database"
 	"mal/internal/features/anime"
@@ -9,6 +11,7 @@ import (
 	"mal/internal/features/watchlist"
 	"mal/internal/jikan"
 	"mal/internal/shared/middleware"
+	"mal/internal/streaming"
 )
 
 type Config struct {
@@ -28,6 +31,13 @@ func NewRouter(cfg Config) http.Handler {
 	animeSvc := anime.NewService(cfg.JikanClient, cfg.DB)
 	animeHandler := anime.NewHandler(animeSvc)
 
+	logger := slog.New(slog.NewTextHandler(os.Stderr, nil))
+	streamSvc, err := streaming.NewService(logger)
+	if err != nil {
+		panic("failed to initialize streaming service: " + err.Error())
+	}
+	streamHandler := streaming.NewHandler(streamSvc, cfg.JikanClient)
+
 	// Serve static files
 	fs := http.FileServer(http.Dir("./static"))
 	mux.Handle("/static/", http.StripPrefix("/static/", fs))
@@ -39,7 +49,8 @@ func NewRouter(cfg Config) http.Handler {
 	mux.HandleFunc("/api/search-quick", animeHandler.HandleQuickSearch)
 	mux.HandleFunc("/api/catalog", animeHandler.HandleAPICatalog)
 	mux.HandleFunc("/anime/", animeHandler.HandleAnimeDetails)
-	mux.HandleFunc("/api/anime/", animeHandler.HandleAPIAnimeRelations)
+	mux.HandleFunc("/api/anime/{id}/relations", animeHandler.HandleAPIAnimeRelations)
+	mux.HandleFunc("/api/anime/{id}/episodes", animeHandler.HandleAPIAnimeEpisodes)
 
 	// Auth Endpoints
 	mux.HandleFunc("/login", func(w http.ResponseWriter, r *http.Request) {
@@ -51,6 +62,9 @@ func NewRouter(cfg Config) http.Handler {
 	})
 	mux.HandleFunc("/logout", authHandler.HandleLogout)
 
+	// Streaming endpoints
+	streamHandler.RegisterRoutes(mux)
+
 	// Watchlist POST endpoint (Protected)
 	mux.Handle("/api/watchlist/export", middleware.RequireAuth(http.HandlerFunc(watchlistHandler.HandleExportWatchlist)))
 	mux.Handle("/api/watchlist/import", middleware.RequireAuth(http.HandlerFunc(watchlistHandler.HandleImportWatchlist)))