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/shared/middleware/auth.go

@@ -61,10 +61,12 @@ func RequireAuth(next http.Handler) http.Handler {
 // RequireGlobalAuth ensures that a valid user is in the context for all routes except login and static
 func RequireGlobalAuth(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		// Allow unauthenticated access to login, search, and static files
+		// Allow unauthenticated access to login, search, static files, and streaming
 		if r.URL.Path == "/login" || strings.HasPrefix(r.URL.Path, "/static/") ||
 			r.URL.Path == "/search" || r.URL.Path == "/api/search" || r.URL.Path == "/api/search-quick" ||
-			r.URL.Path == "/" {
+			r.URL.Path == "/" ||
+			strings.HasPrefix(r.URL.Path, "/watch/") || strings.HasPrefix(r.URL.Path, "/api/stream/") ||
+			strings.HasPrefix(r.URL.Path, "/anime/") || strings.HasPrefix(r.URL.Path, "/api/anime/") {
 			next.ServeHTTP(w, r)
 			return
 		}