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/database/models.go

@@ -25,6 +25,8 @@ type Anime struct {
 	TitleEnglish  sql.NullString `json:"title_english"`
 	TitleJapanese sql.NullString `json:"title_japanese"`
 	Airing        sql.NullBool   `json:"airing"`
+	MagnetLink    sql.NullString `json:"magnet_link"`
+	TorrentHash   sql.NullString `json:"torrent_hash"`
 }
 
 type Session struct {