feat: add YouTube provider for lossy downloads via Cobalt API

- New YouTube download provider with Opus 256kbps and MP3 320kbps options
- SongLink/Odesli integration for Spotify/Deezer ID to YouTube URL conversion
- YouTube video ID detection for YT Music extension compatibility
- Parallel cover art and lyrics fetching during download
- Queue progress shows bytes (X.X MB) for streaming downloads
- Full metadata embedding: cover, lyrics, title, artist, album, track#, disc#, year, ISRC
- Removed Tidal HIGH (lossy AAC) option - use YouTube for lossy instead
- Bumped version to 3.6.0

android/app/src/main/kotlin/com/zarz/spotiflac/MainActivity.kt

@@ -1927,6 +1927,15 @@ class MainActivity: FlutterFragmentActivity() {
                             }
                             result.success(response)
                         }
+                        "downloadFromYouTube" -> {
+                            val requestJson = call.arguments as String
+                            val response = withContext(Dispatchers.IO) {
+                                handleSafDownload(requestJson) { json ->
+                                    Gobackend.downloadFromYouTube(json)
+                                }
+                            }
+                            result.success(response)
+                        }
                         "enrichTrackWithExtension" -> {
                             val extensionId = call.argument<String>("extension_id") ?: ""
                             val trackJson = call.argument<String>("track") ?: "{}"