Lyrics and favorites improvements

- Fix unsynced lyrics displaying all at 0:00 by omitting Start field
- Improve LRC parsing with fuzzy search and synced lyrics preference
- Add DeleteAsync to proxy service for proper auth forwarding
- Support both /UserFavoriteItems and /Users/{userId}/FavoriteItems routes
- Fix favorite endpoints to properly forward authentication
- Add comprehensive logging for debugging
- Extend Spotify sync backward search window to 24 hours

.env.example

@@ -30,6 +30,12 @@ MUSIC_SERVICE=SquidWTF
 # Path where downloaded songs will be stored on the host (only applies if STORAGE_MODE=Permanent)
 DOWNLOAD_PATH=./downloads
 
+# Path where favorited external tracks are permanently kept
+KEPT_PATH=./kept
+
+# Path for cache files (Spotify missing tracks, etc.)
+CACHE_PATH=./cache
+
 # ===== SQUIDWTF CONFIGURATION =====
 # Different quality options for SquidWTF. Only FLAC supported right now
 SQUIDWTF_QUALITY=FLAC