feat: Implement playlist management routes and integrate with music player service

app/services/stream_processing_service.py

@@ -538,6 +538,7 @@ class StreamProcessingService:
         """Add a sound to the main playlist."""
         try:
             from app.models.playlist import Playlist
+            from app.services.music_player_service import music_player_service
 
             # Find the main playlist
             main_playlist = Playlist.find_main_playlist()
@@ -546,6 +547,9 @@ class StreamProcessingService:
                 # Add sound to the main playlist
                 main_playlist.add_sound(sound.id, commit=True)
                 logger.info(f"Added sound {sound.id} to main playlist")
+                
+                # Reload the playlist in music player if it's the current one
+                music_player_service.reload_current_playlist_if_modified(main_playlist.id)
             else:
                 logger.warning("Main playlist not found - sound not added to any playlist")