Fix ASSETS_DIR path to correctly reference the assets directory

engine/audio_processor.py

@@ -43,7 +43,7 @@ class AudioProcessor:
     """
 
     # Default background music directory
-    ASSETS_DIR = Path(__file__).parent.parent / "data" / "assets"
+    ASSETS_DIR = Path(__file__).parent / "data" / "assets"
 
     def __init__(self, config: Optional[AudioProcessingConfig] = None):
         self.config = config or AudioProcessingConfig()