fix typo for storage stats interface

backend/app/api/settings.py

@@ -16,7 +16,7 @@ bp = Blueprint("settings", __name__)
 def get_storage_stats():
     """Calculate storage statistics for the downloads directory."""
     config = get_settings()
-    downloads_path = Path(config.downloads_path)
+    downloads_path = Path(config.download_path)
 
     if not downloads_path.exists():
         return {"total_size": 0, "total_size_formatted": "0 B", "file_count": 0}