refactor: Improve code readability by formatting function signatures and descriptions

app/services/dashboard.py

@@ -13,7 +13,11 @@ logger = get_logger(__name__)
 class DashboardService:
     """Service for dashboard statistics and analytics."""
 
-    def __init__(self, sound_repository: SoundRepository, user_repository: UserRepository) -> None:
+    def __init__(
+        self,
+        sound_repository: SoundRepository,
+        user_repository: UserRepository,
+    ) -> None:
         """Initialize the dashboard service."""
         self.sound_repository = sound_repository
         self.user_repository = user_repository