Refactor scheduled task repository and schemas for improved type hints and consistency

- Updated type hints from List/Optional to list/None for better readability and consistency across the codebase.
- Refactored import statements for better organization and clarity.
- Enhanced the ScheduledTaskBase schema to use modern type hints.
- Cleaned up unnecessary comments and whitespace in various files.
- Improved error handling and logging in task execution handlers.
- Updated test cases to reflect changes in type hints and ensure compatibility with the new structure.

app/services/vlc_player.py

@@ -238,13 +238,13 @@ class VLCPlayerService:
             return
 
         logger.info("Recording play count for sound %s", sound_id)
-        
+
         # Initialize variables for WebSocket event
         old_count = 0
         sound = None
         admin_user_id = None
         admin_user_name = None
-        
+
         try:
             async with self.db_session_factory() as session:
                 sound_repo = SoundRepository(session)