- Introduced `auto_channel_sync` and `auto_sync_channel_start` fields in the ChannelGroupM3UAccount model.
- Added API endpoint to update M3U group settings.
- Updated M3UGroupFilter component to manage auto sync settings.
- Enhanced M3URefreshNotification and M3U components for better user guidance.
- Created a Celery task for automatic channel synchronization after M3U refresh.