- Introduced `HadisCollection` and `HadisInCollection` models to manage collections of hadis.
- Updated URL patterns to include new endpoints for collections and syncing hadis data.
- Enhanced admin interface to support management of hadis collections and their items.
- Added serializers for handling collections and syncing hadis data.
- Implemented a new API view for retrieving hadis statistics.
- Refactored existing serializers and views to accommodate new features and improve data handling.