Refactor backend to adopt async patterns across services, API routes, and CRUD operations
- Migrated database sessions and operations to `AsyncSession` for full async support. - Updated all service methods and dependencies (`get_db` to `get_async_db`) to support async logic. - Refactored admin, user, organization, session-related CRUD methods, and routes with await syntax. - Improved consistency and performance with async SQLAlchemy patterns. - Enhanced logging and error handling for async context.
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