- Added subscription_service.py for managing subscriptions with functions to create, read, update, and delete subscriptions.
- Added tenant_service.py for managing tenants with functions to create, read, update, delete tenants, and assign users to tenants.
- Added user_service.py for managing users with functions to create, read, update, and delete users.
- Created tests for business types, plans, subscriptions, tenants, and users, ensuring proper functionality and error handling.
- Implemented pagination in user listing and included user profiles in responses.
- Established fixtures for database setup and teardown in tests.
