- Add AdminSupportRoomSerializer, AdminSupportMessageSerializer, and user serialization utilities
- Implement AdminSupportRoomListView for listing and searching rooms with total unread counters
- Implement AdminSupportRoomByUserView for starting or opening rooms by user_id
- Implement AdminSupportRoomMessagesView for message retrieval and sending specialist responses
- Implement AdminSupportMessageDetailView for message editing and deletion
- Enforce staff/admin authorization with IsSupportAdminPanelUser permission
- Add SupportRoom and SupportMessage models with automated status and unread counters
- Implement API endpoints for message history, message sending, and unread checking
- Support guest session tracking and seamless room migration via X-Guest-Token
- Register SupportRoom and inline messages in Unfold admin dashboard
- Add initial migration 0001_initial and register app in settings and URLs