- Introduced a new `ChatHistoryMessageModel` to persist chat messages in the database.
- Implemented a migration script to create the `chat_history_messages` table.
- Enhanced chat services to support storing and retrieving chat history.
- Added functionality for generating multiple media assets in a single API call.
- Updated the chat UI to display assistant activities and tool usage more effectively.
- Refactored API calls to use absolute URLs for better reliability.
