- Updated the `CHAT_STORAGE_DESIGN.md` to define the `ChatStore` and `AssistantStore` interfaces, providing clear operations for managing chats, messages, resumes, and assistants.
- Introduced new methods for creating, retrieving, updating, and deleting chats and assistants, along with batch operations for messages and resumes.
- Enhanced the documentation to clarify the responsibilities of each store interface and the associated data structures, ensuring better understanding for future development.
- Revised related functions and tests to support the new design, reinforcing the integrity and performance of chat interactions and assistant management.
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