- Implemented HelpCommandHandler to handle the /help command.
- Added CommandMetadata struct to store command metadata.
- Registered new command handlers for GetCurrentSession, ListSessions, LoadSession, and SwitchSession.
- Updated existing command handlers to provide metadata for help command.
- Removed deprecated SessionQueryCommandHandler.
- Added new command handlers for listing sessions and loading sessions.
- Added topic management capabilities, allowing users to create, switch, and query topics within sessions.
- Updated command structure to include new commands: SwitchSession and GetCurrentSession.
- Introduced TopicRecord for managing topic data in the storage layer.
- Modified session handlers to accommodate topic operations, including listing and loading topics.
- Enhanced database schema to support topics, including new tables and relationships.
- Updated input adapters to recognize new commands and handle topic-related actions.
- Improved logging for session and topic operations to aid in debugging and monitoring.
- Removed the `format_session_list` function and related session handling from the client module.
- Simplified command output in the client by removing session-related commands.
- Introduced `ChannelInputAdapter` for parsing channel commands like `/new` and `/save`.
- Updated WebSocket handling to process commands via the new command system.
- Removed deprecated in-chat command handling from the gateway.
- Adjusted tests to reflect changes in command serialization and session handling.
- Enhanced session cleanup and job scheduling in the configuration module.
