Implemented the ability to restore previous versions of metrics and dashboards through the chat interface. Key changes include:
- Created restore_chat_handler.rs to handle the restoration logic
- Added a new REST endpoint at PUT /chats/{id}/restore
- Updated module exports for the new functionality
- Added comprehensive integration tests
- Updated PRDs with implementation details
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>