- Added Z.AI web search provider with MCP integration for remote web search capabilities.
- Added 'zai' as a selectable web search provider option in settings and CLI.
- Added Z.AI to the automatic provider fallback chain for web search after Gemini and Codex.
- Implemented ZaiProvider class with support for multiple Z.AI API response formats and retry logic.
- Added comprehensive error handling and response parsing for Z.AI MCP endpoint integration.