MCP support added

[errchh]

Completed Tasks:

• MCP dependencies and project structure setup
• Configuration system with models, loading, and validation
• MCP client with connection management and tool execution
• MCP manager for multi-server coordination and status tracking
• Chat integration with tool calls and approval workflow
• UI components for status display and management
• Error handling, logging, and monitoring
• Documentation and user guides
• Final integration and end-to-end testing

Remaining Tasks:

• Unit tests for MCP manager (4.3)
• Integration tests for chat with MCP (5.3)
• Error handling tests (7.3)
• Test MCP server creation and documentation (8.1)

The implementation is nearly complete with most core functionality working, missing some test coverage for comprehensive validation.