feat: add MCPClient for managing connections to MCP servers and modify app launch parameters.

feat: Introduce Gradio UI for interactive query and expiry sweep, add a multi-server MCP client, and simplify app startup to directly launch Gradio.

feat: Introduce `MCPClient` for multi-server communication and integrate with FastAPI lifespan events.

feat: Add Gradio UI for interactive query and expiry sweep agents, integrated with FastAPI and uvicorn.

feat: Add Gradio application entry point with MCP client and Hugging Face Spaces configuration.