feat: add mcp server cli entry point

[cmgzn]

Add a complete MCP server CLI implementation and update the MCP documentation.

[gemini-code-assist]

Summary of Changes

Hello @cmgzn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the usability of the Data-Juicer MCP server by introducing a unified command-line interface (dj-mcp). This new CLI streamlines the process of launching the server in either granular-operators or recipe-flow modes, offering flexible transport options and improving the overall developer experience. The accompanying documentation updates provide clear, modern configuration examples, making it easier for users to integrate and deploy the MCP server.

Highlights

• Unified MCP Server CLI: A new command-line interface, dj-mcp, has been introduced to serve as a single entry point for launching the Data-Juicer MCP server.
• Dual Mode Support: The dj-mcp CLI now supports both granular-ops and recipe-flow modes, allowing users to select their desired server functionality directly from the command line.
• Flexible Transport Options: Users can specify various transport protocols, including stdio, sse, and streamable-http, through CLI arguments for enhanced deployment flexibility.
• Updated Documentation: The English and Chinese documentation for MCP server configuration has been comprehensively updated to reflect the new CLI, providing modern examples using uvx and uv for simplified setup.

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[gemini-code-assist]

Code Review

This pull request introduces a convenient CLI entry point dj-mcp for running the MCP server in either granular-ops or recipe-flow mode. The implementation is straightforward, and the accompanying documentation updates are clear and helpful, especially with the examples for uvx and uv. I've provided a few suggestions to improve the new CLI script's maintainability and argument handling, as well as a small refinement for the documentation to avoid potential user confusion. Overall, this is a great feature addition.