Removed the MCP service section

We have removed all MCP (Model Context Protocol) related content from the site. The "toolbox" positioning works best as a pure collection of online tools, and the MCP side felt out of place.

What was removed

• The MCP docs section (/docs/mcp/toolbox-mcp) in all four languages, including its sidebar category.
• The "MCP 服务" navbar and footer entries.
• The MCP watermark tool and its page, which only existed as an MCP demo.
• MCP mentions in tool pages: the Cron page's MCP section, the Image Base64 page's MCP tag and feature bullet, and the MCP link on the intro page.
• Related plumbing: the mcp category definition in the tool generator, the OG image for the MCP page, and all orphaned MCP translation keys.

Nothing changes for the tools themselves — all 70+ online tools keep working exactly as before. If you had configured the Toolbox MCP server in an AI assistant, that endpoint is no longer advertised on the site.

Found something we missed? Let us know in the comments below.