docs(mcp): stage OAuth-only search setup

[hmishra2250]

Summary

• prepare the hidden search-only MCP page for the OAuth-only endpoint
• remove raw API-key and key-in-path guidance
• retain hidden: true; do not publish or merge until the isolated-profile private/public canary passes

Validation

• reviewed the six-tool contract against MCP draft docs(locadex): update translations on main #332
• git diff --check

Depends on DB #242, Web #2944, MCP #332, and Infra #354.

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[hmishra2250]

Superseded by #1158 and the post-cutover verification. The merged connection page deliberately keeps /v2/mcp-search out of the general Firecrawl setup flow; this standalone search page would violate that source-of-truth guard. The OAuth-only search runtime has been verified after companion retirement.