docs: add iFlow Search MCP server example

[zhengyanglsun]

Issue for this PR

Closes #

No tracking issue — the Examples section of mcp-servers.mdx explicitly invites PRs that document additional MCP servers, so I went straight to a PR per that guidance.

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Adds one new example block, ### iFlow Search, to the Examples section of packages/web/src/content/docs/mcp-servers.mdx, right after the existing Grep by Vercel example.

iFlow Search is a community/third-party MCP stdio server published on npm as @iflow-ai/search-mcp and listed in the MCP Registry as io.github.zhengyanglsun/iflow-search. It exposes three tools:

• iflow_web_search
• iflow_image_search
• iflow_web_fetch

The new section mirrors the structure of the existing Sentry / Context7 / Grep by Vercel entries: short description with links, an opencode.json snippet, and a usage hint. It uses the stable npm package (npx -y @iflow-ai/search-mcp) and a type: "local" mcp block, which matches the existing @modelcontextprotocol/server-everything stdio example already in the page.

Security choices made deliberately so users don't accidentally commit a credential:

• The IFLOW_API_KEY is not placed in opencode.json. The docs tell users to export it in the shell (or pull from a secret manager) that launches OpenCode.
• The environment block in the example only carries a non-secret attribution value (IFLOW_MCP_CLIENT: "opencode").
• The shell example uses the placeholder YOUR_IFLOW_API_KEY, not a real key.

No runtime code changes; this is docs-only. No implied OpenCode endorsement — the section is labeled community/third-party.

How did you verify your code works?

• Read the file end-to-end and aligned the new block with the existing example sections (Sentry / Context7 / Grep by Vercel / @modelcontextprotocol/server-everything) so that headings, code fences, file-title hints, and highlight ranges follow the same pattern.
• git diff --check — clean (no whitespace errors).
• git diff --stat — change is scoped to one file: packages/web/src/content/docs/mcp-servers.mdx (+34 / -0).
• Manual secret scan over the diff for sk-, ghp_, github_pat_, npm_, Bearer <token>, real IFLOW_API_KEY=... literals, and tunnel URLs (trycloudflare.com, ngrok.io) — only the placeholder YOUR_IFLOW_API_KEY is present.
• Upstream PR CI passed: check-standards, check-compliance, check-duplicates, add-contributor-label are all green.
• I did not run astro build locally for the packages/web site — the change is structurally identical to the three existing example blocks already in the same file, and pulling the full Astro / Starlight / Cloudflare adapter toolchain just to re-render a prose addition felt disproportionate. Happy to run the build if a maintainer prefers.

Screenshots / recordings

N/A — text-only docs addition, no UI change.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

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