fix(web): pagefind.js missing on docs site

[ShiftWatchOut]

Issue for this PR

#36388
#17343
#26157 (comment)

Closes #36388

Type of change

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

What does this PR do?

Add routes.extend.exclude to the Cloudflare adapter configuration to explicitly exclude pagefind assets from Worker routing:

  adapter: cloudflare({
    imageService: "passthrough",
+   routes: {
+     extend: {
+       exclude: [{ pattern: "/docs/pagefind/*" }],
+     },
+   },
  }),

After fix the generated _routes.json exclude list now includes pagefind:

{
  "include": ["/*"],
  "exclude": ["/docs", "/docs/_astro/*", ..., "/docs/pagefind/*"]
}

How did you verify your code works?

I deployed a fixed version on CF, docs searching works fine, maybe more test needed.
doc site for testing

Checklist

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

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍