Support local explorer /cdn-cgi/ routes

[jamesopstad]

Support local explorer /cdn-cgi/ routes

The local explorer UI can now be accessed at /cdn-cgi/explorer.

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• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows: tested that it works with the X_LOCAL_EXPLORER=true environment variable
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: N/A

A picture of a cute animal (not mandatory, but encouraged)

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[changeset-bot]

🦋 Changeset detected

Latest commit: 963768a

The changes in this PR will be included in the next version bump.

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[workers-devprod]

Codeowners approval required for this PR:

• ✅ @cloudflare/wrangler

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[github-actions]

⚠️ Issues found

File: .changeset/bumpy-suns-press.md

Issue: Insufficient changelog description (body too thin)

The changeset body is a single sentence that largely repeats the title:

Title: Support local explorer /cdn-cgi/ routes
Body: The local explorer UI can now be accessed at /cdn-cgi/explorer.

Per the guidelines, the body should be "one or more paragraphs explaining the reason for the change and anything notable about the approach. Aim for more than one sentence but less than three paragraphs." A one-liner that restates the title doesn't meet that bar.

The body should explain:

• Why this route was added (motivation/context)
• Any notable details about the implementation or behavior (e.g. is this only available in local dev? Does it require any configuration?)
• Optionally, a short usage example showing how to navigate to the explorer

Everything else looks fine:

• Version type (minor) is correct for a new feature
• No h1/h2/h3 headers
• Correct package (@cloudflare/vite-plugin)
• No analytics concerns

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commit: 55cacf2