fix: new Request(request, init) crashing in route handlers on workerd

[ama2369]

Summary

Fixes #1144. Likely also fixes #1037.

new Request(request, { headers }) in route handlers crashes with TypeError: Invalid URL: [object Request] because the request object isn't recognized as a native Request by workerd's constructor.

The fix captures OriginalRequest before overwriting globalThis.Request, adds an instanceof guard, and extracts .url with merged properties for non-native objects.

What changed

packages/cloudflare/src/cli/templates/init.ts

• Capture OriginalRequest before replacement for reliable instanceof checks
• String, URL, and OriginalRequest instances pass through to super() directly
• Non-native objects: extract .url, merge method/headers/body into init, set duplex: "half" when body is present

Test plan

• String and URL inputs still work
• new Request(request, { headers }) works in route handlers (the bug)
• Method, headers, and body are preserved through the non-native path
• stream.Readable body conversion still works (existing behavior)

[changeset-bot]

🦋 Changeset detected

Latest commit: 5f2ef56

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

This PR includes changesets to release 1 package

Name	Type
@opennextjs/cloudflare	Patch

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