Generate app/env.d.ts and server/env.d.ts for Nuxt applications

[dario-piotrowicz]

Fixes #11727

Previously, only a top-level env.d.ts was created, which meant server files didn't receive Cloudflare types. Now the CLI generates separate app/env.d.ts and server/env.d.ts files, both importing from a shared _cloudflare/env.d.ts to avoid duplication.

This ensures Cloudflare types are available in both app and server directories.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
    • Run this PR's C3 prerelease to create a Nuxt application
    • Create an api/hello.ts file in the server directory with the following content:

      export default defineEventHandler((event) => {
         const { cloudflare } = event.context;
      
         return 'Hello';
      });

    • run the build script (that generates the Nuxt types)
    • ensure that the cloudflare context has the correct type (i.e. it is not an any nor unknown)
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: The types aspect of Nuxt is not part of our documentation: https://developers.cloudflare.com/workers/framework-guides/web-apps/more-web-frameworks/nuxt/

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---

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Latest commit: 87a5283

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commit: ea10dd4

[workers-devprod]

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• ✅ @cloudflare/wrangler

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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