fix(cloudflare): use explicit imports in dev plugin instead of #imports

[vinayakkulkarni]

Summary

The Cloudflare dev plugin (plugin.dev.ts) imports useRuntimeConfig and getRequestURL from #imports, which is a virtual module that depends on Nitro's auto-import system being enabled.

When used with Nuxt's compatibilityVersion: 5 (which sets nitroAutoImports: false by default), the #imports virtual module is never created, causing the dev server to fail:

[nitro] ERROR Error: Could not load .nuxt/imports
  (imported by nitropack/dist/presets/cloudflare/runtime/plugin.dev.mjs):
  ENOENT: no such file or directory, open '.nuxt/imports'

Root Cause

1. Nuxt compatibilityVersion: 5 defaults nitroAutoImports to false (source)
2. This passes imports: false to Nitro, disabling the unimport system entirely
3. The #imports virtual module (nitro.options.virtual["#imports"]) relies on nitro.unimport?.toExports() which returns empty or is never registered
4. The Cloudflare dev plugin is the only preset plugin in Nitro that imports from #imports — all other 50+ preset plugins don't use it

Fix

Replace #imports with explicit imports from nitropack/runtime and h3, consistent with how other Nitro runtime files already import these utilities:

- // @ts-ignore
- import { useRuntimeConfig, getRequestURL } from "#imports";
+ import { useRuntimeConfig } from "nitropack/runtime";
+ import { getRequestURL } from "h3";

Also updated NitroAppPlugin type import from "nitropack" to "nitropack/types" for consistency with other runtime files (e.g., src/runtime/internal/plugin.ts).

Reproduction

• Repro repo: https://github.com/vinayakkulkarni/nuxt-cloudflare-imports-bug
• Nuxt issue: Nitro cloudflare dev plugin fails to resolve #imports with compatibilityVersion: 5 + compatibilityDate: 'latest' nuxt/nuxt#34282

Minimal config that triggers the bug (all three required):

export default defineNuxtConfig({
  future: { compatibilityVersion: 5 },
  compatibilityDate: 'latest',
  nitro: { preset: 'cloudflare-pages' },
});

Workaround (until this fix is released):

export default defineNuxtConfig({
  experimental: {
    nitroAutoImports: true, // Override the v5 default
  },
});

Closes nuxt/nuxt#34282

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