fix(nuxt): narrow nuxt.config import protection

[danielroe]

🔗 Linked issue

resolves nuxt/nuxt#14461

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This narrows down import protection for nuxt.config. Vite will pass the id /nuxt.config.ts even when aliased or relative imports are used. Webpack will pass the full ID so it's possible to devise imports that won't be caught (but the import of defineNuxtConfig from nuxt will be caught).

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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