fix(nuxt): augment nitro config within server context as well

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Because the server context is now more separated from the nuxt one, our auto-generated schema.d.ts file isn't included in the server directory context (if users are using the ~/server/tsconfig.json file).

This ensures the augmentations are applied there as well.

📝 Checklist

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