fix(nuxt): de-default layout/component imports

[danielroe]

🔗 Linked issue

resolves nuxt/nuxt#14827, resolves nuxt/nuxt#14350

❓ 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

When we were producing a single inlined file, we were not de-defaulting the exports.

So, for example, a default layout ended up resolving to { default: /* layout */ }, triggering a warning from vue that it had no render property. (The actual render property could have been accessed on layout.default.render.)

This completely broke all inlined targets (cloudflare, vercel-edge, netlify-edge) if you were using layouts or lazy components.

Adding interop defaults resolves the issue. I've gone ahead and done the same for lazy components and custom error components which were not mentioned in the original report, but had the same buggy behaviour in my testing.

Middleware doesn't need it as it is de-defaulted at point of use.

📝 Checklist

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

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