fix(webpack): write stub server file with ssr: false

[danielroe]

🔗 Linked issue

resolvesnuxt/nuxt#13986

❓ 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

Rollup needs to resolve #build/dist/server/server.mjs even though it will never be used/imported (src). This PR ensures the stub is present in webpack, just as it is in vite.

📝 Checklist

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

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[florian-lefebvre]

What about vite?

[danielroe]

@florian-lefebvre Are you experiencing an issue with vite? Do you have a link to an issue?

[florian-lefebvre]

Yes, looks like nuxt/nuxt#14114 is the same for vite

[pi0]

I think have a better universal solution for this using nitro. That's why put pending :)

[pi0]

Moving to #5773 using virtual imports.