fix(vite): prevent overlap between vite assets and app routes

[danielroe]

🔗 Linked issue

resolves nuxt/nuxt#15052

❓ 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

As is, /app will render /app.vue. (The base config option is completely ignored - and in fact removed by vite - so no need to do the same ourselves.) A workaround is to inject and remove a random string to bypass matching vite-handled paths.

📝 Checklist

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

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