feat(pages): routes HMR

[antfu]

🔗 Linked issue

❓ 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)
• [x] ✨ New feature (a non-breaking change that adds functionality)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This make adding/removing routes HMR, without requiring a full reload.

📝 Checklist

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

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[antfu]

/cc @posva 👀

[danielroe]

Thank you! This will be amazing 🚀

[danielroe]

@antfu I was checking this out but I think something must have changed elsewhere (maybe in vite or vite-node?) as the onUpdate function isn't getting called when a new page is added or changed. Do you have any idea what the issue might be?

edit: marking as draft until you get a chance to look at it, for easier triage