Implement native Vinext route-aware type generation

[pacexy]

Summary

Vinext currently has an optional dev-time bridge that can run when Next.js is installed locally. That improves developer experience in the short term, but it should not be the long-term solution.

Vinext already scans the route tree internally via and . We should use that data to generate the route-aware files directly, without depending on Next.js.

Goal

Implement native Vinext type generation for helpers such as and , so route-aware typing no longer depends on or a local Next.js install.

Notes

• The current integration is intended as a temporary stopgap for developer experience.
• The native implementation should preserve Vinext's positioning as a Vite-based reimplementation rather than requiring the real Next.js package.