Bug: `vite start` silently serves broken dev server

[gurza]

Running vite start (as opposed to vite preview) after vite build starts a Vite dev server that returns 404 for all routes with no error or warning. Since start is not a recognized Vite CLI subcommand (Vite CLI docs), Vite silently falls back to the default dev command - but without proper TanStack Start SSR integration, every request gets a 404 with an empty body.

Steps to Reproduce

1. Run pnpm build && pnpm start
2. Open http://localhost:5173/ - get a 404

Workaround

Change the script to "start": "vite preview".