Prerendered React Router v7 routes now served from static files

Patch Changes

• 744e96c: Serve React Router v7 prerendered routes from static HTML/data files instead of the SSR function.

  Previously, when react-router build ran with prerender() configured, the prerendered HTML and .data files were emitted into the build output but the per-route SSR function was still installed at the same logical paths, so the filesystem handle resolved requests to the function instead of the static files.

  The builder now scans the client output for prerender artifacts (<path>.html and index.html for the root) and, when found, skips the SSR function override and emits a pre-filesystem rewrite from /<path> to the prerendered HTML file. Routes that aren't prerendered continue to be served by the SSR function unchanged.