Description

When using basename in react-router.config.ts, prerendered files are incorrectly output to a subfolder matching the basename (e.g., build/client/base/index.html instead of
build/client/index.html).

The basename is meant to define the deployment path prefix, not the build output directory structure. The prerender logic was using normalizedPath (which includes basename)
instead of the actual route path for determining output file locations.

Changes

• Use dataRequestPath instead of normalizedPath for .data file output paths
• Use prerenderPath instead of normalizedPath for HTML file output paths
• Use prerenderPath instead of normalizedPath for resource route output paths
• Add test for prerender with basename configuration

Impact

No compatibility issues - This is a bug fix that corrects the output path behavior. Previously, prerendered files with basename would be placed in wrong directories, causing
404 errors when deployed.

Fixes #14587