feat: prerendering with vite preview server

[edmundhung]

RFC #14651

The diffs look huge but half of them are tests, as I am running the vite prerender tests with the new unstable flag as well to make sure both code paths work. The existing prerender logic is untouched. Happy to refactor if you would prefer consolidating them.

Feel free to review commit by commit. I have also added a /static route to the cloudflare playground as a working example.

Notes

• This introduces a standalone prerender plugin after discussing with Jacob and Mark. The plugin supports automatic retry and redirect following, but they are not enabled at the moment. Happy to remove them to keep the scope smaller.
• Added hasDefaultExport to route manifest to detect resource routes without loading server modules.
• For SPA mode, we now write the SPA shell as __spa-fallback.html first and rename it to index.html after prerendering if the index page is not prerendered.
• Since we are making real HTTP requests, passing loader data through headers might fail due to size limits. For routes with loader data larger than 8KB, we will omit the header and have the loader rerun again.

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