feat(desktop): autodetect React Router framework

[akazwz]

Summary

• detect React Router framework mode via @react-router/dev before falling through to generic Vite detection
• generate a static build/client entrypoint for React Router SPA mode (ssr: false) with an HTML fallback
• generate an SSR entrypoint that serves build/client assets first, then routes requests through React Router's createRequestHandler
• include React Router in the deno compile . and deno desktop . supported framework messages

Docs PR: denoland/docs#3361

Notes

React Router's default server entry uses Node's renderToPipeableStream; projects building with Deno need to provide a Web Streams-compatible app/entry.server.tsx using renderToReadableStream. The generated runtime entrypoint assumes the project has already built successfully with Deno.

Testing

• cargo fmt --check
• git diff --check
• cargo test -p deno react_router --lib -- --nocapture (fails before running tests in this local checkout because clang rejects the configured -fuse-ld=lld linker flag)
• deno task build in a React Router SPA sample
• React Router SSR build in a temp sample with a Web Streams-compatible app/entry.server.tsx, plus manual handler/static-asset smoke checks

[deno-cla-assistant]

Deno Individual Contributor License Agreement

All contributors have signed the CLA. Thank you!

• @akazwz

Re-run CLA check

---

This is an automated message from CLA Assistant

[crowlKats]

@akazwz thanks for the PR; could you get CI to pass?

[akazwz]

Thanks for the heads up! I updated the framework detection golden output, and CI is green now.