Add speedy-router

[anonrig]

Please make sure all the requirements are satisfied, otherwise the PR could be closed without further notice.

Adds speedy-router to Plugins → React → Routing.

speedy-router is a from-scratch React 19.2 router with the TanStack Router API, plus speedy-router-plugin for Vite routeTree.gen.ts generation.

Checklist

• Title as described.
• Make sure you put things in the right category.
• The description of your item should be a sentence with less than 24 words.
• Avoid using links and parentheses in description.
• Omit unnecessary words already provided in the context (e.g. for Vite, a Vite plugin).
• Use proper case for terms (e.g. GitHub, TypeScript, ESLint, etc.)
• When mentioning tools, omit versions whenever possible.
• When mentioning package names, use quotes whenever possible.
• Always add your items to the end of a list.

Plugins/Tools

• The plugin/tool is working with Vite 2.x and onward.
• The project is Open Source.
• The project follows the Vite Plugins Conventions.
• The plugin uses Vite-specific hooks and can't be implemented as a Compatible Rollup Plugin.
• The repo should be at least 30 days old.
• The documentation is in English.
• The project is active and maintained.
• The project accepts contributions.
• Not a commercial product.

Note: the listed repo is the router monorepo (includes speedy-router-plugin). It is newer than 30 days.