feat: add `frontend-remix` module

[ronak-create]

Summary

Add Remix as a frontend option — a full-stack React framework with a loader/action model and native web standards API.

Why

Remix occupies a distinct position from Next.js: it's preferred for form-heavy apps, multi-step flows, and projects where web platform primitives (Request/Response, FormData) are a first-class concern.
It also has first-class Cloudflare Workers and Bun support.

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Files to generate

• app/root.tsx — root layout with Links, Meta, Outlet
• app/routes/_index.tsx — index route with loader example
• remix.config.js / vite.config.ts (Remix Vite mode)
• tsconfig.json
• .env.example

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Implementation hints

• Remix has two modes:

  • classic (remix.config.js)
  • new Vite plugin (@remix-run/dev v2.x)
    → target the Vite plugin mode (recommended)

• Key dependencies:

  • @remix-run/react
  • @remix-run/node
  • @remix-run/dev
  • vite

• When deployment-cloudflare is also selected:

  • switch adapter to @remix-run/cloudflare
  • implement via onBeforeCompose hook inspecting selections

• Conflicts with:

  • other frontend modules

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Contributor guidance

Refer to CONTRIBUTING.md → "Adding a New Module"

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Acceptance criteria

• foundation create lists Remix as a frontend option
• Generated project runs remix vite:dev without errors
• tsconfig.json satisfies Remix's path requirements
• Snapshot test added