new examples

node/react/README.md

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+# React
+
+A simple React example with Vite and React Router.
+
+## Getting Started
+
+```bash
+# Install dependencies
+npm install
+
+# Development
+npm run dev
+
+# Build for production
+VITE_BUILD_PUBLIC_VAR=your-value npm run build
+
+# Start production server
+npm run start
+```
+
+## Environment Variables
+
+This is a static site (SPA), so only build-time environment variables are supported:
+
+- `VITE_BUILD_PUBLIC_VAR` - Set during build, baked into the bundle