Deploy: Add Cloudflare Worker, D1 database integration, and updated README

- Add complete Cloudflare Worker implementation with waitlist API endpoints
- Integrate Cloudflare D1 SQLite database for production waitlist storage
- Add wrangler configuration for Worker deployment and D1 binding
- Rewrite README with comprehensive deployment and architecture documentation
- Update environment configuration and build setup
- Add waitlist utility functions and API client
- Update project dependencies and Vite configuration
- Deploy live to https://react-example.white-glade-ab2c.workers.dev

package.json

@@ -6,9 +6,10 @@
   "scripts": {
     "dev": "vite --port=3000 --host=0.0.0.0",
     "build": "vite build",
-    "preview": "vite preview",
+    "preview": "npm run build && wrangler dev",
     "clean": "rm -rf dist server.js",
-    "lint": "tsc --noEmit"
+    "lint": "tsc --noEmit",
+    "deploy": "npm run build && wrangler deploy"
   },
   "dependencies": {
     "@google/genai": "^2.4.0",
@@ -26,6 +27,8 @@
     "vite": "^6.2.3"
   },
   "devDependencies": {
+    "@cloudflare/vite-plugin": "^1.54.2",
+    "@types/express": "^4.17.21",
     "@types/node": "^22.14.0",
     "autoprefixer": "^10.4.21",
     "esbuild": "^0.25.0",
@@ -33,6 +36,6 @@
     "tsx": "^4.21.0",
     "typescript": "~5.8.2",
     "vite": "^6.2.3",
-    "@types/express": "^4.17.21"
+    "wrangler": "^4.127.1"
   }
 }