Add Cloudflare Workers configuration

package.json

@@ -10,8 +10,9 @@
     "build": "tsc -b && vite build",
     "start": "node --env-file=.env server.js",
     "lint": "eslint .",
-    "preview": "vite preview",
-    "chatbot:eval": "node scripts/evaluate-chatbot.mjs"
+    "preview": "npm run build && wrangler dev",
+    "chatbot:eval": "node scripts/evaluate-chatbot.mjs",
+    "deploy": "npm run build && wrangler deploy"
   },
   "dependencies": {
     "express": "^5.2.1",
@@ -23,6 +24,7 @@
     "resend": "^6.10.0"
   },
   "devDependencies": {
+    "@cloudflare/vite-plugin": "^1.35.0",
     "@eslint/js": "^9.39.4",
     "@types/node": "^24.12.0",
     "@types/react": "^19.2.14",
@@ -35,6 +37,7 @@
     "globals": "^17.4.0",
     "typescript": "~5.9.3",
     "typescript-eslint": "^8.56.1",
-    "vite": "^8.0.0"
+    "vite": "^8.0.0",
+    "wrangler": "^4.87.0"
   }
 }