Add Cloudflare Workers deploy config via OpenNext

- Fix build:worker script to use opennextjs-cloudflare build
- Add open-next.config.ts required by OpenNext Cloudflare
- Update wrangler.toml main entry to .open-next/worker.js
- Ignore .open-next/ and .wrangler/ build artifacts

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

package.json

@@ -6,7 +6,10 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "build:worker": "bunx opennextjs-cloudflare build",
+    "preview": "wrangler dev",
+    "deploy": "bun run build:worker && wrangler deploy"
   },
   "dependencies": {
     "@base-ui/react": "^1.4.1",
@@ -31,6 +34,8 @@
     "eslint": "^9",
     "eslint-config-next": "16.2.5",
     "tailwindcss": "^4",
-    "typescript": "^5"
+    "typescript": "^5",
+    "@opennextjs/cloudflare": "latest",
+    "wrangler": "^4.90.0"
   }
 }