chore: use cloudflare worker instead of vercel

apps/public/open-next.config.ts

@@ -0,0 +1,7 @@
+import { defineCloudflareConfig } from '@opennextjs/cloudflare';
+import staticAssetsIncrementalCache from '@opennextjs/cloudflare/overrides/incremental-cache/static-assets-incremental-cache';
+
+export default defineCloudflareConfig({
+  incrementalCache: staticAssetsIncrementalCache,
+  enableCacheInterception: true,
+});