refactor: serve static frontend with Go APIs

scripts/print-app-info.mjs

@@ -11,8 +11,8 @@ console.log(JSON.stringify({
   appId: 'zhinian-web-studio',
   packageName: pkg.name,
   version: pkg.version,
-  runtime: 'Next.js Web',
-  webOnly: true,
+  runtime: 'Static Next.js export on Nginx + Go API',
+  webOnly: false,
   primaryRoutes: [
     '/',
     '/create',