fix(ci): fix build-time nodemailer connection error and next.config warning

apps/web/next.config.mjs

@@ -54,4 +54,11 @@ const withMDX = createMDX({});
 
 // Clean, standard wrapper application
 // Rewrites are now handled by src/middleware.ts for maximum robustness
-export default withPayload(withMintelConfig(withMDX(nextConfig)));
+const config = withMintelConfig(withMDX(nextConfig));
+
+// Cleanup config to prevent Next.js 16 warnings about deprecated keys
+if (config.serverActions) {
+  delete config.serverActions;
+}
+
+export default withPayload(config);