deploy en-us e unit tests melhorado

backend/server.js

@@ -85,6 +85,10 @@ app.post('/api/contact', async (req, res) => {
     }
 });
 
-app.listen(PORT, () => {
-    console.log(`[Apex Server] Running on port ${PORT}`);
-});
+// Export the app for testing, but only listen if run directly
+if (require.main === module) {
+    app.listen(PORT, () => {
+        console.log(`[Apex Server] Running on port ${PORT}`);
+    });
+}
+module.exports = app;