added port listener

app.js

@@ -7,6 +7,16 @@ dotenv.config();
 const app = express();
 const port = process.env.PORT; // Hugging Face will set this dynamically
 
+if (!port) {
+  console.error("❌ PORT not defined");
+  process.exit(1);
+}
+
+app.listen(port, () => {
+  console.log(`✅ Server listening on port ${port}`);
+});
+
+
 
 app.use(bodyParser.urlencoded({ extended: true }));
 app.use(express.static('public'));