Fix: use dynamix API URL

frontend/index.html

@@ -380,7 +380,7 @@
     </div>
 
     <script>
-        const API_URL = 'http://localhost:8000';
+        const API_URL = window.location.origin; // 'http://localhost:8000';
 
         // Upload handlers
         const uploadArea = document.getElementById('uploadArea');