fix: removed hardcoded api url

frontend/src/services/apiClient.js

@@ -1,8 +1,10 @@
 import axios from "axios";
 import { useAuthStore } from "../stores/authStore";
 
+const runtimeOrigin = typeof window !== "undefined" ? window.location.origin : "";
+
 const apiClient = axios.create({
-    baseURL: import.meta.env.VITE_API_BASE_URL || "http://localhost:8080",
+    baseURL: runtimeOrigin,
     withCredentials: true,
 });