umbennen von frontend zu frontend

frontend/src/services/api.js

@@ -0,0 +1,13 @@
+import axios from 'axios';
+
+const instance = axios.create({
+  baseURL: import.meta.env.VITE_API_URL || 'http://localhost:5000/api',
+});
+
+instance.interceptors.request.use(config => {
+  const token = localStorage.getItem('token');
+  if (token) config.headers.Authorization = `Bearer ${token}`;
+  return config;
+});
+
+export default instance;