feat: refactor frontend routing and authentication

- Changed root div ID from 'root' to 'app' in index.html.
- Updated package.json to include new dependencies for routing and state management.
- Removed App component and replaced it with a router setup in main.tsx.
- Added route definitions for login, about, and index pages.
- Implemented authentication logic using Zustand for state management.
- Created API client with Axios for handling requests and token management.
- Added CORS support in the backend API.
- Updated schema for login requests to use camelCase.

libertas-frontend/src/services/api-client.ts

@@ -0,0 +1,33 @@
+import axios from 'axios'
+import { useAuthStorage } from '@/hooks/use-auth-storage'
+
+
+const apiClient = axios.create({
+  baseURL: 'http://localhost:8080/api/v1',
+})
+
+apiClient.interceptors.request.use(
+  (config) => {
+    const token = useAuthStorage.getState().token
+    if (token) {
+      config.headers.Authorization = `Bearer ${token}`
+    }
+    return config
+  },
+  (error) => {
+    return Promise.reject(error)
+  },
+)
+
+apiClient.interceptors.response.use(
+  (response) => response,
+  (error) => {
+    if (error.response && error.response.status === 401) {
+      useAuthStorage.getState().clearToken()
+      window.location.reload()
+    }
+    return Promise.reject(error)
+  },
+)
+
+export default apiClient