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/features/auth/use-auth.ts

@@ -0,0 +1,37 @@
+import type { User } from "@/domain/types"
+import { useAuthStorage } from "@/hooks/use-auth-storage"
+import apiClient from "@/services/api-client"
+import { useNavigate } from "@tanstack/react-router"
+import { useMutation } from "@tanstack/react-query"
+
+type LoginCredentials = {
+  usernameOrEmail: string
+  password: string
+}
+
+type LoginResponse = {
+  token: string
+  user: User
+}
+
+const login = async (credentials: LoginCredentials): Promise<LoginResponse> => {
+  const { data } = await apiClient.post('/auth/login', credentials)
+  return data
+}
+
+export const useLogin = () => {
+  const navigate = useNavigate()
+  const { setToken } = useAuthStorage()
+
+  return useMutation({
+    mutationFn: login,
+    onSuccess: (data) => {
+      setToken(data.token, data.user)
+      navigate({ to: '/' })
+    },
+    onError: (error) => {
+      console.error('Login failed:', error)
+      // TODO: Add user-facing error toast
+    },
+  })
+}