Add auth service with login/logout

frontend/src/api/auth.ts

@@ -0,0 +1,46 @@
+import api from './axios';
+
+export interface LoginRequest {
+  username: string;
+  password: string;
+}
+
+export interface LoginResponse {
+  access_token: string;
+  token_type: string;
+}
+
+export interface User {
+  id: number;
+  username: string;
+  email: string;
+  full_name: string;
+  is_admin: boolean;
+  is_active: boolean;
+}
+
+export const authService = {
+  async login(credentials: LoginRequest): Promise<LoginResponse> {
+    const formData = new URLSearchParams();
+    formData.append('username', credentials.username);
+    formData.append('password', credentials.password);
+
+    const response = await api.post<LoginResponse>('/api/v1/auth/login', formData, {
+      headers: {
+        'Content-Type': 'application/x-www-form-urlencoded',
+      },
+    });
+    return response.data;
+  },
+
+  async getCurrentUser(): Promise<User> {
+    const response = await api.get<User>('/api/v1/auth/me');
+    return response.data;
+  },
+
+  logout() {
+    localStorage.removeItem('token');
+    localStorage.removeItem('user');
+    window.location.href = '/login';
+  },
+};