feat: 添加用户认证功能，包括登录、注册、GitHub/Gitee OAuth集成及相关路由配置。

src/router/index.tsx

@@ -15,6 +15,7 @@ import TaxCalculatorPage from '../pages/TaxCalculatorPage';
 import Login from '../pages/Login/Login';
 import Profile from '../pages/Profile';
 import GitHubCallback from '../pages/GitHubCallback';
+import GiteeCallback from '../pages/GiteeCallback';
 import Notifications from '../pages/Notifications';
 import Layout from '../components/common/Layout';
 import ProtectedRoute from '../components/common/ProtectedRoute';
@@ -36,6 +37,10 @@ export const router = createBrowserRouter([
     path: '/auth/github/callback',
     element: <GitHubCallback />,
   },
+  {
+    path: '/auth/gitee/callback',
+    element: <GiteeCallback />,
+  },
   {
     path: '/',
     element: <ProtectedRoute><Layout /></ProtectedRoute>,