feat(task1): restructure directories for turborepo monorepo

- Move backend/ to apps/server/ via git mv
- Move frontend/ to apps/admin/ via git mv
- Create packages/typescript-config/ with base, nestjs, and react-vite presets

apps/admin/src/pages/Login/index.tsx

@@ -0,0 +1,54 @@
+import React, { useState } from 'react';
+import { useNavigate } from 'react-router-dom';
+import { Form, Input, Button, Card, message, Typography } from 'antd';
+import { UserOutlined, LockOutlined } from '@ant-design/icons';
+import api from '../../api';
+
+const { Title } = Typography;
+
+const LoginPage: React.FC = () => {
+  const [loading, setLoading] = useState(false);
+  const navigate = useNavigate();
+
+  const onFinish = async (values: any) => {
+    setLoading(true);
+    try {
+      const res: any = await api.post('/auth/login', values);
+      localStorage.setItem('token', res.access_token);
+      localStorage.setItem('user', JSON.stringify(res.user));
+      localStorage.setItem('permissions', JSON.stringify(res.user.permissions || []));
+      message.success('登录成功');
+      navigate('/dashboard');
+    } catch (err: any) {
+      message.error(err?.message || '登录失败');
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div style={{ minHeight: '100vh', display: 'flex', alignItems: 'center', justifyContent: 'center', background: '#f5f5f7' }}>
+      <Card style={{ width: 400, borderRadius: 16, boxShadow: '0 4px 24px rgba(0,0,0,0.08)', border: 'none' }}>
+        <div style={{ textAlign: 'center', marginBottom: 32 }}>
+          <Title level={3} style={{ margin: 0, fontWeight: 600, color: '#1d1d1f' }}>恭学教育基地管理系统</Title>
+          <p style={{ color: '#86868b', marginTop: 8 }}>水电费精准计费平台</p>
+        </div>
+        <Form name="login" onFinish={onFinish} size="large">
+          <Form.Item name="username" rules={[{ required: true, message: '请输入用户名' }]}>
+            <Input prefix={<UserOutlined />} placeholder="用户名" />
+          </Form.Item>
+          <Form.Item name="password" rules={[{ required: true, message: '请输入密码' }]}>
+            <Input.Password prefix={<LockOutlined />} placeholder="密码" />
+          </Form.Item>
+          <Form.Item>
+            <Button type="primary" htmlType="submit" loading={loading} block style={{ height: 44, borderRadius: 10, fontWeight: 500 }}>
+              登 录
+            </Button>
+          </Form.Item>
+        </Form>
+      </Card>
+    </div>
+  );
+};
+
+export default LoginPage;