前端项目初始化，登录页支持暗色主题与禁止滑动

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/pages/DashboardPage.tsx

@@ -0,0 +1,35 @@
+import { Card, Statistic, Row, Col } from 'antd'
+import { UserOutlined, AppstoreOutlined } from '@ant-design/icons'
+
+export default function DashboardPage() {
+  return (
+    <div>
+      <h2 style={{ marginBottom: 24 }}>仪表盘</h2>
+      <Row gutter={16}>
+        <Col span={8}>
+          <Card>
+            <Statistic
+              title="用户总数"
+              value={0}
+              prefix={<UserOutlined />}
+            />
+          </Card>
+        </Col>
+        <Col span={8}>
+          <Card>
+            <Statistic
+              title="资产总数"
+              value={0}
+              prefix={<AppstoreOutlined />}
+            />
+          </Card>
+        </Col>
+        <Col span={8}>
+          <Card>
+            <Statistic title="今日新增" value={0} />
+          </Card>
+        </Col>
+      </Row>
+    </div>
+  )
+}