feat: 完成TikTok短剧管理后台基础功能开发

本次提交搭建了完整的后台管理系统，包含：
1.  登录认证与权限校验体系
2.  工作台、短剧、用户、角色、人员、日志等全业务模块
3.  响应式布局与通用样式组件
4.  菜单动态过滤与路由权限控制
5.  移除了README中冗余的权限管理菜单项

src/Dashboard/index.css

@@ -0,0 +1,28 @@
+.page-grid {
+  display: grid;
+  grid-template-columns: repeat(4, minmax(0, 1fr));
+  gap: 16px;
+  margin-bottom: 16px;
+}
+
+.metric-card .label {
+  color: #86909c;
+  margin-bottom: 8px;
+}
+
+.metric-card .value {
+  font-size: 28px;
+  font-weight: 700;
+}
+
+@media (max-width: 900px) {
+  .page-grid {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+}
+
+@media (max-width: 640px) {
+  .page-grid {
+    grid-template-columns: 1fr;
+  }
+}

src/Dashboard/index.tsx

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+import { Card } from '@arco-design/web-react';
+import type { AdminProfile, AppUser, Drama, RequestLog } from '../api/types';
+import { usePageData } from '../hooks/usePageData';
+import { hasPermissions } from '../utils/permission';
+import { NoAccessPage } from '../components/NoAccessPage';
+import { RequestLogTable } from '../components/RequestLogTable';
+import './index.css';
+
+function MetricCard({ label, value }: { label: string; value: number | string }) {
+  return <Card className="metric-card"><div className="label">{label}</div><div className="value">{value}</div></Card>;
+}
+
+function DashboardPage({ profile }: { profile: AdminProfile | null }) {
+  const canReadDramas = hasPermissions(profile, ['drama:read']);
+  const canReadUsers = hasPermissions(profile, ['user:read']);
+  const canReadLogs = hasPermissions(profile, ['log:read']);
+  const dramas = usePageData<Drama>('/api/admin/v1/dramas', canReadDramas);
+  const users = usePageData<AppUser>('/api/admin/v1/users', canReadUsers);
+  const logs = usePageData<RequestLog>('/api/admin/v1/logs/requests', canReadLogs);
+  const hasAnyDataModule = canReadDramas || canReadUsers || canReadLogs;
+
+  return (
+    <>
+      <div className="page-grid">
+        {canReadDramas && <MetricCard label="短剧管理" value={dramas.data.pagination.total} />}
+        {canReadUsers && <MetricCard label="用户管理" value={users.data.pagination.total} />}
+        {canReadLogs && <MetricCard label="请求日志" value={logs.data.pagination.total} />}
+        <MetricCard label="接口状态" value="运行中" />
+      </div>
+      {canReadLogs ? (
+        <Card className="section-card" title="最近请求">
+          <RequestLogTable data={logs.data.list.slice(0, 8)} loading={logs.loading} />
+        </Card>
+      ) : null}
+      {!hasAnyDataModule ? <NoAccessPage /> : null}
+    </>
+  );
+}
+
+export default DashboardPage;