统一后台 Table 分页：常开 10/20/50/100 条数切换

- 新增 admin-pagination 工具，标准列表与云触手记录分别配置
- 用户/审计等页补齐 showSizeChanger，避免 total≤50 时无法切换
- ConfigProvider 默认开启条数切换

apps/frontend/src/pages/admin/AdminTasksPage.tsx

@@ -24,6 +24,11 @@ import {
 import type { AdminTaskActionResponse, AdminTaskListItem } from '@/types/admin'
 import { hasAdminRole } from '@/utils/admin-auth'
 import { adminTaskStatusOptions } from '@/utils/admin-options'
+import {
+  ADMIN_DEFAULT_PAGE_SIZE,
+  buildAdminTablePagination,
+  resolveAdminPageSize,
+} from '@/utils/admin-pagination'
 import { formatAdminDateTime } from '@/utils/admin-time'
 
 type TaskFilterForm = {
@@ -50,7 +55,7 @@ export default function AdminTasksPage() {
   const [actionLoadingId, setActionLoadingId] = useState<number | null>(null)
   const [lastClaimUrl, setLastClaimUrl] = useState('')
   const page = Number(searchParams.get('page') || 1) || 1
-  const pageSize = Number(searchParams.get('pageSize') || 20) || 20
+  const pageSize = resolveAdminPageSize(searchParams.get('pageSize'), ADMIN_DEFAULT_PAGE_SIZE)
   const canManageTaskLifecycle = hasAdminRole('operator')
   const canCloseTasks = hasAdminRole('support')
   const filters = {
@@ -397,16 +402,14 @@ export default function AdminTasksPage() {
           columns={columns}
           dataSource={data?.items || []}
           scroll={{ x: 1500 }}
-          pagination={{
+          pagination={buildAdminTablePagination({
             current: data?.pagination.page || page,
             pageSize: data?.pagination.pageSize || pageSize,
             total: data?.pagination.total || 0,
-            showSizeChanger: true,
-            showTotal: (total) => `共 ${total} 条`,
             onChange: (nextPage, nextPageSize) => {
               setSearchParams(cleanParams({ ...filters, page: nextPage, pageSize: nextPageSize }))
             },
-          }}
+          })}
         />
       </Card>
     </section>