feat: M0-09 admin files page

src/App.tsx

@@ -81,7 +81,7 @@ function App() {
                   <Route path="knowledge/bases" element={<Suspense fallback={<PageLoading />}><KnowledgeBasesPage /></Suspense>} />
                   <Route path="knowledge/sources" element={<Placeholder title="知识源列表" />} />
                   <Route path="imports" element={<Placeholder title="文档导入" />} />
-                  <Route path="files" element={<Placeholder title="文件与 COS" />} />
+                  <Route path="files" element={<Suspense fallback={<PageLoading />}><FilesAdminPage /></Suspense>} />
                   <Route
                     path="settings"
                     element={

src/pages/FilesAdmin.tsx

@@ -0,0 +1,45 @@
+import { useState } from 'react'
+import { useQuery, useQueryClient } from '@tanstack/react-query'
+import { Table, Button, Typography, App, Tag } from 'antd'
+import { ReloadOutlined, DeleteOutlined, FileOutlined } from '@ant-design/icons'
+import { api } from '@/services/http-client'
+import dayjs from 'dayjs'
+
+const { Title, Text } = Typography
+
+export default function FilesAdminPage() {
+  const { modal, message } = App.useApp()
+  const qc = useQueryClient()
+  const [page, setPage] = useState(1)
+
+  const { data, isLoading } = useQuery({
+    queryKey: ['admin-files', page],
+    queryFn: (): Promise<any> => api.get(`/admin-api/files?page=${page}&limit=20`),
+  })
+
+  const handleDelete = (file: any) => modal.confirm({
+    title: '删除文件', content: `确定删除 ${file.filename}？`, okType: 'danger',
+    onOk: async () => { await api.delete(`/admin-api/files/${file.id}`); message.success('已删除'); qc.invalidateQueries({ queryKey: ['admin-files'] }) },
+  })
+
+  const cols = [
+    { title: '文件名', dataIndex: 'filename', width: 200, ellipsis: true },
+    { title: '用户', width: 120, render: (_:any, r:any) => r.user?.nickname || r.user?.email || '-' },
+    { title: '类型', dataIndex: 'mimeType', width: 100, ellipsis: true },
+    { title: '大小', dataIndex: 'sizeBytes', width: 80, render: (v: number) => v ? (v / 1024).toFixed(1) + 'KB' : '-' },
+    { title: '用途', dataIndex: 'purpose', width: 80, render: (v: string) => <Tag>{v || '-'}</Tag> },
+    { title: '上传时间', dataIndex: 'createdAt', width: 150, render: (d: string) => dayjs(d).format('MM-DD HH:mm') },
+    { title: '操作', width: 80, render: (_:any, r:any) => <Button type="link" size="small" danger icon={<DeleteOutlined />} onClick={() => handleDelete(r)} /> },
+  ]
+
+  return (
+    <div>
+      <div style={{ display: 'flex', justifyContent: 'space-between', marginBottom: 16 }}>
+        <Title level={5} style={{ margin: 0 }}><FileOutlined /> 文件管理</Title>
+        <Button icon={<ReloadOutlined />} onClick={() => qc.invalidateQueries({ queryKey: ['admin-files'] })}>刷新</Button>
+      </div>
+      <Table dataSource={data?.items || []} columns={cols} rowKey="id" loading={isLoading}
+        pagination={{ current: page, pageSize: 20, total: data?.total || 0, onChange: setPage, showTotal: (t: number) => `共 ${t} 个` }} />
+    </div>
+  )
+}