feat(admin): Admin V2 — Ant Design Pro 纯 SPA 重写

Next.js SSR/hydration 与 SWR fetch-on-mount 存在根本冲突：
hydration 卸载组件时 abort 的请求仍占用后端 DB 连接，
retry 循环耗尽 PostgreSQL 连接池导致后端完全卡死。

admin-v2 使用 Vite + React + antd 纯 SPA 彻底消除此问题：
- 12 页面全部完成（Login, Dashboard, Accounts, Providers, Models,
  API Keys, Usage, Relay, Config, Prompts, Logs, Agent Templates）
- ProTable + ProForm + ProLayout 统一 UI 模式
- TanStack Query + Axios + Zustand 数据层
- JWT 自动刷新 + 401 重试机制
- 全部 18 网络请求 200 OK，零 ERR_ABORTED

同时更新 troubleshooting 第 13 节和 SaaS 平台文档。

admin-v2/src/pages/ApiKeys.tsx

@@ -0,0 +1,165 @@
+// ============================================================
+// API 密钥管理
+// ============================================================
+
+import { useState } from 'react'
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
+import { Button, message, Tag, Modal, Form, Input, InputNumber, Select, Popconfirm, Space, Typography } from 'antd'
+import { PlusOutlined, CopyOutlined } from '@ant-design/icons'
+import type { ProColumns } from '@ant-design/pro-components'
+import { ProTable } from '@ant-design/pro-components'
+import { apiKeyService } from '@/services/api-keys'
+import type { TokenInfo } from '@/types'
+
+const { Text } = Typography
+
+export default function ApiKeys() {
+  const queryClient = useQueryClient()
+  const [form] = Form.useForm()
+  const [modalOpen, setModalOpen] = useState(false)
+  const [newToken, setNewToken] = useState<string | null>(null)
+
+  const { data, isLoading } = useQuery({
+    queryKey: ['api-keys'],
+    queryFn: () => apiKeyService.list(),
+  })
+
+  const createMutation = useMutation({
+    mutationFn: (data: { name: string; expires_days?: number; permissions: string[] }) =>
+      apiKeyService.create(data),
+    onSuccess: (result: TokenInfo) => {
+      message.success('创建成功')
+      queryClient.invalidateQueries({ queryKey: ['api-keys'] })
+      if (result.token) {
+        setNewToken(result.token)
+      }
+      setModalOpen(false)
+      form.resetFields()
+    },
+    onError: (err: Error) => message.error(err.message || '创建失败'),
+  })
+
+  const revokeMutation = useMutation({
+    mutationFn: (id: string) => apiKeyService.revoke(id),
+    onSuccess: () => {
+      message.success('已撤销')
+      queryClient.invalidateQueries({ queryKey: ['api-keys'] })
+    },
+    onError: (err: Error) => message.error(err.message || '撤销失败'),
+  })
+
+  const columns: ProColumns<TokenInfo>[] = [
+    { title: '名称', dataIndex: 'name', width: 160 },
+    { title: '前缀', dataIndex: 'token_prefix', width: 120, render: (_, r) => <Text code>{r.token_prefix}...</Text> },
+    {
+      title: '权限',
+      dataIndex: 'permissions',
+      width: 200,
+      render: (_, r) => r.permissions?.map((p) => <Tag key={p}>{p}</Tag>),
+    },
+    {
+      title: '过期时间',
+      dataIndex: 'expires_at',
+      width: 180,
+      render: (_, r) => r.expires_at ? new Date(r.expires_at).toLocaleString('zh-CN') : '永不过期',
+    },
+    {
+      title: '最后使用',
+      dataIndex: 'last_used_at',
+      width: 180,
+      render: (_, r) => r.last_used_at ? new Date(r.last_used_at).toLocaleString('zh-CN') : '-',
+    },
+    {
+      title: '创建时间',
+      dataIndex: 'created_at',
+      width: 180,
+      render: (_, r) => new Date(r.created_at).toLocaleString('zh-CN'),
+    },
+    {
+      title: '操作',
+      width: 100,
+      render: (_, record) => (
+        <Popconfirm title="确定撤销此密钥？撤销后无法恢复。" onConfirm={() => revokeMutation.mutate(record.id)}>
+          <Button size="small" danger>撤销</Button>
+        </Popconfirm>
+      ),
+    },
+  ]
+
+  const handleCreate = async () => {
+    const values = await form.validateFields()
+    createMutation.mutate(values)
+  }
+
+  const copyToken = () => {
+    if (newToken) {
+      navigator.clipboard.writeText(newToken)
+      message.success('已复制到剪贴板')
+    }
+  }
+
+  return (
+    <div>
+      <ProTable<TokenInfo>
+        columns={columns}
+        dataSource={data?.items ?? []}
+        loading={isLoading}
+        rowKey="id"
+        search={false}
+        toolBarRender={() => [
+          <Button key="add" type="primary" icon={<PlusOutlined />} onClick={() => { form.resetFields(); setModalOpen(true) }}>
+            创建密钥
+          </Button>,
+        ]}
+        pagination={{
+          total: data?.total ?? 0,
+          pageSize: data?.page_size ?? 20,
+          current: data?.page ?? 1,
+          showSizeChanger: false,
+        }}
+      />
+
+      <Modal
+        title="创建 API 密钥"
+        open={modalOpen}
+        onOk={handleCreate}
+        onCancel={() => { setModalOpen(false); form.resetFields() }}
+        confirmLoading={createMutation.isPending}
+      >
+        <Form form={form} layout="vertical">
+          <Form.Item name="name" label="名称" rules={[{ required: true }]}>
+            <Input placeholder="给密钥起个名字" />
+          </Form.Item>
+          <Form.Item name="expires_days" label="有效期 (天)">
+            <InputNumber min={1} placeholder="留空则永不过期" style={{ width: '100%' }} />
+          </Form.Item>
+          <Form.Item name="permissions" label="权限" rules={[{ required: true }]}>
+            <Select mode="multiple" placeholder="选择权限" options={[
+              { value: 'relay:use', label: '中转使用' },
+              { value: 'model:read', label: '模型读取' },
+              { value: 'config:read', label: '配置读取' },
+            ]} />
+          </Form.Item>
+        </Form>
+      </Modal>
+
+      <Modal
+        title="密钥创建成功"
+        open={!!newToken}
+        onOk={() => setNewToken(null)}
+        onCancel={() => setNewToken(null)}
+      >
+        <p>请立即保存此密钥，关闭后将无法再次查看：</p>
+        <Input.TextArea
+          value={newToken || ''}
+          rows={3}
+          readOnly
+          addonAfter={<CopyOutlined onClick={copyToken} style={{ cursor: 'pointer' }} />}
+        />
+        <Button type="primary" icon={<CopyOutlined />} onClick={copyToken} style={{ marginTop: 8 }}>
+          复制密钥
+        </Button>
+      </Modal>
+    </div>
+  )
+}