分销后台前端对接与结算明细接口

- 新增 GET /admin/distribution/settlement-batches/:id/items 明细查询
- distribution-admin 重构为 react-router 多页面：仪表盘/网站/规则(启停)/订单(筛选分页)/结算(创建/明细/结算)/支付通道(绑定解绑)/账号展示(上下架)
- axios 统一 401 提示，引导回主站后台登录；金额统一整数分格式化
- npm run build(tsc 严格模式) 通过

distribution-admin/src/pages/Sites.tsx

@@ -0,0 +1,39 @@
+import { useEffect, useState } from 'react'
+import { Card, Table, Typography, Space, Tag, message } from 'antd'
+import { listSites, type Site } from '../api'
+
+export default function Sites() {
+  const [items, setItems] = useState<Site[]>([])
+  useEffect(() => {
+    listSites()
+      .then(setItems)
+      .catch(() => message.error('站点加载失败'))
+  }, [])
+  return (
+    <Space direction="vertical" className="page">
+      <Typography.Title level={3}>分销网站</Typography.Title>
+      <Card>
+        <Table
+          rowKey="id"
+          dataSource={items}
+          pagination={false}
+          columns={[
+            { title: '名称', dataIndex: 'site_name' },
+            { title: '编码', dataIndex: 'site_code' },
+            { title: '域名', dataIndex: 'domain' },
+            { title: '状态', dataIndex: 'status', render: (v: string) => <Tag color={v === 'active' ? 'green' : 'default'}>{v}</Tag> },
+            {
+              title: '账号展示',
+              dataIndex: 'display_account_enabled',
+              render: (v: boolean) => (v ? <Tag color="green">开启</Tag> : <Tag>关闭</Tag>),
+            },
+            {
+              title: '税费',
+              render: (_: unknown, row: Site) => (row.tax_enabled ? `${row.tax_rate_bps / 100}%` : '关闭'),
+            },
+          ]}
+        />
+      </Card>
+    </Space>
+  )
+}