fix(admin): 领券广告收益未填充时显示明确文案 (#52)

## 修改内容
- 广告收益字段支持 null
- null 显示未填充
- 真实零收益仍显示 ¥0.0000

## 验证
- TypeScript 类型检查通过
- Next.js 生产构建通过

---------

Co-authored-by: linkeyu <798648091@qq.com>
Reviewed-on: #52
Co-authored-by: linkeyu <linkeyu@wonderable.ai>
Co-committed-by: linkeyu <linkeyu@wonderable.ai>

src/app/(main)/huawei-review/page.tsx

@@ -0,0 +1,103 @@
+'use client';
+
+import { useCallback, useEffect, useState } from 'react';
+import { Alert, App, Button, Card, Descriptions, Radio, Skeleton, Tag } from 'antd';
+import { api, errMsg } from '@/lib/api';
+import { formatUtcTime } from '@/lib/format';
+
+// 华为审核开关:控制新手引导「快速设置」权限步能否被用户退出。
+// 华为应用市场审核要求该页必须可关闭(引导视频页不在要求内),平时保持「不能关闭」以保住权限开启率,
+// 送审期间切「可关闭」。落在 app_config 的 huawei_review 行,客户端经 /api/v1/platform/huawei-review 拉。
+type Mode = 'default' | 'review';
+
+interface HuaweiReview {
+  mode: Mode;
+  updated_at: string | null;
+}
+
+const MODE_LABEL: Record<Mode, string> = {
+  default: '不能关闭',
+  review: '可关闭',
+};
+
+export default function HuaweiReviewPage() {
+  const { message } = App.useApp();
+  const [loading, setLoading] = useState(true);
+  const [saving, setSaving] = useState(false);
+  // saved = 服务端当前值(用于「有没有改动」判断);mode = 编辑中的值
+  const [saved, setSaved] = useState<HuaweiReview | null>(null);
+  const [mode, setMode] = useState<Mode>('default');
+
+  const load = useCallback(async () => {
+    try {
+      const r = await api.get<HuaweiReview>('/admin/api/huawei-review');
+      setSaved(r.data);
+      setMode(r.data.mode);
+    } catch (e) {
+      message.error(errMsg(e, '华为审核开关加载失败'));
+    } finally {
+      setLoading(false);
+    }
+  }, [message]);
+
+  useEffect(() => {
+    load();
+  }, [load]);
+
+  const save = async () => {
+    setSaving(true);
+    try {
+      const r = await api.patch<HuaweiReview>('/admin/api/huawei-review', { mode });
+      setSaved(r.data);
+      setMode(r.data.mode);
+      message.success('已保存。客户端下次进新手引导时拉取生效');
+    } catch (e) {
+      message.error(errMsg(e, '保存失败'));
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  const dirty = saved !== null && saved.mode !== mode;
+
+  return (
+    <Card
+      title="华为审核开关"
+      extra={
+        <Button type="primary" loading={saving} disabled={loading || !dirty} onClick={save}>
+          保存
+        </Button>
+      }
+    >
+      <Alert
+        type="info"
+        style={{ marginBottom: 16 }}
+        message="华为应用市场审核要求「快速设置」页必须可以关闭。切到「可关闭」后,该页左上角出现退出按钮(返回键同样可退出),用户点了直接进 App 首页、本次引导视为已完成。"
+        description="① 只对华为机型(HarmonyOS / EMUI)生效,荣耀 MagicOS 及其它机型不受影响;② 只影响快速设置权限步,引导视频页照旧必须看完;③ 客户端在进引导前拉一次并缓存,已经停在引导页的用户要重进 App 才会变;④ 审核通过后记得切回「不能关闭」,不然会一直损失权限开启率。"
+      />
+      {loading ? (
+        <Skeleton active paragraph={{ rows: 3 }} />
+      ) : (
+        <>
+          <Descriptions column={1} style={{ marginBottom: 16 }}>
+            <Descriptions.Item label="当前生效">
+              {saved ? (
+                <Tag color={saved.mode === 'review' ? 'orange' : 'green'}>{MODE_LABEL[saved.mode]}</Tag>
+              ) : (
+                '-'
+              )}
+            </Descriptions.Item>
+            <Descriptions.Item label="最后修改">
+              {saved?.updated_at ? formatUtcTime(saved.updated_at) : '从未修改过(默认不能关闭)'}
+            </Descriptions.Item>
+          </Descriptions>
+          <div style={{ marginBottom: 8 }}>华为快速设置页是否可关闭</div>
+          <Radio.Group value={mode} onChange={(e) => setMode(e.target.value as Mode)}>
+            <Radio.Button value="default">不能关闭</Radio.Button>
+            <Radio.Button value="review">可关闭</Radio.Button>
+          </Radio.Group>
+        </>
+      )}
+    </Card>
+  );
+}

src/app/(main)/layout.tsx

@@ -16,6 +16,7 @@ import {
   MoneyCollectOutlined,
   NotificationOutlined,
   ProfileOutlined,
+  SafetyCertificateOutlined,
   SettingOutlined,
   ShareAltOutlined,
   TeamOutlined,
@@ -78,6 +79,7 @@ const NAV_GROUPS: NavGroup[] = [
     children: [
       { key: '/config', icon: <SettingOutlined />, label: '系统配置' },
       { key: '/ad-revenue', icon: <NotificationOutlined />, label: '广告配置' },
+      { key: '/huawei-review', icon: <SafetyCertificateOutlined />, label: '华为审核开关' },
       { key: '/users', icon: <UserOutlined />, label: '用户管理' },
     ],
   },