feat(ad-audit): 新增看广告金币审计页

- /ad-audit 复算对账页:公式快照 + reward_video/feed 发奖明细 + 实发与复算一致性校验
- 侧栏新增「金币审计」导航
- types 增加 AdCoinAuditRow / AdCoinFormula / AdCoinAudit

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/(main)/layout.tsx

@@ -5,6 +5,7 @@ import { usePathname, useRouter } from 'next/navigation';
 import {
   DashboardOutlined,
   FileSearchOutlined,
+  FundProjectionScreenOutlined,
   LogoutOutlined,
   MessageOutlined,
   MoneyCollectOutlined,
@@ -23,6 +24,7 @@ const MENU = [
   { key: '/users', icon: <UserOutlined />, label: '用户管理' },
   { key: '/withdraws', icon: <MoneyCollectOutlined />, label: '提现管理' },
   { key: '/feedbacks', icon: <MessageOutlined />, label: '反馈工单' },
+  { key: '/ad-audit', icon: <FundProjectionScreenOutlined />, label: '金币审计' },
   { key: '/config', icon: <SettingOutlined />, label: '系统配置' },
   { key: '/admins', icon: <TeamOutlined />, label: '管理员', superOnly: true },
   { key: '/audit-logs', icon: <FileSearchOutlined />, label: '审计日志' },