feat(distribution): 新增分销看板

frontend/src/layouts/AdminLayout.tsx

@@ -98,6 +98,7 @@ const allNavGroups: NavGroup[] = [
     label: '分销',
     icon: <ShareAltOutlined />,
     children: [
+      { key: '/distribution/dashboard', label: '分销看板', permission: 'distribution:site_view' },
       { key: '/distribution/sites', label: '站点管理', permission: 'distribution:site_view' },
       { key: '/distribution/orders', label: '分销订单', permission: 'distribution:order_view' },
       {
@@ -153,6 +154,7 @@ const sectionMeta: Record<string, { title: string; description: string }> = {
   '/finance/operating-expenses': { title: '运营开支', description: '登记与核对日常运营支出。' },
   '/withdrawals': { title: '提现审核', description: '审核提现申请与打款确认。' },
   '/distribution/sites': { title: '分销站点', description: '管理分站、规则、结算与站点钱包。' },
+  '/distribution/dashboard': { title: '分销看板', description: '查看站点收号、订单、利润与近 7 天趋势。' },
   '/distribution/orders': { title: '分销订单', description: '核对分销订单快照与冷却期释放状态。' },
   '/distribution/settlements': { title: '结算批次', description: '生成人工批次并核对、释放站内份额。' },
   '/distribution/users': { title: '分销用户', description: '查看站点注册客户、下单客户与消费贡献。' },