R59 A1-A6：极简考勤打卡

- 新增 AttendanceRecord 与 AttendancePolicy 模型
- 上下班打卡、今日状态、月度统计端点
- 考勤管理页面（我的/团队/设置三 Tab）
- 移动端快速打卡入口
- 管理员补卡与审计日志
- 单测覆盖打卡幂等、迟到计算、工时计算、权限边界

client/src/components/navigation/NavLinks.tsx

@@ -21,6 +21,7 @@ export const NAV_ITEMS: NavItem[] = [
   { to: "/portal", label: "Portal", icon: "home_app_logo" },
   { to: "/team", label: "团队", icon: "groups" },
   { to: "/leave-requests", label: "请假", icon: "event_available", anyOf: ["leave.view_own", "leave.view_all", "leave.manage"] },
+  { to: "/attendance", label: "考勤", icon: "schedule" },
   { to: "/reimbursements", label: "报销", icon: "request_quote", anyOf: ["expense.view_own", "expense.view_all"] },
   { to: "/assets", label: "资产", icon: "inventory_2", anyOf: ["asset.view_own", "asset.view_all", "asset.manage", "asset.transfer", "asset.inventory"] },
   { to: "/weekly-reports", label: "周报", icon: "article" },