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

server/src/config.js

@@ -120,6 +120,7 @@ function getConfig() {
     workflowDefinitionAdminEnabled: process.env.WORKFLOW_DEFINITION_ADMIN_ENABLED === "true",
     cutoverConsoleEnabled: process.env.CUTOVER_CONSOLE_ENABLED === "true",
     presenceBoardEnabled: process.env.PRESENCE_BOARD_ENABLED === "true",
+    attendanceEnabled: process.env.ATTENDANCE_ENABLED === "true",
     weeklyReportEnabled: process.env.WEEKLY_REPORT_ENABLED === "true",
     employeeLifecycleEnabled: process.env.EMPLOYEE_LIFECYCLE_ENABLED === "true",
     todoBoardEnabled: process.env.TODO_BOARD_ENABLED === "true",