fix(monthly-comparison): 0일 0h 수정 + 관리자 검토 태깅

- getAllStatus: daily_attendance_records JOIN으로 실제 근무일/시간 집계
- vacation_days: vacation_types.deduct_days SUM (반차 0.5 정확 반영)
- admin_checked 컬럼 + POST /admin-check API (upsert 패턴)
- 상태 뱃지 라벨: 미검토/확인요청/수정요청/반려/확인완료

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

system1-factory/api/routes/monthlyComparisonRoutes.js

@@ -29,6 +29,9 @@ router.post('/review-send', requireSupportTeam, ctrl.reviewSend);
 // 관리자: 수정요청 응답 (change_request → review_sent 또는 rejected)
 router.post('/review-respond', requireSupportTeam, ctrl.reviewRespond);
 
+// 관리자: 개별 검토 태깅
+router.post('/admin-check', requireSupportTeam, ctrl.adminCheck);
+
 // 전체 현황 (support_team+)
 router.get('/all-status', requireSupportTeam, ctrl.getAllStatus);