fix(monthly-comparison): 미검토→검토완료 뱃지 + 확인버튼 제거

- admin_checked=1: "미검토" → "검토완료" 뱃지(파란색)로 변경
- "✓검토" 별도 뱃지 제거
- "확인 완료/문제 있음" 하단 버튼 항상 숨김 (관리자 페이지에서 불필요)
- 새 상태 뱃지 CSS: admin_checked, review_sent, change_request

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

system1-factory/web/css/monthly-comparison.css

@@ -210,7 +210,10 @@
     padding: 2px 8px; border-radius: 10px;
 }
 .mc-worker-status-badge.confirmed { background: #dcfce7; color: #166534; }
+.mc-worker-status-badge.admin_checked { background: #dbeafe; color: #1e40af; }
 .mc-worker-status-badge.pending { background: #fef3c7; color: #92400e; }
+.mc-worker-status-badge.review_sent { background: #e0e7ff; color: #3730a3; }
+.mc-worker-status-badge.change_request { background: #fff7ed; color: #c2410c; }
 .mc-worker-status-badge.rejected { background: #fef2f2; color: #991b1b; }
 .mc-worker-reject-reason {
     font-size: 0.7rem; color: #991b1b;