fix(proxy-input): worker_id→user_id 수정 + 공통 입력 UI로 변경

백엔드:
- proxyInputModel 전체 worker_id→user_id 전환
  (작업보고서/휴가 매핑 실패 → 전부 미입력으로 표시되던 문제)

프론트:
- 개별 입력 → 공통 입력 1개로 전환
  프로젝트/공종/시간/부적합 한번 입력 → 선택된 전원에 적용
- 부서별 그룹핑 표시
- 적용 대상 칩 표시

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

system1-factory/web/css/proxy-input.css

@@ -60,6 +60,24 @@
 .pi-skeleton { height: 52px; border-radius: 10px; background: linear-gradient(90deg, #e5e7eb 25%, #f3f4f6 50%, #e5e7eb 75%); background-size: 200% 100%; animation: pi-shimmer 1.5s infinite; }
 @keyframes pi-shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
 
+/* Department Label */
+.pi-dept-label { font-size: 11px; font-weight: 700; color: #6b7280; text-transform: uppercase; letter-spacing: 0.5px; padding: 8px 2px 4px; }
+
+/* Bulk Form */
+.pi-bulk-form { background: white; border-radius: 12px; padding: 14px; margin-bottom: 12px; box-shadow: 0 1px 4px rgba(0,0,0,0.08); display: flex; flex-direction: column; gap: 8px; }
+.pi-edit-row { display: flex; gap: 8px; }
+.pi-select { flex: 1; padding: 8px 10px; border: 1px solid #d1d5db; border-radius: 8px; font-size: 14px; background: white; }
+.pi-field { display: flex; flex-direction: column; gap: 2px; flex: 1; }
+.pi-field span { font-size: 11px; color: #6b7280; font-weight: 600; }
+.pi-input { padding: 8px; border: 1px solid #d1d5db; border-radius: 8px; font-size: 15px; text-align: center; font-weight: 600; }
+.pi-note-input { width: 100%; padding: 8px 10px; border: 1px solid #d1d5db; border-radius: 8px; font-size: 13px; }
+
+/* Target Section */
+.pi-target-section { background: white; border-radius: 12px; padding: 12px; margin-bottom: 80px; box-shadow: 0 1px 4px rgba(0,0,0,0.08); }
+.pi-target-label { font-size: 12px; font-weight: 700; color: #6b7280; margin-bottom: 8px; }
+.pi-target-list { display: flex; flex-wrap: wrap; gap: 6px; }
+.pi-target-chip { font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 20px; background: #dbeafe; color: #1e40af; }
+
 /* Empty */
 .pi-empty { display: flex; flex-direction: column; align-items: center; gap: 8px; padding: 48px 16px; color: #9ca3af; font-size: 14px; }