feat(work-orders): 다중 담당자 UI 구현

- actions.ts: createWorkOrder에 assigneeIds 배열 파라미터 추가
- actions.ts: assignWorkOrder가 단일/배열 모두 지원하도록 변경
- WorkOrderCreate.tsx: assigneeIds 배열로 API 전송
- WorkOrderDetail.tsx: 다중 담당자 표시 (쉼표 구분)

src/components/production/WorkOrders/WorkOrderCreate.tsx

@@ -151,7 +151,7 @@ export function WorkOrderCreate() {
         projectName: formData.projectName,
         processType: formData.processType,
         scheduledDate: formData.shipmentDate,
-        assigneeId: formData.assignees.length > 0 ? parseInt(formData.assignees[0]) : undefined,
+        assigneeIds: formData.assignees.map(id => parseInt(id)),
         memo: formData.note || undefined,
       });
 

src/components/production/WorkOrders/WorkOrderDetail.tsx

@@ -275,7 +275,9 @@ export function WorkOrderDetail({ orderId }: WorkOrderDetailProps) {
     quantity: order.items.reduce((sum, item) => sum + item.quantity, 0),
     progress: order.currentStep * 20, // 대략적인 진행률
     process: order.processType as 'screen' | 'slat' | 'bending',
-    assignees: [order.assignee],
+    assignees: order.assignees && order.assignees.length > 0
+      ? order.assignees.map(a => a.name)
+      : [order.assignee],
     instruction: order.note || '',
     status: 'in_progress' as const,
     priority: order.priority <= 3 ? 'high' : order.priority <= 6 ? 'medium' : 'low',
@@ -364,7 +366,11 @@ export function WorkOrderDetail({ orderId }: WorkOrderDetailProps) {
             </div>
             <div>
               <p className="text-sm text-muted-foreground mb-1">작업자</p>
-              <p className="font-medium">{order.assignee}</p>
+              <p className="font-medium">
+                {order.assignees && order.assignees.length > 0
+                  ? order.assignees.map(a => a.name).join(', ')
+                  : order.assignee}
+              </p>
             </div>
           </div>
         </div>

src/components/production/WorkOrders/actions.ts

@@ -220,15 +220,23 @@ export async function getWorkOrderById(id: string): Promise<{
 export async function createWorkOrder(
   data: Partial<WorkOrder> & {
     salesOrderId?: number;
-    assigneeId?: number;
+    assigneeId?: number;      // 단일 담당자 (하위 호환)
+    assigneeIds?: number[];   // 다중 담당자
     teamId?: number;
   }
 ): Promise<{ success: boolean; data?: WorkOrder; error?: string }> {
   try {
+    // 다중 담당자 우선, 없으면 단일 담당자 배열로 변환
+    const assigneeIds = data.assigneeIds && data.assigneeIds.length > 0
+      ? data.assigneeIds
+      : data.assigneeId
+        ? [data.assigneeId]
+        : undefined;
+
     const apiData = {
       ...transformFrontendToApi(data),
       sales_order_id: data.salesOrderId,
-      assignee_id: data.assigneeId,
+      assignee_ids: assigneeIds,  // 배열로 전송
       team_id: data.teamId,
     };
 
@@ -384,11 +392,13 @@ export async function updateWorkOrderStatus(
 // ===== 담당자 배정 =====
 export async function assignWorkOrder(
   id: string,
-  assigneeId: number,
+  assigneeIds: number | number[],  // 단일 또는 다중 담당자
   teamId?: number
 ): Promise<{ success: boolean; data?: WorkOrder; error?: string }> {
   try {
-    const body: { assignee_id: number; team_id?: number } = { assignee_id: assigneeId };
+    // 배열로 통일
+    const ids = Array.isArray(assigneeIds) ? assigneeIds : [assigneeIds];
+    const body: { assignee_ids: number[]; team_id?: number } = { assignee_ids: ids };
     if (teamId) body.team_id = teamId;
 
     console.log('[WorkOrderActions] PATCH assign request:', body);