fix: [작업자화면] 재공품 BD코드 표시 fallback 추가

- item.code 없을 시 sourceOrderItem.item_code에서 BD코드 추출

src/components/production/WorkerScreen/actions.ts

@@ -157,7 +157,7 @@ function transformToWorkerScreenFormat(api: WorkOrderApiItem): WorkOrder {
     nodeName: g.nodeName,
     items: (g.items || []).map((it) => ({
       id: it.id,
-      itemCode: it.item?.code || null,
+      itemCode: it.item?.code || it.source_order_item?.item_code || null,
       itemName: it.item_name,
       quantity: Number(it.quantity),
       specification: it.specification,