fix: 작업지시 단건조회(show)에 materialInputs eager loading 추가

- show() 메서드에 items.materialInputs, items.materialInputs.stockLot 누락
- 목록조회에만 있고 단건조회에 빠져서 프론트 입고 LOT NO 표시 안됨

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Services/WorkOrderService.php

@@ -217,6 +217,8 @@ public function show(int $id)
                 'process.steps' => fn ($q) => $q->where('is_active', true)->orderBy('sort_order'),
                 'items.sourceOrderItem:id,order_node_id,floor_code,symbol_code',
                 'items.sourceOrderItem.node:id,name,code',
+                'items.materialInputs:id,work_order_id,work_order_item_id,stock_lot_id,item_id,qty,input_by,input_at',
+                'items.materialInputs.stockLot:id,lot_no',
                 'bendingDetail',
                 'issues' => fn ($q) => $q->orderByDesc('created_at'),
                 'stepProgress.processStep:id,process_id,step_code,step_name,sort_order,needs_inspection,connection_type,completion_type',