feat: [재공품] STOCK 작업지시 dynamic_bom 생성 + 자재 매칭 구현

- BendingCodeService: lengthCodeToMm() public static 메서드 추가
- BendingInfoBuilder: buildDynamicBomForStockItem() 신규 메서드
  - bending_lot(prodCode/specCode/lengthCode) + partKey → BD 품목 코드 → dynamic_bom 엔트리 생성
  - PrefixResolver 활용하여 정확한 prefix 매핑
- OrderService: STOCK 확정 시 bending_lot 기반 dynamic_bom 자동 생성
- WorkOrderService: 기존 STOCK 호환 fallback (getMaterials + getMaterialsForItem)
  - dynamic_bom 없는 기존 재공품도 bending_lot.material로 원자재 검색

app/Services/OrderService.php

@@ -1735,6 +1735,24 @@ public function createProductionOrder(int $orderId, array $data)
                         }
                     }
 
+                    // STOCK(재고생산): bending_lot 기반 dynamic_bom 생성
+                    if ($isStock && empty($woItemOptions['dynamic_bom'])) {
+                        $orderOptions = $order->options ?? [];
+                        $bendingLot = $orderOptions['bending_lot'] ?? null;
+                        if ($bendingLot) {
+                            $partKey = \App\Services\WorkOrderService::parseStockPartKeyStatic($orderItem->item_name);
+                            $stockDynamicBom = app(BendingInfoBuilder::class)->buildDynamicBomForStockItem(
+                                $bendingLot,
+                                $partKey,
+                                (int) ($orderItem->quantity ?? 1),
+                                $tenantId,
+                            );
+                            if (! empty($stockDynamicBom)) {
+                                $woItemOptions['dynamic_bom'] = $stockDynamicBom;
+                            }
+                        }
+                    }
+
                     DB::table('work_order_items')->insert([
                         'tenant_id' => $tenantId,
                         'work_order_id' => $workOrder->id,
@@ -2239,7 +2257,7 @@ private static function buildStockBendingInfoFromLot(array $bendingLot, int $qua
         }
 
         // length_code → mm 변환
-        $lengthMm = self::stockLengthCodeToMmStatic($prodCode, $lengthCode);
+        $lengthMm = \App\Services\BendingCodeService::lengthCodeToMm($prodCode, $lengthCode);
         if ($lengthMm <= 0) {
             return null;
         }