feat: Phase 2 BOM 마이그레이션 추가

- Phase 2.1: BDmodels.seconditem → PT items 6건 추가
  - 누락 부품: L-BAR, 보강평철, 케이스, 하단마감재 등
- Phase 2.2: items.bom JSON 연결 18건
  - FG items (models) ↔ PT items (seconditem) BOM 관계 설정
- 최종: items 634건, prices 634건, BOM 18건

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

database/seeders/Kyungdong/KyungdongItemSeeder.php

@@ -12,6 +12,8 @@
  * Phase 1.0: chandj.KDunitprice (601건) → items, prices
  * Phase 1.1: chandj.models (18건) → items (FG), prices
  * Phase 1.2: chandj.item_list (9건) → items (PT), prices
+ * Phase 2.1: chandj.BDmodels.seconditem → items (PT) 누락 부품 추가
+ * Phase 2.2: chandj.BDmodels → items.bom JSON (FG ↔ PT 연결)
  *
  * @see docs/plans/kd-items-migration-plan.md
  */
@@ -60,14 +62,21 @@ public function run(): void
         // Phase 1.2: item_list → items (PT)
         $itemListCount = $this->migrateItemList($tenantId, $userId);
 
+        // Phase 2.1: BDmodels.seconditem → items (PT) 누락 부품
+        $bdPartsCount = $this->migrateBDmodelsParts($tenantId, $userId);
+
         // prices 생성 (모든 items 기반)
         $priceCount = $this->migratePrices($tenantId, $userId);
 
-        $totalItems = $itemCount + $modelCount + $itemListCount;
+        // Phase 2.2: BDmodels → items.bom JSON
+        $bomCount = $this->migrateBom($tenantId);
+
+        $totalItems = $itemCount + $modelCount + $itemListCount + $bdPartsCount;
         $this->command->info('');
         $this->command->info('✅ 마이그레이션 완료:');
-        $this->command->info("   → items: {$totalItems}건 (KDunitprice {$itemCount} + models {$modelCount} + item_list {$itemListCount})");
+        $this->command->info("   → items: {$totalItems}건 (KDunitprice {$itemCount} + models {$modelCount} + item_list {$itemListCount} + BDmodels부품 {$bdPartsCount})");
         $this->command->info("   → prices: {$priceCount}건");
+        $this->command->info("   → BOM 연결: {$bomCount}건");
     }
 
     /**
@@ -382,4 +391,193 @@ private function mapItemType(?string $itemDiv): string
     {
         return self::ITEM_TYPE_MAP[$itemDiv] ?? 'SM';
     }
+
+    /**
+     * Phase 2.1: BDmodels.seconditem → items (PT) 누락 부품 추가
+     *
+     * item_list에 없는 BDmodels.seconditem을 PT items로 생성
+     */
+    private function migrateBDmodelsParts(int $tenantId, int $userId): int
+    {
+        $this->command->info('');
+        $this->command->info('📦 [Phase 2.1] BDmodels.seconditem → items (PT) 누락 부품...');
+
+        // BDmodels에서 고유한 seconditem 목록 조회
+        $bdSecondItems = DB::connection('chandj')
+            ->table('BDmodels')
+            ->where(function ($q) {
+                $q->where('is_deleted', 0)->orWhereNull('is_deleted');
+            })
+            ->whereNotNull('seconditem')
+            ->where('seconditem', '!=', '')
+            ->distinct()
+            ->pluck('seconditem');
+
+        // 이미 존재하는 PT items 코드 조회
+        $existingPtCodes = DB::table('items')
+            ->where('tenant_id', $tenantId)
+            ->where('item_type', 'PT')
+            ->pluck('code')
+            ->map(fn ($code) => str_starts_with($code, 'PT-') ? substr($code, 3) : $code)
+            ->toArray();
+
+        $items = [];
+        $now = now();
+
+        foreach ($bdSecondItems as $secondItem) {
+            // 이미 PT items에 있으면 스킵
+            if (in_array($secondItem, $existingPtCodes)) {
+                continue;
+            }
+
+            $code = "PT-{$secondItem}";
+
+            $items[] = [
+                'tenant_id' => $tenantId,
+                'item_type' => 'PT',
+                'code' => $code,
+                'name' => $secondItem,
+                'unit' => 'EA',
+                'category_id' => null,
+                'process_type' => null,
+                'item_category' => null,
+                'bom' => null,
+                'attributes' => json_encode([
+                    'legacy_source' => 'BDmodels_seconditem',
+                ]),
+                'attributes_archive' => null,
+                'options' => null,
+                'description' => null,
+                'is_active' => true,
+                'created_by' => $userId,
+                'updated_by' => $userId,
+                'created_at' => $now,
+                'updated_at' => $now,
+            ];
+        }
+
+        if (! empty($items)) {
+            DB::table('items')->insert($items);
+        }
+
+        $this->command->info("   → 소스 데이터: {$bdSecondItems->count()}건 (중복 제외 ".count($items).'건 신규)');
+        $this->command->info('   ✓ items (PT): '.count($items).'건 생성 완료');
+
+        return count($items);
+    }
+
+    /**
+     * Phase 2.2: BDmodels → items.bom JSON (FG ↔ PT 연결)
+     *
+     * models 기반 FG items에 BOM 연결
+     * bom: [{child_item_id: X, quantity: Y}, ...]
+     */
+    private function migrateBom(int $tenantId): int
+    {
+        $this->command->info('');
+        $this->command->info('🔗 [Phase 2.2] BDmodels → items.bom JSON 연결...');
+
+        // PT items 조회 (code → id 매핑)
+        $ptItems = DB::table('items')
+            ->where('tenant_id', $tenantId)
+            ->where('item_type', 'PT')
+            ->pluck('id', 'code')
+            ->toArray();
+
+        // PT- prefix 없는 버전도 매핑 추가
+        $ptItemsByName = [];
+        foreach ($ptItems as $code => $id) {
+            $name = str_starts_with($code, 'PT-') ? substr($code, 3) : $code;
+            $ptItemsByName[$name] = $id;
+        }
+
+        // FG items 조회 (models 기반)
+        $fgItems = DB::table('items')
+            ->where('tenant_id', $tenantId)
+            ->where('item_type', 'FG')
+            ->whereNotNull('attributes')
+            ->get(['id', 'code', 'attributes']);
+
+        // BDmodels 데이터 조회
+        $bdModels = DB::connection('chandj')
+            ->table('BDmodels')
+            ->where(function ($q) {
+                $q->where('is_deleted', 0)->orWhereNull('is_deleted');
+            })
+            ->whereNotNull('model_name')
+            ->where('model_name', '!=', '')
+            ->get(['model_name', 'seconditem', 'savejson']);
+
+        // model_name → seconditems 그룹핑
+        $modelBomMap = [];
+        foreach ($bdModels as $bd) {
+            if (empty($bd->seconditem)) {
+                continue;
+            }
+
+            $modelName = $bd->model_name;
+            if (! isset($modelBomMap[$modelName])) {
+                $modelBomMap[$modelName] = [];
+            }
+
+            // savejson에서 수량 파싱 (col8이 수량)
+            $quantity = 1;
+            if (! empty($bd->savejson)) {
+                $json = json_decode($bd->savejson, true);
+                if (is_array($json) && ! empty($json)) {
+                    // 첫 번째 항목의 col8(수량) 사용
+                    $quantity = (int) ($json[0]['col8'] ?? 1);
+                }
+            }
+
+            // 중복 체크 후 추가
+            $found = false;
+            foreach ($modelBomMap[$modelName] as &$existing) {
+                if ($existing['seconditem'] === $bd->seconditem) {
+                    $found = true;
+                    break;
+                }
+            }
+            if (! $found) {
+                $modelBomMap[$modelName][] = [
+                    'seconditem' => $bd->seconditem,
+                    'quantity' => $quantity,
+                ];
+            }
+        }
+
+        $updatedCount = 0;
+
+        foreach ($fgItems as $fgItem) {
+            $attributes = json_decode($fgItem->attributes, true) ?? [];
+            $modelName = $attributes['model_name'] ?? null;
+
+            if (empty($modelName) || ! isset($modelBomMap[$modelName])) {
+                continue;
+            }
+
+            $bomArray = [];
+            foreach ($modelBomMap[$modelName] as $bomItem) {
+                $childItemId = $ptItemsByName[$bomItem['seconditem']] ?? null;
+                if ($childItemId) {
+                    $bomArray[] = [
+                        'child_item_id' => $childItemId,
+                        'quantity' => $bomItem['quantity'],
+                    ];
+                }
+            }
+
+            if (! empty($bomArray)) {
+                DB::table('items')
+                    ->where('id', $fgItem->id)
+                    ->update(['bom' => json_encode($bomArray)]);
+                $updatedCount++;
+            }
+        }
+
+        $this->command->info('   → BDmodels 모델: '.count($modelBomMap).'개');
+        $this->command->info("   ✓ items.bom 연결: {$updatedCount}건 완료");
+
+        return $updatedCount;
+    }
 }