refactor: 절곡 재고 마이그레이션 커맨드 리팩토링 및 검증/시더 추가

- Migrate5130BendingStock: BD-* 품목 초기 재고 셋팅으로 목적 변경, --min-stock 옵션 추가
- ValidateBendingItems: BD-* 품목 존재 여부 검증 커맨드 신규
- BendingItemSeeder: 경동 절곡 품목 시딩 신규

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

database/seeders/Kyungdong/BendingItemSeeder.php

@@ -0,0 +1,151 @@
+<?php
+
+namespace Database\Seeders\Kyungdong;
+
+use Illuminate\Database\Seeder;
+use Illuminate\Support\Facades\DB;
+
+/**
+ * BD-* 미등록 절곡 세부품목 일괄 등록
+ *
+ * Phase 0.1: BD-XX (7개), BD-YY (4개), BD-HH (2개)
+ * 추가 누락: BD-RM/RC/RD-42, BD-SM-24, BD-BS-35/43, BD-TS-43, BD-GI-54/84
+ *
+ * 실행: php artisan db:seed --class="Database\Seeders\Kyungdong\BendingItemSeeder"
+ */
+class BendingItemSeeder extends Seeder
+{
+    private int $tenantId = 287; // 경동기업
+
+    /**
+     * 길이코드 → mm 매핑
+     */
+    private const LENGTH_MAP = [
+        '12' => 1219,
+        '24' => 2438,
+        '30' => 3000,
+        '35' => 3500,
+        '40' => 4000,
+        '41' => 4150,
+        '42' => 4200,
+        '43' => 4300,
+        '53' => 3000, // 연기차단재50 전용
+        '54' => 4000, // 연기차단재50 전용
+        '83' => 3000, // 연기차단재80 전용
+        '84' => 4000, // 연기차단재80 전용
+    ];
+
+    /**
+     * 등록 대상 정의
+     */
+    private function getItemDefinitions(): array
+    {
+        return [
+            // Phase 0.1 대상
+            'XX' => [
+                'name' => '하부BASE/셔터 상부/마구리',
+                'lengthCodes' => ['12', '24', '30', '35', '40', '41', '43'],
+            ],
+            'YY' => [
+                'name' => '별도SUS마감',
+                'lengthCodes' => ['30', '35', '40', '43'],
+            ],
+            'HH' => [
+                'name' => '보강평철',
+                'lengthCodes' => ['30', '40'],
+            ],
+            // 추가 누락분
+            'RM' => [
+                'name' => '가이드레일(벽면) 본체',
+                'lengthCodes' => ['42'],
+            ],
+            'RC' => [
+                'name' => '가이드레일(벽면) C형',
+                'lengthCodes' => ['42'],
+            ],
+            'RD' => [
+                'name' => '가이드레일(벽면) D형',
+                'lengthCodes' => ['42'],
+            ],
+            'SM' => [
+                'name' => '가이드레일(측면) 본체',
+                'lengthCodes' => ['24'],
+            ],
+            'BS' => [
+                'name' => '하단마감재 SUS',
+                'lengthCodes' => ['35', '43'],
+            ],
+            'TS' => [
+                'name' => '하단마감재 철재SUS',
+                'lengthCodes' => ['43'],
+            ],
+            'GI' => [
+                'name' => '연기차단재',
+                'lengthCodes' => ['54', '84'],
+                'nameOverrides' => [
+                    '54' => '연기차단재 W50 4000mm',
+                    '84' => '연기차단재 W80 4000mm',
+                ],
+            ],
+        ];
+    }
+
+    public function run(): void
+    {
+        $definitions = $this->getItemDefinitions();
+        $created = 0;
+        $skipped = 0;
+
+        foreach ($definitions as $prefix => $def) {
+            foreach ($def['lengthCodes'] as $lengthCode) {
+                $code = "BD-{$prefix}-{$lengthCode}";
+                $lengthMm = self::LENGTH_MAP[$lengthCode];
+                $name = ($def['nameOverrides'][$lengthCode] ?? null)
+                    ?: "{$def['name']} {$lengthMm}mm";
+
+                $exists = DB::table('items')
+                    ->where('tenant_id', $this->tenantId)
+                    ->where('code', $code)
+                    ->whereNull('deleted_at')
+                    ->exists();
+
+                if ($exists) {
+                    $this->command?->line("  ⏭️ skip (exists): {$code}");
+                    $skipped++;
+
+                    continue;
+                }
+
+                DB::table('items')->insert([
+                    'tenant_id' => $this->tenantId,
+                    'code' => $code,
+                    'name' => $name,
+                    'item_type' => 'PT',
+                    'item_category' => 'BENDING',
+                    'unit' => 'EA',
+                    'bom' => null,
+                    'attributes' => json_encode([]),
+                    'attributes_archive' => json_encode([]),
+                    'options' => json_encode([
+                        'source' => 'bending_item_seeder',
+                        'lot_managed' => true,
+                        'consumption_method' => 'auto',
+                        'production_source' => 'self_produced',
+                        'input_tracking' => true,
+                        'prefix' => $prefix,
+                        'length_code' => $lengthCode,
+                        'length_mm' => $lengthMm,
+                    ]),
+                    'is_active' => true,
+                    'created_at' => now(),
+                    'updated_at' => now(),
+                ]);
+
+                $this->command?->line("  ✅ created: {$code} ({$name})");
+                $created++;
+            }
+        }
+
+        $this->command?->info("BD-* 누락 품목 등록 완료: 생성 {$created}건, 스킵 {$skipped}건");
+    }
+}