feat: work_orders 테이블에 options JSON 컬럼 추가

- 마이그레이션: work_orders.options JSON nullable 컬럼 추가
- WorkOrder 모델: $fillable, $casts에 options 추가
- bending_info 등 작업지시 레벨 추가 옵션 저장용

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

app/Models/Production/WorkOrder.php

@@ -44,6 +44,7 @@ class WorkOrder extends Model
         'completed_at',
         'shipped_at',
         'memo',
+        'options',
         'is_active',
         'created_by',
         'updated_by',
@@ -55,6 +56,7 @@ class WorkOrder extends Model
         'completed_at' => 'datetime',
         'shipped_at' => 'datetime',
         'is_active' => 'boolean',
+        'options' => 'json',
     ];
 
     protected $hidden = [