feat: BP-MES Phase 1 - products/product_components 테이블 확장

- products 테이블에 33개 필드 추가
  - 공통: is_active, margin_rate, costs, safety_stock, lead_time, is_variable_size
  - FG 전용: product_category, lot_abbreviation, note
  - PT 전용: part_type, part_usage, installation_type, assembly_type,
    side_spec_width, side_spec_height, assembly_length,
    guide_rail_model_type, guide_rail_model
  - 절곡품: bending_diagram, bending_details, material, length, bending_length
  - 인증: certification_number, start/end_date, specification/certification files
  - 동적 확장: options (JSON)

- product_components 테이블에 5개 필드 추가
  - 수식 계산: quantity_formula
  - 조건부 BOM: condition
  - 절곡품: is_bending, bending_diagram, bending_details

- Product/ProductComponent 모델 fillable/casts 업데이트
- 인덱스 추가: is_active, product_category, part_type, part_usage, is_bending

app/Models/Products/ProductComponent.php

@@ -23,6 +23,13 @@ class ProductComponent extends Model
         'ref_id',
         'quantity',
         'sort_order',
+        // BP-MES: 수식 계산 및 조건부 BOM
+        'quantity_formula',
+        'condition',
+        // BP-MES: 절곡품
+        'is_bending',
+        'bending_diagram',
+        'bending_details',
         'created_by',
         'updated_by',
     ];
@@ -32,6 +39,9 @@ class ProductComponent extends Model
         'created_at' => 'datetime',
         'updated_at' => 'datetime',
         'deleted_at' => 'datetime',
+        // BP-MES: 추가 타입 캐스팅
+        'is_bending' => 'boolean',
+        'bending_details' => 'array',
     ];
 
     protected $hidden = [