refactor: 회사 폼 UI 개선 및 코드 정리

- 담당자 연락처 필드를 드롭다운 + 입력 방식으로 분리
- 사용자 폼과 동일한 전화번호 UI 패턴 적용
- 미사용 위젯 파일 4개 정리 (branch_card, contact_info_* 등)
- 파일명 통일성 확보 (branch_edit_screen → branch_form, company_form_simplified → company_form)
- 네이밍 일관성 개선으로 유지보수성 향상

lib/data/models/warehouse/warehouse_dto.g.dart

@@ -11,13 +11,9 @@ _$CreateWarehouseLocationRequestImpl
         _$CreateWarehouseLocationRequestImpl(
           name: json['name'] as String,
           address: json['address'] as String?,
-          city: json['city'] as String?,
-          state: json['state'] as String?,
-          postalCode: json['postal_code'] as String?,
-          country: json['country'] as String?,
+          managerName: json['manager_name'] as String?,
+          managerPhone: json['manager_phone'] as String?,
           capacity: (json['capacity'] as num?)?.toInt(),
-          managerId: (json['manager_id'] as num?)?.toInt(),
-          companyId: (json['company_id'] as num?)?.toInt(),
           remark: json['remark'] as String?,
         );
 
@@ -26,13 +22,9 @@ Map<String, dynamic> _$$CreateWarehouseLocationRequestImplToJson(
     <String, dynamic>{
       'name': instance.name,
       'address': instance.address,
-      'city': instance.city,
-      'state': instance.state,
-      'postal_code': instance.postalCode,
-      'country': instance.country,
+      'manager_name': instance.managerName,
+      'manager_phone': instance.managerPhone,
       'capacity': instance.capacity,
-      'manager_id': instance.managerId,
-      'company_id': instance.companyId,
       'remark': instance.remark,
     };
 
@@ -41,13 +33,9 @@ _$UpdateWarehouseLocationRequestImpl
         _$UpdateWarehouseLocationRequestImpl(
           name: json['name'] as String?,
           address: json['address'] as String?,
-          city: json['city'] as String?,
-          state: json['state'] as String?,
-          postalCode: json['postal_code'] as String?,
-          country: json['country'] as String?,
+          managerName: json['manager_name'] as String?,
+          managerPhone: json['manager_phone'] as String?,
           capacity: (json['capacity'] as num?)?.toInt(),
-          managerId: (json['manager_id'] as num?)?.toInt(),
-          isActive: json['is_active'] as bool?,
           remark: json['remark'] as String?,
         );
 
@@ -56,13 +44,9 @@ Map<String, dynamic> _$$UpdateWarehouseLocationRequestImplToJson(
     <String, dynamic>{
       'name': instance.name,
       'address': instance.address,
-      'city': instance.city,
-      'state': instance.state,
-      'postal_code': instance.postalCode,
-      'country': instance.country,
+      'manager_name': instance.managerName,
+      'manager_phone': instance.managerPhone,
       'capacity': instance.capacity,
-      'manager_id': instance.managerId,
-      'is_active': instance.isActive,
       'remark': instance.remark,
     };
 
@@ -71,23 +55,13 @@ _$WarehouseLocationDtoImpl _$$WarehouseLocationDtoImplFromJson(
     _$WarehouseLocationDtoImpl(
       id: (json['id'] as num).toInt(),
       name: json['name'] as String,
-      code: json['code'] as String?,
+      address: json['address'] as String?,
       managerName: json['manager_name'] as String?,
       managerPhone: json['manager_phone'] as String?,
       capacity: (json['capacity'] as num?)?.toInt(),
+      remark: json['remark'] as String?,
       isActive: json['is_active'] as bool,
       createdAt: DateTime.parse(json['created_at'] as String),
-      address: json['address'] as String?,
-      city: json['city'] as String?,
-      state: json['state'] as String?,
-      postalCode: json['postal_code'] as String?,
-      country: json['country'] as String?,
-      managerId: (json['manager_id'] as num?)?.toInt(),
-      updatedAt: json['updated_at'] == null
-          ? null
-          : DateTime.parse(json['updated_at'] as String),
-      currentStock: (json['current_stock'] as num?)?.toInt(),
-      availableCapacity: (json['available_capacity'] as num?)?.toInt(),
     );
 
 Map<String, dynamic> _$$WarehouseLocationDtoImplToJson(
@@ -95,21 +69,13 @@ Map<String, dynamic> _$$WarehouseLocationDtoImplToJson(
     <String, dynamic>{
       'id': instance.id,
       'name': instance.name,
-      'code': instance.code,
+      'address': instance.address,
       'manager_name': instance.managerName,
       'manager_phone': instance.managerPhone,
       'capacity': instance.capacity,
+      'remark': instance.remark,
       'is_active': instance.isActive,
       'created_at': instance.createdAt.toIso8601String(),
-      'address': instance.address,
-      'city': instance.city,
-      'state': instance.state,
-      'postal_code': instance.postalCode,
-      'country': instance.country,
-      'manager_id': instance.managerId,
-      'updated_at': instance.updatedAt?.toIso8601String(),
-      'current_stock': instance.currentStock,
-      'available_capacity': instance.availableCapacity,
     };
 
 _$WarehouseLocationListDtoImpl _$$WarehouseLocationListDtoImplFromJson(