refactor: CategoryField API를 SAM API Rules에 맞게 리팩토링

- FormRequest 패턴 적용 (CategoryFieldStoreRequest, CategoryFieldUpdateRequest)
- Service에서 Validator::make() 제거
- Controller 메시지 i18n 키로 변경 (__('message.category_field.*'))
- is_required 타입을 'Y'/'N' → boolean으로 통일
- Swagger 스키마 is_required boolean 타입으로 업데이트
- Model scopeRequired() boolean 조건으로 변경

app/Http/Controllers/Api/V1/CategoryFieldController.php

@@ -4,6 +4,8 @@
 
 use App\Helpers\ApiResponse;
 use App\Http\Controllers\Controller;
+use App\Http\Requests\CategoryField\CategoryFieldStoreRequest;
+use App\Http\Requests\CategoryField\CategoryFieldUpdateRequest;
 use App\Services\CategoryFieldService;
 use Illuminate\Http\Request;
 
@@ -16,15 +18,15 @@ public function index(int $id, Request $request)
     {
         return ApiResponse::handle(function () use ($id, $request) {
             return $this->service->index($id, $request->all());
-        }, '카테고리 필드 목록');
+        }, __('message.category_field.fetched'));
     }
 
     // POST /categories/{id}/fields
-    public function store(int $id, Request $request)
+    public function store(int $id, CategoryFieldStoreRequest $request)
     {
         return ApiResponse::handle(function () use ($id, $request) {
-            return $this->service->store($id, $request->all());
-        }, '카테고리 필드 생성');
+            return $this->service->store($id, $request->validated());
+        }, __('message.category_field.created'));
     }
 
     // GET /categories/fields/{field}
@@ -32,15 +34,15 @@ public function show(int $field)
     {
         return ApiResponse::handle(function () use ($field) {
             return $this->service->show($field);
-        }, '카테고리 필드 조회');
+        }, __('message.category_field.fetched'));
     }
 
     // PATCH /categories/fields/{field}
-    public function update(int $field, Request $request)
+    public function update(int $field, CategoryFieldUpdateRequest $request)
     {
         return ApiResponse::handle(function () use ($field, $request) {
-            return $this->service->update($field, $request->all());
-        }, '카테고리 필드 수정');
+            return $this->service->update($field, $request->validated());
+        }, __('message.category_field.updated'));
     }
 
     // DELETE /categories/fields/{field}
@@ -50,7 +52,7 @@ public function destroy(int $field)
             $this->service->destroy($field);
 
             return 'success';
-        }, '카테고리 필드 삭제');
+        }, __('message.category_field.deleted'));
     }
 
     // POST /categories/{id}/fields/reorder
@@ -60,7 +62,7 @@ public function reorder(int $id, Request $request)
             $this->service->reorder($id, $request->input());
 
             return 'success';
-        }, '카테고리 필드 정렬 저장');
+        }, __('message.category_field.reordered'));
     }
 
     // PUT /categories/{id}/fields/bulk-upsert
@@ -68,6 +70,6 @@ public function bulkUpsert(int $id, Request $request)
     {
         return ApiResponse::handle(function () use ($id, $request) {
             return $this->service->bulkUpsert($id, $request->input('items', []));
-        }, '카테고리 필드 일괄 업서트');
+        }, __('message.category_field.bulk_upsert'));
     }
 }