feat(category): 添加文章分类关联文章功能

- 在 ArticleCategory 模型中新增 article 关联方法
- 修改 ArticleCategoryService 中 getList 方法，增加预加载 article 关系
- 支持在获取分类列表时同时获取关联的文章数据

app/model/ArticleCategory.php

@@ -30,4 +30,8 @@ class ArticleCategory extends BaseModel
      */
     public $timestamps = true;
 
+    public function article()
+    {
+        return $this->hasMany(CreationArticle::class, 'article_category_id', 'id');
+    }
 }

app/service/ArticleCategoryService.php

@@ -76,7 +76,7 @@ class ArticleCategoryService extends BaseService
         if (isNotBlank($params['end_time'])) {
             $query[] = ['create_time', '<=', strtotime($params['end_time'] . ' 23:59:59')];
         }
-        $list = $this->dao->getList($query, '*', $page, $limit, "$sortField $sortRule");
+        $list = $this->dao->getList($query, '*', $page, $limit, "$sortField $sortRule", [], ['article']);
         $count = $this->dao->getCount($query);
         return compact('list', 'count');
     }