feat: support article demo videos and category counts

ruoyi-system/src/main/java/com/ruoyi/app/mapper/AppBlogArticleMapper.java

@@ -3,6 +3,8 @@ package com.ruoyi.app.mapper;
 import java.util.List;
 
 import com.ruoyi.app.domain.AppBlogArticle;
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.Select;
 import org.apache.ibatis.annotations.Update;
 
 /**
@@ -37,6 +39,10 @@ public interface AppBlogArticleMapper
      */
     public List<AppBlogArticle> selectAppBlogArticleList(AppBlogArticle appBlogArticle);
 
+    /** 查询指定类型的可见文章数量 */
+    @Select("select count(*) from app_blog_article where article_type = #{articleType} and is_show = #{isShow}")
+    public Long countByArticleType(@Param("articleType") Long articleType, @Param("isShow") Long isShow);
+
     /**
      * 新增文章
      *