add api

@@ -178,6 +178,7 @@ Response:
 
     private Boolean flagNotes;
     private Boolean svHasConsume;
+    private String gradeDesc;                   // 课程年级 + 类型： "四年级下智能知识点课"
     private CourseQrCodeEntity.CourseType courseTypeV3;         // 智能培优课类型
     private List<String> nationalKnowledge = new ArrayList<>();