feat: 优化仪表板和模板的默认排序

backend/src/main/java/io/dataease/base/mapper/ext/ExtPanelGroupMapper.xml

@@ -64,6 +64,9 @@
         <if test="sort != null">
             order by ${sort}
         </if>
+        <if test="sort == null">
+            order by panel_group.create_time desc
+        </if>
     </select>
 
     <delete id="deleteCircle">

backend/src/main/java/io/dataease/base/mapper/ext/ExtPanelTemplateMapper.xml

@@ -83,6 +83,9 @@
         <if test="sort != null">
             order by ${sort}
         </if>
+        <if test="sort == null">
+            order by panel_template.create_time desc
+        </if>
     </select>
 
     <delete id="deleteCircle">