fix(board): 修复看板数据排序和数量显示问题

- 添加按创建时间降序排列确保最新数据优先显示
- 将看板数量从18调整为12以符合业务需求
- 保持24小时时间范围过滤逻辑不变

src/main/java/com/gaotao/modules/base/service/Impl/BoardServiceImpl.java

@@ -18,7 +18,7 @@ public class BoardServiceImpl implements BoardService {
     private BoardMapper boardMapper;
     @Override
     public Map<String, Object> ifsCallErrorLogBoard(int pageIndex){
-        int kanbannum=18;
+        int kanbannum=12;
         Calendar calendar = Calendar.getInstance();
         calendar.add(Calendar.HOUR_OF_DAY, -24); // 减去24小时
         Date date24HoursAgo = calendar.getTime();

src/main/resources/mapper/base/BoardMapper.xml

@@ -14,5 +14,6 @@
             and a.created_at >= #{startDate}
         </if>
     </where>
+    order by a.created_at desc
 </select>
 </mapper>