refactor(hwmom-workflow): 优化 COUNT 查询的 SQL 生成

- 为 COUNT 查询创建专门的查询包装器，不包含 ORDER BY 条件
- 解决了在 SQL Server 中因 ORDER BY 导致的查询错误问题
- 避免了不必要的排序操作

ruoyi-modules/hwmom-workflow/src/main/java/org/dromara/workflow/service/impl/FlwTaskServiceImpl.java

@@ -822,7 +822,8 @@ public class FlwTaskServiceImpl implements IFlwTaskService {
     @Override
     public Long countTaskWaitByCurrentUser() {
         FlowTaskBo flowTaskBo = new FlowTaskBo();
-        QueryWrapper<FlowTaskBo> queryWrapper = buildQueryWrapper(flowTaskBo);
+        // 为COUNT查询创建不包含ORDER BY的查询包装器
+        QueryWrapper<FlowTaskBo> queryWrapper = buildQueryWrapperForCount(flowTaskBo);
         queryWrapper.eq("t.node_type", NodeType.BETWEEN.getKey());
         queryWrapper.in("t.processed_by", SpringUtils.getBean(WorkflowPermissionHandler.class).permissions());
         queryWrapper.in("t.flow_status", BusinessStatusEnum.WAITING.getStatus());
@@ -837,9 +838,30 @@ public class FlwTaskServiceImpl implements IFlwTaskService {
     @Override
     public Long countTaskCopyByCurrentUser() {
         FlowTaskBo flowTaskBo = new FlowTaskBo();
-        QueryWrapper<FlowTaskBo> queryWrapper = buildQueryWrapper(flowTaskBo);
+        // 为COUNT查询创建不包含ORDER BY的查询包装器
+        QueryWrapper<FlowTaskBo> queryWrapper = buildQueryWrapperForCount(flowTaskBo);
         queryWrapper.in("t.processed_by", LoginHelper.getUserIdStr());
         return flwTaskMapper.countTaskCopy(queryWrapper);
     }
 
+    /**
+     * 为COUNT查询构建查询包装器（不包含ORDER BY条件）
+     *
+     * @param flowTaskBo 查询条件
+     * @return 查询包装器
+     */
+    private QueryWrapper<FlowTaskBo> buildQueryWrapperForCount(FlowTaskBo flowTaskBo) {
+        QueryWrapper<FlowTaskBo> wrapper = Wrappers.query();
+        wrapper.like(StringUtils.isNotBlank(flowTaskBo.getNodeName()), "t.node_name", flowTaskBo.getNodeName());
+        wrapper.like(StringUtils.isNotBlank(flowTaskBo.getFlowName()), "t.flow_name", flowTaskBo.getFlowName());
+        wrapper.like(StringUtils.isNotBlank(flowTaskBo.getFlowCode()), "t.flow_code", flowTaskBo.getFlowCode());
+        wrapper.in(CollUtil.isNotEmpty(flowTaskBo.getCreateByIds()), "t.create_by", flowTaskBo.getCreateByIds());
+        if (StringUtils.isNotBlank(flowTaskBo.getCategory())) {
+            List<Long> categoryIds = flwCategoryMapper.selectCategoryIdsByParentId(Convert.toLong(flowTaskBo.getCategory()));
+            wrapper.in("t.category", StreamUtils.toList(categoryIds, Convert::toStr));
+        }
+        // 注意：COUNT查询不添加ORDER BY条件，因为在SQL Server中会导致错误
+        return wrapper;
+    }
+
 }