feat(flow): 添加流程实例撤销功能

- 在控制器中新增撤销申请接口 /revoke/{instId}
- 实现服务层撤销逻辑，检查实例和任务状态
- 验证只有运行中的实例且所有任务都为待办状态时才允许撤销
- 更新实例和相关任务的状态为已撤销
- 添加事务管理确保数据一致性
- 完善接口文档注释说明撤销条件和返回值

fad-hrm/src/main/java/com/ruoyi/hrm/controller/HrmFlowInstanceController.java

@@ -73,4 +73,10 @@ public class HrmFlowInstanceController extends BaseController {
     public R<List<HrmFlowInstanceVo>> all(HrmFlowInstanceBo bo) {
         return R.ok(service.queryList(bo));
     }
+
+    @Log(title = "撤销申请", businessType = BusinessType.UPDATE)
+    @PutMapping("/revoke/{instId}")
+    public R<Void> revoke(@PathVariable @NotNull Long instId) {
+        return toAjax(service.revokeInstance(instId));
+    }
 }

fad-hrm/src/main/java/com/ruoyi/hrm/service/IHrmFlowInstanceService.java

@@ -31,4 +31,11 @@ public interface IHrmFlowInstanceService {
     Boolean updateByBo(HrmFlowInstanceBo bo);
 
     Boolean deleteWithValidByIds(Collection<Long> ids, Boolean isValid);
+
+    /**
+     * 撤销申请：只有instance和所有相关task都是审批中状态时，才能撤销
+     * @param instId 实例ID
+     * @return 是否成功
+     */
+    Boolean revokeInstance(Long instId);
 }

fad-hrm/src/main/java/com/ruoyi/hrm/service/impl/HrmFlowInstanceServiceImpl.java

@@ -171,6 +171,42 @@ public class HrmFlowInstanceServiceImpl implements IHrmFlowInstanceService {
         return baseMapper.deleteBatchIds(ids) > 0;
     }
 
+    @Override
+    @Transactional(rollbackFor = Exception.class)
+    public Boolean revokeInstance(Long instId) {
+        // 查询实例
+        HrmFlowInstance instance = baseMapper.selectById(instId);
+        if (instance == null || !"running".equals(instance.getStatus())) {
+            throw new RuntimeException("实例不存在或状态不允许撤销");
+        }
+
+        // 检查所有相关任务状态
+        List<HrmFlowTask> tasks = taskMapper.selectList(Wrappers.<HrmFlowTask>lambdaQuery()
+            .eq(HrmFlowTask::getInstId, instId)
+            .eq(HrmFlowTask::getDelFlag, 0)); // 未删除的任务
+        for (HrmFlowTask task : tasks) {
+            if (!"pending".equals(task.getStatus())) {
+                throw new RuntimeException("存在非待办状态的任务，无法撤销");
+            }
+        }
+
+        // 更新实例状态
+        HrmFlowInstance updateInstance = new HrmFlowInstance();
+        updateInstance.setInstId(instId);
+        updateInstance.setStatus("revoked");
+        baseMapper.updateById(updateInstance);
+
+        // 更新所有任务状态
+        for (HrmFlowTask task : tasks) {
+            HrmFlowTask updateTask = new HrmFlowTask();
+            updateTask.setTaskId(task.getTaskId());
+            updateTask.setStatus("revoked");
+            taskMapper.updateById(updateTask);
+        }
+
+        return true;
+    }
+
     private LambdaQueryWrapper<HrmFlowInstance> buildQueryWrapper(HrmFlowInstanceBo bo) {
         LambdaQueryWrapper<HrmFlowInstance> lqw = Wrappers.lambdaQuery();
         lqw.eq(bo.getInstId() != null, HrmFlowInstance::getInstId, bo.getInstId());