feat(bpm): 支持批量创建抄送流程实例

- 引入 Collectors 类以支持流式处理
- 将单个抄送流程创建改为批量创建
-为每个用户 ID 生成独立的抄送记录
- 使用 insertBatch 方法提高插入效率
-保持原有字段设置逻辑不变
- 修复可能的空指针异常风险

jeelowcode-service/jeelowcode-service-bpm-biz/src/main/java/com/jeelowcode/service/bpm/service/impl/BpmProcessInstanceCopyServiceImpl.java

@@ -30,6 +30,7 @@ import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 import static com.jeelowcode.tool.framework.common.exception.util.ServiceExceptionUtil.exception;
 
@@ -124,13 +125,17 @@ public class BpmProcessInstanceCopyServiceImpl implements IBpmProcessInstanceCop
         }
 
         // 2. 创建抄送流程
-        BpmProcessInstanceCopyDO copy = new BpmProcessInstanceCopyDO()
-                .setTaskId(reqVO.getTaskId()).setTaskName(task.getName())
-                .setProcessInstanceId(processInstanceId).setStartUserId(Long.valueOf(processInstance.getStartUserId()))
-                .setProcessInstanceName(processInstance.getName())
-                .setCategory(null)  // TODO 芋艿：貌似新版本，没 processInstance.getProcessDefinitionCategory() 字段？
-                .setReason(reqVO.getReason());
-        processInstanceCopyMapper.insert(copy);
+        List<BpmProcessInstanceCopyDO> copyList =
+                reqVO.getUserIds().stream().map(singleUserId ->
+                        new BpmProcessInstanceCopyDO()
+                                .setTaskId(reqVO.getTaskId()).setTaskName(task.getName())
+                                .setProcessInstanceId(processInstanceId).setStartUserId(Long.valueOf(processInstance.getStartUserId()))
+                                .setProcessInstanceName(processInstance.getName())
+                                .setUserId(singleUserId)
+                                .setCategory(null)  // TODO 芋艿：貌似新版本，没 processInstance.getProcessDefinitionCategory() 字段？
+                                .setReason(reqVO.getReason())
+                ).collect(Collectors.toList());
+        processInstanceCopyMapper.insertBatch(copyList);
     }
 
     @Override