fix(task): 修复任务重复创建和空指针问题

- 在原位替换模式下设置taskParams为null，避免按参数匹配
- 添加isReuseOldTask标识判断是否复用旧任务
- 复用旧任务时执行更新操作而非新增操作
- 添加member和item空值检查，防止空指针异常
- 优化日志记录，提供更准确的操作信息

src/main/java/com/ycwl/basic/service/task/impl/TaskTaskServiceImpl.java

@@ -402,12 +402,15 @@ public class TaskTaskServiceImpl implements TaskService {
                 log.info("创建任务! faceId:{},templateId:{},taskParams:{}", faceId, templateId, sourcesMap);
                 ScenicConfigManager scenicConfig = scenicRepository.getScenicConfigManager(face.getScenicId());
                 TaskEntity taskEntity = null;
+                boolean isReuseOldTask = false;
                 if (Integer.valueOf(0).equals(scenicConfig.getInteger("template_new_video_type"))) {
                     log.info("景区{}启用：templateNewVideoType：全新视频原位替换", face.getScenicId());
                     taskReqQuery.setTemplateId(templateId);
+                    taskReqQuery.setTaskParams(null);  // 原位替换模式下，不按taskParams匹配
                     List<TaskEntity> templateTaskList = taskMapper.listEntity(taskReqQuery);
                     if (!templateTaskList.isEmpty()) {
                         taskEntity = templateTaskList.getFirst();
+                        isReuseOldTask = true;
                         log.info("已有旧生成的视频：{}", taskEntity);
                         MemberVideoEntity taskVideoRelation = videoMapper.queryRelationByMemberTask(face.getMemberId(), taskEntity.getId());
                         if (taskVideoRelation != null) {
@@ -428,7 +431,12 @@ public class TaskTaskServiceImpl implements TaskService {
                 taskEntity.setWorkerId(null);
                 taskEntity.setStatus(0);
                 taskEntity.setTaskParams(JacksonUtil.toJSONString(sourcesMap));
-                taskMapper.add(taskEntity);
+                if (isReuseOldTask) {
+                    taskMapper.update(taskEntity);
+                    log.info("更新旧任务! taskId:{}", taskEntity.getId());
+                } else {
+                    taskMapper.add(taskEntity);
+                }
                 memberVideoEntity.setTaskId(taskEntity.getId());
             } else {
                 log.info("重复task! faceId:{},templateId:{},taskParams:{}", faceId, templateId, sourcesMap);
@@ -590,6 +598,10 @@ public class TaskTaskServiceImpl implements TaskService {
     public void sendVideoGeneratedServiceNotification(Long taskId, Long memberId) {
         MemberVideoEntity item = videoMapper.queryRelationByMemberTask(memberId, taskId);
         MemberRespVO member = memberMapper.getById(memberId);
+        if (member == null || item == null) {
+            log.warn("sendVideoGeneratedServiceNotification member or item is null, memberId:{}, taskId:{}", memberId, taskId);
+            return;
+        }
         String openId = member.getOpenId();
         MpConfigEntity scenicMp = scenicRepository.getScenicMpConfig(member.getScenicId());
         if (StringUtils.isNotBlank(openId) && scenicMp != null) {