fix(task): 优化下载通知任务的执行频率和时间范围

- 移除未使用的ZtMessageProducerService和NotificationAuthUtils依赖注入
- 将定时任务执行时间从每天21点调整为每天9点和21点
- 将查询时间范围从24小时缩短为12小时，提高查询效率
- 保持用户去重逻辑以避免重复发送通知

src/main/java/com/ycwl/basic/task/DownloadNotificationTasker.java

@@ -46,18 +46,14 @@ public class DownloadNotificationTasker {
     @Autowired
     private WechatSubscribeNotifyTriggerService notifyTriggerService;
     @Autowired
-    private ZtMessageProducerService ztMessageProducerService;
-    @Autowired
-    private NotificationAuthUtils notificationAuthUtils;
-    @Autowired
     private VideoTaskRepository videoTaskRepository;
 
-    @Scheduled(cron = "0 0 21 * * *")
+    @Scheduled(cron = "0 0 9,21 * * *")
     public void sendDownloadNotification() {
         log.info("开始执行定时任务");
         // 用于记录已发送通知的用户ID，避免重复发送
         Set<Long> sentMemberIds = ConcurrentHashMap.newKeySet();
-        videoMapper.listRelationByCreateTime(new Date(System.currentTimeMillis() - 24 * 60 * 60 * 1000), new Date())
+        videoMapper.listRelationByCreateTime(new Date(System.currentTimeMillis() - 12 * 60 * 60 * 1000), new Date())
                 .forEach(item -> {
                     // 检查该用户是否已经发送过通知，避免重复发送
                     if (sentMemberIds.contains(item.getMemberId())) {