fix: 调整Kafka检查跳过时段和告警触发阈值

将Kafka检查跳过时段结束时间从4点延长至5点，并将数据库连接失败告警触发阈值从8次提高到10次，以减少误告警

Models/TimerClass.cs

@@ -42,9 +42,9 @@ namespace AutoNotificatPhone.Models
         private const int KafkaStaleMinutes = 5;
         // 数据库备份窗口（北京时间 3:00-4:00），该时段跳过心跳检查
         private const int KafkaCheckSkipStartHour = 3;
-        private const int KafkaCheckSkipEndHour = 4;
+        private const int KafkaCheckSkipEndHour = 5;
         // 数据库连接失败累计到 N 次才触发一次告警，避免告警风暴
-        private const int KafkaDbAlertTriggerCount = 8;
+        private const int KafkaDbAlertTriggerCount = 10;
 
         // 接收包“低值”判定阈值
         private const int RecvPackageLowThreshold = 70000;