fix: correct BackupTimeRangeStrategy mapping

Author: kCn3333

src/main/java/com/kcn/hikvisionmanager/mapper/BackupConfigMapper.java

@@ -35,6 +35,7 @@ public BackupConfigurationEntity toEntity(BackupConfigDTO dto) {
                 .cameraId(dto.getCameraId())
                 .enabled(dto.isEnabled())
                 .backupPath(backupConfig.getBaseDir().toString())
+                .timeRangeStrategy(dto.getTimeRangeStrategy())
                 .cronExpression(generateCron(dto))
                 .retentionDays(dto.getRetentionDays())
                 .notifyOnComplete(dto.isNotifyOnComplete())