feat: iot_card/device Service 新增 UpdateRealnamePolicy 方法（含幂等检查）

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

internal/service/device/service.go

@@ -1018,6 +1018,30 @@ func (s *Service) StartDevice(ctx context.Context, deviceID uint) error {
 	return nil
 }
 
+// UpdateRealnamePolicy 更新设备的实名认证策略
+func (s *Service) UpdateRealnamePolicy(ctx context.Context, deviceID uint, realnamePolicy string) error {
+	// 检查设备是否存在
+	device, err := s.deviceStore.GetByID(ctx, deviceID)
+	if err != nil {
+		if err == gorm.ErrRecordNotFound {
+			return errors.New(errors.CodeNotFound, "设备不存在")
+		}
+		return errors.Wrap(errors.CodeDatabaseError, err, "查询设备失败")
+	}
+
+	// 幂等检查
+	if device.RealnamePolicy == realnamePolicy {
+		return nil
+	}
+
+	// 更新数据库
+	if err := s.deviceStore.UpdateRealnamePolicy(ctx, deviceID, realnamePolicy); err != nil {
+		return errors.Wrap(errors.CodeDatabaseError, err, "更新实名认证策略失败")
+	}
+
+	return nil
+}
+
 func (s *Service) invalidatePollingCardCache(cardID uint) {
 	if s.redis == nil {
 		return

internal/service/iot_card/service.go

@@ -1124,3 +1124,32 @@ func (s *Service) BatchDeleteCards(ctx context.Context, cardIDs []uint) error {
 
 	return nil
 }
+
+// UpdateRealnamePolicy 更新卡的实名认证策略
+func (s *Service) UpdateRealnamePolicy(ctx context.Context, cardID uint, realnamePolicy string) error {
+	// 检查卡是否存在
+	card, err := s.iotCardStore.GetByID(ctx, cardID)
+	if err != nil {
+		if err == gorm.ErrRecordNotFound {
+			return errors.New(errors.CodeNotFound, "IoT卡不存在")
+		}
+		return errors.Wrap(errors.CodeDatabaseError, err, "查询IoT卡失败")
+	}
+
+	// 幂等检查
+	if card.RealnamePolicy == realnamePolicy {
+		return nil
+	}
+
+	// 更新数据库
+	if err := s.iotCardStore.UpdateRealnamePolicy(ctx, cardID, realnamePolicy); err != nil {
+		return errors.Wrap(errors.CodeDatabaseError, err, "更新实名认证策略失败")
+	}
+
+	s.logger.Info("更新卡实名认证策略",
+		zap.Uint("card_id", cardID),
+		zap.String("realname_policy", realnamePolicy),
+	)
+
+	return nil
+}