feat: iot_card/device Store 新增 UpdateRealnamePolicy 方法

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

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

internal/store/postgres/device_store.go

@@ -250,3 +250,10 @@ func (s *DeviceStore) UpdatePollingStatus(ctx context.Context, deviceID uint, en
 		Where("id = ?", deviceID).
 		Update("enable_polling", enablePolling).Error
 }
+
+// UpdateRealnamePolicy 更新设备的实名认证策略
+func (s *DeviceStore) UpdateRealnamePolicy(ctx context.Context, deviceID uint, realnamePolicy string) error {
+	return s.db.WithContext(ctx).Model(&model.Device{}).
+		Where("id = ?", deviceID).
+		Update("realname_policy", realnamePolicy).Error
+}