feat: 修改实名认证策略默认值为先充值后实名（after_order）

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

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

internal/model/device_import_task.go

@@ -28,7 +28,7 @@ type DeviceImportTask struct {
 	ErrorMessage   string            `gorm:"column:error_message;type:text;comment:错误信息" json:"error_message"`
 	StartedAt      *time.Time        `gorm:"column:started_at;comment:开始处理时间" json:"started_at"`
 	CompletedAt    *time.Time        `gorm:"column:completed_at;comment:完成时间" json:"completed_at"`
-	RealnamePolicy string            `gorm:"column:realname_policy;type:varchar(20);default:'none';not null;comment:导入批次实名策略(none=无需实名,before_order=先实名后充值/购买,after_order=先充值/购买后实名)" json:"realname_policy"`
+	RealnamePolicy string            `gorm:"column:realname_policy;type:varchar(20);default:'after_order';not null;comment:导入批次实名策略(none=无需实名,before_order=先实名后充值/购买,after_order=先充值/购买后实名)" json:"realname_policy"`
 }
 
 // TableName 指定表名