feat(orders): 号主可从自己的列表隐藏已结束订单

只写入隐藏时间，订单和款项仍保留给租客与后台。详情按钮固定对齐，删除跟在后面。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/internal/modules/order/dto.go

@@ -101,6 +101,7 @@ type UserOrderListItemDTO struct {
 	DepositWaivedAmountCent int64      `json:"deposit_waived_amount_cent"`
 	Status                  string     `json:"status"`
 	HandoffStatus           string     `json:"handoff_status"`
+	CanHide                 bool       `json:"can_hide,omitempty"`
 	PaymentDeadlineAt       *time.Time `json:"payment_deadline_at,omitempty"`
 	DistributionSiteID      *uint64    `json:"distribution_site_id,omitempty"`
 	CreatedAt               time.Time  `json:"created_at"`