修复驳回退款恢复订单时交接进度被重置的问题

- 取消订单时从待交接状态取消不再覆盖 handoff_status，保留原有交接进度
- 驳回恢复时仅在 cancelled 或 renter_confirm_timeout 时重置为 pending_owner

backend/internal/modules/order/admin_actions.go

@@ -410,7 +410,9 @@ func (r *Repository) AdminRejectRefund(ctx context.Context, orderID uint64, acti
 				return errors.New("仅已取消的订单可以恢复")
 			}
 			order.Status = orderStatusPendingHandoff
-			order.HandoffStatus = handoffStatusPendingOwner
+			if order.HandoffStatus == handoffStatusCancelled || order.HandoffStatus == handoffStatusRenterConfirmTimeout {
+				order.HandoffStatus = handoffStatusPendingOwner
+			}
 			order.SettlementStatus = settlementStatusUnsettled
 			order.SettledAt = nil
 			reserveListingForOrder(listing)

backend/internal/modules/order/lifecycle.go

@@ -245,7 +245,6 @@ func (r *Repository) Cancel(ctx context.Context, userID uint64, orderID uint64)
 		beforeStatus := order.Status
 		now := time.Now()
 		order.Status = orderStatusCancelled
-		order.HandoffStatus = handoffStatusCancelled
 		order.SettledAt = &now
 		orderID := order.ID
 		if beforeStatus == orderStatusPendingHandoff {
@@ -253,6 +252,8 @@ func (r *Repository) Cancel(ctx context.Context, userID uint64, orderID uint64)
 			order.RefundStatus = refundStatusPendingReview
 			order.RefundAmountCent = totalCent
 			order.RefundedAt = nil
+		} else {
+			order.HandoffStatus = handoffStatusCancelled
 		}
 		if err := notification.Append(tx,
 			notification.Entry{