优化仲裁

backend/internal/modules/order/checkout_finalize.go

@@ -43,6 +43,7 @@ func (r *Repository) finalizeCheckout(tx *gorm.DB, order *model.RentalOrder, che
 	order.ActualCoinConsumedM = settlement.CoinConsumedM
 	order.ActualPureCoinAmountCent = settlement.PureCoinAmountCent
 	order.ActualPureCoinDiscountCent = settlement.PureCoinDiscountCent
+	order.ActualExtraItemAmountCent = settlement.ExtraItemAmountCent
 	if err := appendCheckoutCompletedNotifications(tx, order, renterContent); err != nil {
 		return nil, err
 	}

backend/internal/modules/order/dto.go

@@ -42,6 +42,7 @@ type OrderDTO struct {
 	ActualCoinConsumedM         float64           `json:"actual_coin_consumed_m,omitempty"`
 	ActualPureCoinAmountCent    int64             `json:"actual_pure_coin_amount_cent,omitempty"`
 	ActualPureCoinDiscountCent  int64             `json:"actual_pure_coin_discount_cent,omitempty"`
+	ActualExtraItemAmountCent   int64             `json:"actual_extra_item_amount_cent,omitempty"`
 	RenterGrowthLevel           string            `json:"renter_growth_level,omitempty"`
 	RenterGrowthLevelName       string            `json:"renter_growth_level_name,omitempty"`
 	RenterDiscountBps           int               `json:"renter_discount_bps,omitempty"`

backend/internal/modules/order/presenter.go

@@ -92,6 +92,7 @@ func (row orderRow) toAdminDTO() OrderDTO {
 		ActualCoinConsumedM:         row.ActualCoinConsumedM,
 		ActualPureCoinAmountCent:    row.ActualPureCoinAmountCent,
 		ActualPureCoinDiscountCent:  row.ActualPureCoinDiscountCent,
+		ActualExtraItemAmountCent:   row.ActualExtraItemAmountCent,
 		RenterGrowthLevel:           effectiveRenterGrowthLevel(row.RentalOrder),
 		RenterGrowthLevelName:       effectiveRenterGrowthLevelName(row.RentalOrder),
 		RenterDiscountBps:           effectiveRenterDiscountBps(row.RentalOrder),
@@ -330,6 +331,7 @@ func applyOrderPriceView(dto *OrderDTO, order model.RentalOrder, userID uint64)
 		dto.ActualCoinConsumedM = 0
 		dto.ActualPureCoinAmountCent = 0
 		dto.ActualPureCoinDiscountCent = 0
+		dto.ActualExtraItemAmountCent = 0
 		dto.RenterGrowthLevel = ""
 		dto.RenterGrowthLevelName = ""
 		dto.RenterDiscountBps = 0
@@ -362,6 +364,7 @@ func applyOrderPriceView(dto *OrderDTO, order model.RentalOrder, userID uint64)
 		dto.ActualCoinConsumedM = 0
 		dto.ActualPureCoinAmountCent = 0
 		dto.ActualPureCoinDiscountCent = 0
+		dto.ActualExtraItemAmountCent = 0
 		dto.RenterGrowthLevel = ""
 		dto.RenterGrowthLevelName = ""
 		dto.RenterDiscountBps = 0

backend/internal/modules/order/pricing.go

@@ -50,9 +50,28 @@ type ActualPureCoinAmounts struct {
 	ConsumedM    float64
 }
 
+// ActualCheckoutSettlement 是正常结账与仲裁共用的实际消耗结算结果。
+type ActualCheckoutSettlement struct {
+	OwnerRentIncomeCent     int64
+	DepositCompensationCent int64
+	OwnerIncomeCent         int64
+	RentRefundCent          int64
+	DepositRefundCent       int64
+	RenterRefundCent        int64
+	PlatformFeeCent         int64
+	ActualRentAmountCent    int64
+	PureCoinAmountCent      int64
+	PureCoinDiscountCent    int64
+	PureCoinPayableCent     int64
+	ExtraItemAmountCent     int64
+	CoinConsumedM           float64
+	OvershootAmountCent     int64
+	ShortfallCent           int64
+}
+
 // CalculateActualPureCoinAmounts 按订单价格快照和实际消耗 M 计算纯币原价及等级优惠。
 func CalculateActualPureCoinAmounts(order model.RentalOrder, coinConsumedM float64) ActualPureCoinAmounts {
-	settlement := calculateCheckoutSettlement(order, 0, coinConsumedM, 0)
+	settlement := CalculateActualCheckoutSettlement(order, 0, coinConsumedM, 0)
 	return ActualPureCoinAmounts{
 		AmountCent:   settlement.PureCoinAmountCent,
 		DiscountCent: settlement.PureCoinDiscountCent,
@@ -61,6 +80,31 @@ func CalculateActualPureCoinAmounts(order model.RentalOrder, coinConsumedM float
 	}
 }
 
+// CalculateActualCheckoutSettlement 按实际纯币和额外物品消耗计算完整结算。
+func CalculateActualCheckoutSettlement(order model.RentalOrder, consumableAmountCent int64, coinConsumedM float64, depositDeductAmountCent int64) ActualCheckoutSettlement {
+	return toActualCheckoutSettlement(calculateCheckoutSettlement(order, consumableAmountCent, coinConsumedM, depositDeductAmountCent))
+}
+
+func toActualCheckoutSettlement(settlement checkoutSettlement) ActualCheckoutSettlement {
+	return ActualCheckoutSettlement{
+		OwnerRentIncomeCent:     settlement.OwnerRentIncomeCent,
+		DepositCompensationCent: settlement.DepositCompensationCent,
+		OwnerIncomeCent:         settlement.OwnerIncomeCent,
+		RentRefundCent:          settlement.RentRefundCent,
+		DepositRefundCent:       settlement.DepositRefundCent,
+		RenterRefundCent:        settlement.RenterRefundCent,
+		PlatformFeeCent:         settlement.PlatformFeeCent,
+		ActualRentAmountCent:    settlement.ActualRentAmountCent,
+		PureCoinAmountCent:      settlement.PureCoinAmountCent,
+		PureCoinDiscountCent:    settlement.PureCoinDiscountCent,
+		PureCoinPayableCent:     settlement.PureCoinPayableCent,
+		ExtraItemAmountCent:     settlement.ExtraItemAmountCent,
+		CoinConsumedM:           settlement.CoinConsumedM,
+		OvershootAmountCent:     settlement.OvershootAmountCent,
+		ShortfallCent:           settlement.ShortfallCent,
+	}
+}
+
 func orderDurationHours(order model.RentalOrder) int {
 	if order.EstimatedDurationHours > 0 {
 		return order.EstimatedDurationHours