修复平台代管订单流程

backend/internal/modules/order/pricing.go

@@ -155,16 +155,16 @@ func buildCheckout(order model.RentalOrder, initiatedBy uint64, status string, c
 		return model.OrderCheckout{}, err
 	}
 	return model.OrderCheckout{
-		OrderID:                 order.ID,
-		InitiatedBy:             initiatedBy,
-		Status:                  status,
-		RentAmountCent:          settlement.ActualRentAmountCent,
-		OwnerRentAmountCent:     settlement.OwnerRentIncomeCent,
-		PlatformFeeCent:         settlement.PlatformFeeCent,
-		DepositAmountCent:       order.DepositAmountCent,
-		ConsumableAmountCent:    consumableAmountCent,
-		CoinConsumedM:           roundQuantity(coinConsumedM),
-		OtherAmountCent:         otherAmountCent,
+		OrderID:              order.ID,
+		InitiatedBy:          initiatedBy,
+		Status:               status,
+		RentAmountCent:       settlement.ActualRentAmountCent,
+		OwnerRentAmountCent:  settlement.OwnerRentIncomeCent,
+		PlatformFeeCent:      settlement.PlatformFeeCent,
+		DepositAmountCent:    order.DepositAmountCent,
+		ConsumableAmountCent: consumableAmountCent,
+		CoinConsumedM:        roundQuantity(coinConsumedM),
+		OtherAmountCent:      otherAmountCent,
 		// 存用户申报的押金赔付（损坏等），打超由结算自动计入 shortfall/overshoot
 		DepositDeductAmountCent: deductAmountCent,
 		RenterRefundAmountCent:  settlement.RenterRefundCent,
@@ -219,6 +219,17 @@ func calculateCheckoutSettlement(order model.RentalOrder, consumableAmountCent i
 	} else {
 		usedOwnerCoinPriceCent = int64(math.Round(float64(sellerCoinBasePriceCent) * coinUseRatio))
 	}
+	coinOvershoot := totalCoinM > 0 && consumedM > totalCoinM
+	if !coinOvershoot {
+		// 未打超时，比例反推只能用于折算未用完部分，不能因四舍五入超过订单快照。
+		if totalCoinM > 0 && consumedM >= totalCoinM {
+			usedBuyerCoinPriceCent = buyerCoinBasePriceCent
+			usedOwnerCoinPriceCent = sellerCoinBasePriceCent
+		} else {
+			usedBuyerCoinPriceCent = minCent(usedBuyerCoinPriceCent, buyerCoinBasePriceCent)
+			usedOwnerCoinPriceCent = minCent(usedOwnerCoinPriceCent, sellerCoinBasePriceCent)
+		}
+	}
 
 	// 消耗品按申报金额计价，允许超过预收；号主侧按预收消耗品占比线性外推
 	usedBuyerConsumablePriceCent := maxCent(consumableAmountCent, 0)
@@ -227,6 +238,10 @@ func calculateCheckoutSettlement(order model.RentalOrder, consumableAmountCent i
 		consumableUseRatio = maxRatio(float64(usedBuyerConsumablePriceCent)/float64(prepaidConsumablePriceCent), 0)
 	}
 	usedOwnerConsumablePriceCent := int64(math.Round(float64(prepaidOwnerConsumablePriceCent) * consumableUseRatio))
+	if usedBuyerConsumablePriceCent <= prepaidConsumablePriceCent {
+		usedBuyerConsumablePriceCent = minCent(usedBuyerConsumablePriceCent, prepaidConsumablePriceCent)
+		usedOwnerConsumablePriceCent = minCent(usedOwnerConsumablePriceCent, prepaidOwnerConsumablePriceCent)
+	}
 
 	actualBuyerRentCent := usedBuyerCoinPriceCent + usedBuyerConsumablePriceCent
 	actualOwnerRentCent := usedOwnerCoinPriceCent + usedOwnerConsumablePriceCent