Merge branch 'main' into feature/distribution-system

同步结账损耗全额归号主与后台时间线 AuthImage 修复。

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

backend/internal/modules/order/pricing.go

@@ -340,16 +340,22 @@ func calculateCheckoutSettlement(order model.RentalOrder, consumableAmountCent i
 		}
 	}
 
-	// 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
+	// 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外推，超额及无预收损耗全额归号主
 	usedBuyerConsumablePriceCent := maxCent(consumableAmountCent, 0)
-	consumableUseRatio := 0.0
+	var usedOwnerConsumablePriceCent int64
 	if prepaidConsumablePriceCent > 0 {
-		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)
+		if usedBuyerConsumablePriceCent <= prepaidConsumablePriceCent {
+			consumableUseRatio := maxRatio(float64(usedBuyerConsumablePriceCent)/float64(prepaidConsumablePriceCent), 0)
+			usedOwnerConsumablePriceCent = int64(math.Round(float64(prepaidOwnerConsumablePriceCent) * consumableUseRatio))
+			usedOwnerConsumablePriceCent = minCent(usedOwnerConsumablePriceCent, prepaidOwnerConsumablePriceCent)
+		} else {
+			// 预收范围内按号主预收基准，超出预收部分作为后置损耗全额划归号主（平台不抽成）
+			excessCent := usedBuyerConsumablePriceCent - prepaidConsumablePriceCent
+			usedOwnerConsumablePriceCent = prepaidOwnerConsumablePriceCent + excessCent
+		}
+	} else {
+		// 原订单无预收消耗品，后置申报的消耗/损耗金额 100% 归号主，平台不抽成
+		usedOwnerConsumablePriceCent = usedBuyerConsumablePriceCent
 	}
 
 	pureCoinPlatformFeeCent := maxCent(usedBuyerCoinPriceCent-usedOwnerCoinPriceCent, 0)