修复平台代管订单流程

backend/internal/modules/order/repository_test.go

@@ -233,6 +233,42 @@ func TestCalculateCheckoutSettlementUsesExplicitRatiosForActualConsume(t *testin
 	}
 }
 
+func TestCalculateCheckoutSettlementCapsFullUseRatioRounding(t *testing.T) {
+	// 发布量刚好用完时，比例换算的四舍五入不能把线下待打款抬高。
+	order := model.RentalOrder{
+		RentAmountCent:      37210,
+		OwnerRentAmountCent: 34000,
+		PlatformFeeCent:     3210,
+		DepositAmountCent:   50000,
+		AccountSnapshot: datatypes.JSON([]byte(`{
+			"haf_coin_amount": 160000000,
+			"asset_summary": {
+				"price_breakdown": {
+					"buyer_ratio": 43,
+					"seller_ratio": 47,
+					"buyer_coin_base_price": 372.1,
+					"seller_coin_base_price": 340,
+					"consumable_price": 0
+				}
+			}
+		}`)),
+	}
+
+	settlement := calculateCheckoutSettlement(order, 0, 160, 0)
+	if settlement.ActualRentAmountCent != order.RentAmountCent {
+		t.Fatalf("ActualRentAmountCent = %d, want %d", settlement.ActualRentAmountCent, order.RentAmountCent)
+	}
+	if settlement.OwnerRentIncomeCent != order.OwnerRentAmountCent {
+		t.Fatalf("OwnerRentIncomeCent = %d, want %d", settlement.OwnerRentIncomeCent, order.OwnerRentAmountCent)
+	}
+	if settlement.PlatformFeeCent != order.PlatformFeeCent {
+		t.Fatalf("PlatformFeeCent = %d, want %d", settlement.PlatformFeeCent, order.PlatformFeeCent)
+	}
+	if settlement.OvershootAmountCent != 0 {
+		t.Fatalf("OvershootAmountCent = %d, want 0", settlement.OvershootAmountCent)
+	}
+}
+
 func TestCalculateDepositWaiverUsesSharedRemainingQuota(t *testing.T) {
 	paid, waived := calculateDepositWaiver(500, 300, 0)
 	if paid != 200 || waived != 300 {