refactor(distribution): 重写分销迁移并落地利润百分比分成与货架比例

将 000064-000078 合并为 064/065/066，默认规则改为收号 35%、卖出 40%、服务费 25%。
货架调价改为增加分站 1 元兑换哈夫币比例。sql-guard 仅保护 main 已发布迁移。

backend/internal/modules/order/pricing.go

@@ -291,14 +291,7 @@ func effectiveCheckoutDepositDeductCent(checkout model.OrderCheckout) int64 {
 }
 
 func orderConsumptionPrepaidCent(order model.RentalOrder) int64 {
-	prepaid := order.RentAmountCent
-	if order.ShelfMarkupCent > 0 {
-		prepaid -= order.ShelfMarkupCent
-		if prepaid < 0 {
-			prepaid = 0
-		}
-	}
-	return prepaid
+	return order.RentAmountCent
 }
 
 func calculateCheckoutSettlement(order model.RentalOrder, consumableAmountCent int64, coinConsumedM float64, depositDeductAmountCent int64) checkoutSettlement {