feat(distribution): 完善分销站与主站业务数据及权益风控隔离，修复历史商品归属

backend/internal/modules/order/lifecycle.go

@@ -63,9 +63,20 @@ func (r *Repository) Create(ctx context.Context, renterID uint64, req CreateRequ
 			return err
 		}
 		rentOriginalAmountCent := pricing.RentAmountCent
-		growthSnapshot, err := rentergrowth.SnapshotForUser(tx, renterID)
-		if err != nil {
-			return err
+		var growthSnapshot rentergrowth.DiscountSnapshot
+		if distributionSite == nil {
+			snap, err := rentergrowth.SnapshotForUser(tx, renterID)
+			if err != nil {
+				return err
+			}
+			growthSnapshot = snap
+		} else {
+			// 分销站点订单隔离主站成长等级免押与折扣，防止主站免押坏账与折扣侵蚀分销收益
+			growthSnapshot = rentergrowth.DiscountSnapshot{
+				LevelCode:   rentergrowth.DefaultLevelCode,
+				LevelName:   rentergrowth.DefaultLevelName,
+				DiscountBps: rentergrowth.DefaultDiscountBps,
+			}
 		}
 		rentDiscountAmountCent := rentergrowth.CalculateDiscountCent(pricing.PureCoinAmountCent, pricing.PureCoinPlatformFeeCent, growthSnapshot.DiscountBps)
 		if rentDiscountAmountCent > 0 {