实现租客成长等级并优化展示

backend/internal/modules/order/lifecycle.go

@@ -8,6 +8,7 @@ import (
 	"hfb_sys/backend/internal/model"
 	"hfb_sys/backend/internal/modules/chat"
 	"hfb_sys/backend/internal/modules/notification"
+	"hfb_sys/backend/internal/modules/rentergrowth"
 
 	"gorm.io/datatypes"
 	"gorm.io/gorm"
@@ -42,6 +43,16 @@ func (r *Repository) Create(ctx context.Context, renterID uint64, req CreateRequ
 		}
 		rentHours := estimateOrderDurationHours(snapshot)
 		pricing := buildOrderPricing(listing, account)
+		rentOriginalAmountCent := pricing.RentAmountCent
+		growthSnapshot, err := rentergrowth.SnapshotForUser(tx, renterID)
+		if err != nil {
+			return err
+		}
+		rentDiscountAmountCent := rentergrowth.CalculateDiscountCent(rentOriginalAmountCent, pricing.PlatformFeeCent, growthSnapshot.DiscountBps)
+		if rentDiscountAmountCent > 0 {
+			pricing.PlatformFeeCent -= rentDiscountAmountCent
+			pricing.RentAmountCent -= rentDiscountAmountCent
+		}
 		depositOriginalAmountCent := listing.DepositAmountCent
 		paidDepositAmountCent, waivedDepositAmountCent, err := r.depositAmountsForOrder(tx, renterID, depositOriginalAmountCent)
 		if err != nil {
@@ -60,6 +71,11 @@ func (r *Repository) Create(ctx context.Context, renterID uint64, req CreateRequ
 			DepositOriginalAmountCent: depositOriginalAmountCent,
 			DepositWaivedAmountCent:   waivedDepositAmountCent,
 			PlatformFeeCent:           pricing.PlatformFeeCent,
+			RentOriginalAmountCent:    rentOriginalAmountCent,
+			RentDiscountAmountCent:    rentDiscountAmountCent,
+			RenterGrowthLevel:         growthSnapshot.LevelCode,
+			RenterGrowthLevelName:     growthSnapshot.LevelName,
+			RenterDiscountBps:         growthSnapshot.DiscountBps,
 			AccountSnapshot:           snapshot,
 			Status:                    orderStatusPendingPayment,
 			HandoffStatus:             handoffStatusNone,