优化线下提号利润修改

backend/internal/modules/pickup/repository.go

@@ -270,6 +270,51 @@ func (r *Repository) Complete(ctx context.Context, pickupID uint64, req Complete
 	return r.FindByID(ctx, pickupID)
 }
 
+// UpdateProfit 修改提号中的线下利润，已完成和已取消的提号不可修改。
+func (r *Repository) UpdateProfit(ctx context.Context, pickupID uint64, req UpdateProfitRequest, adminID uint64, meta auditlog.Meta) (*PickupDTO, error) {
+	if r == nil || r.db == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	err := r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		var pickup model.AdminPickup
+		if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).First(&pickup, pickupID).Error; err != nil {
+			if errors.Is(err, gorm.ErrRecordNotFound) {
+				return ErrPickupNotFound
+			}
+			return err
+		}
+		if pickup.Status != StatusPickingUp {
+			return ErrPickupNotPickingUp
+		}
+
+		oldProfitAmountCent := pickup.ProfitAmountCent
+		pickup.ProfitAmountCent = req.ProfitAmountCent
+		if err := tx.Model(&pickup).Update("profit_amount_cent", pickup.ProfitAmountCent).Error; err != nil {
+			return err
+		}
+
+		bid := pickup.ID
+		return auditlog.Append(tx, auditlog.Entry{
+			ActorType: "admin",
+			ActorID:   adminID,
+			Action:    "pickup_profit_update",
+			BizType:   "admin_pickup",
+			BizID:     &bid,
+			Meta:      meta,
+			Detail: map[string]any{
+				"pickup_no":              pickup.PickupNo,
+				"old_profit_amount_cent": oldProfitAmountCent,
+				"new_profit_amount_cent": pickup.ProfitAmountCent,
+				"reason":                 strings.TrimSpace(req.Reason),
+			},
+		})
+	})
+	if err != nil {
+		return nil, err
+	}
+	return r.FindByID(ctx, pickupID)
+}
+
 // Cancel 取消提号：恢复 listing 为 published + 解锁 in_transaction，账号恢复可租。
 func (r *Repository) Cancel(ctx context.Context, pickupID uint64, reason string, adminID uint64, meta auditlog.Meta) error {
 	if r == nil || r.db == nil {