fix: 优化服务号与支付逻辑，增加AccessToken为空校验及优惠描述完善

Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application/Services/PayService.cs

@@ -224,18 +224,25 @@ public class PayService : ApplicationService, IPayService
             // 如果是尊享包商品，计算折扣
             if (goodsType.IsPremiumPackage())
             {
-                 discountDescription = "累计充值每10元可减2.5元，最多减50元";
-                if ( CurrentUser.IsAuthenticated)
+
+                
+                if (CurrentUser.IsAuthenticated)
                 {
                     discountAmount = goodsType.CalculateDiscount(totalRechargeAmount);
                     actualPrice = goodsType.GetDiscountedPrice(totalRechargeAmount);
-
                     if (discountAmount > 0)
                     {
                         discountDescription = $"根据累积充值已优惠 ¥{discountAmount:F2}";
                     }
+                    else
+                    {
+                        discountDescription = $"累积充值过低，暂无优惠";
+                    }
+                }
+                else
+                {
+                    discountDescription = $"登录后查看优惠";
                 }
-              
             }
 
             var goodsItem = new GoodsListOutput
@@ -255,7 +262,7 @@ public class PayService : ApplicationService, IPayService
 
         return goodsList;
     }
-    
+
 
     /// <summary>
     /// 获取交易状态描述
@@ -280,6 +287,7 @@ public class PayService : ApplicationService, IPayService
         {
             return result;
         }
+
         return TradeStatusEnum.WAIT_TRADE;
     }
-}
+}