fix: 恢复壹路运动站有效次数原始类型

将 YL_Train.StandardCounts 和 AiSportsStationDto.StandardCounts 从 double 恢复为 int，与原始实体定义及迁移快照保持一致。

列表查询保留显式数值转换，以适配测试库 float 和生产库 int 的列类型差异；不修改数据库表结构或数据。

验证：dotnet build VOL.WebApi/VOL.WebApi.csproj --no-restore -c Release 成功；git diff --cached --check 通过。

VOL.Ai/Services/AiSportsStationService.cs

@@ -102,8 +102,8 @@ namespace VOL.Ai.Services
                     train.StartTime,
                     train.EndTime,
                     train.Score,
-                    // QA stores this as float, while production still uses int.
+                    // Cast in SQL so int and float columns both materialize as the original int type.
-                    StandardCounts = Convert.ToDouble(train.StandardCounts),
+                    StandardCounts = Convert.ToInt32(Convert.ToDouble(train.StandardCounts)),
                     train.UnStandardCounts,
                     train.TimeKeeping,
                     train.Duration,

VOL.Entity/DomainModels/YiLu/YL_Train.cs

@@ -72,7 +72,7 @@ namespace VOL.Entity.DomainModels.YiLu
         /// <summary>
         /// 有效个数
         /// </summary>
-        public double StandardCounts { get; set; }
+        public int StandardCounts { get; set; }
 
         /// <summary>
         /// 不合格动作数

VOL.Model/Ai/Response/AiSportsStationDto.cs

@@ -42,7 +42,7 @@ namespace VOL.Model.Ai.Response
         /// </summary>
         public double? Score { get; set; }
 
-        public double StandardCounts { get; set; }
+        public int StandardCounts { get; set; }
 
         public int UnStandardCounts { get; set; }