fix: 实时持仓服务轮询循环增加等待间隔，修正新流水增量判断基准

- Worker: 风险/预付金计算由连续空转改为30秒一轮（可被取消令牌立即唤醒）
- ClientPosiTask: HasNewFlow 改为与上次计算时间比较（原误传当前时间致增量判断失效），轮询间隔2秒
- 30秒兜底全量重算语义保留不变

YLWinSer/RealTimeCalcPositionService/ClientPosiTask.cs

@@ -40,7 +40,10 @@ namespace RealTimeCalcPositionService
             {
                 string calctime = memoryCache.Get<string>("calctime");
                 var currentTime = DateTime.Now;
-                bool hasNew= RealtimePnlCalc.HasNewFlow(currentTime);
+                //以上次计算时间为基准判断是否有新流水，避免无变化时空转重算
+                var hasNew = DateTime.TryParseExact(calctime, "yyyy-MM-dd HH:mm:ss.fff",
+                    System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.None, out var lastCalcTime)
+                    && RealtimePnlCalc.HasNewFlow(lastCalcTime);
                 if (string.IsNullOrEmpty(calctime)|| hasNew)
                 {
                     memoryCache.Set("calctime", currentTime.ToString("yyyy-MM-dd HH:mm:ss.fff"), TimeSpan.FromSeconds(30));
@@ -53,6 +56,7 @@ namespace RealTimeCalcPositionService
                         _logger.Error(ex, "实时持仓服务异常:" + ex.Message);
                     }
                 }
+                stoppingToken.WaitHandle.WaitOne(TimeSpan.FromSeconds(2));
             }
         }
         public async Task StopAsync(CancellationToken cancellationToken)

YLWinSer/RealTimeCalcPositionService/Worker.cs

@@ -47,7 +47,9 @@ namespace RealTimeCalcPositionService
                 {
                     _logger.Error(ex, "实时预付金计算异常:" + ex.Message);
                 }
-                
+
+                //估值数据盘中不变、交易另有事件触发，无需连续轮询
+                stoppingToken.WaitHandle.WaitOne(TimeSpan.FromSeconds(30));
             }
         }
         public  async Task StopAsync(CancellationToken cancellationToken)