Fix active strategy count on plateform surmmary

src/Managing.Application.Abstractions/Grains/PlatformSummaryGrainState.cs

@@ -45,29 +45,6 @@ public class PlatformSummaryGrainState
 
     // Flag to track if volume has been updated by events (not from bot strategies)
     [Id(15)] public bool VolumeUpdatedByEvents { get; set; }
-
-    // Historical strategy activation/deactivation events
-    [Id(16)] public List<StrategyEvent> StrategyEvents { get; set; } = new();
-}
-
-/// <summary>
-/// Strategy activation/deactivation event
-/// </summary>
-[GenerateSerializer]
-public class StrategyEvent
-{
-    [Id(0)] public DateTime Timestamp { get; set; }
-    [Id(1)] public StrategyEventType EventType { get; set; }
-    [Id(2)] public int NetChange { get; set; } // +1 for activation, -1 for deactivation
-}
-
-/// <summary>
-/// Type of strategy event
-/// </summary>
-public enum StrategyEventType
-{
-    Activation,
-    Deactivation
 }
 
 /// <summary>