Refactor LiveBotRegistryGrain and PlatformSummaryGrain to improve active bot tracking

- Introduced CalculateActiveBotsCount method in LiveBotRegistryGrain to streamline active bot count calculations.
- Updated logging to reflect active bot counts accurately during registration and unregistration.
- Added historical tracking of strategy activation/deactivation events in PlatformSummaryGrain, including a new StrategyEvent class and related logic to manage event history.
- Enhanced CalculateActiveStrategiesForDate method to compute active strategies based on historical events.

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

@@ -45,6 +45,29 @@ 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>