Add Role based grain placement

src/Managing.Application/Grains/PlatformSummaryGrain.cs

@@ -2,6 +2,7 @@ using Managing.Application.Abstractions;
 using Managing.Application.Abstractions.Grains;
 using Managing.Application.Abstractions.Models;
 using Managing.Application.Abstractions.Services;
+using Managing.Application.Orleans;
 using Managing.Domain.Bots;
 using Microsoft.Extensions.Logging;
 using static Managing.Common.Enums;
@@ -10,7 +11,9 @@ namespace Managing.Application.Grains;
 
 /// <summary>
 /// Grain for managing platform-wide summary metrics with real-time updates and periodic snapshots
+/// Uses custom trading placement with load balancing and built-in fallback.
 /// </summary>
+[TradingPlacement] // Use custom trading placement with load balancing
 public class PlatformSummaryGrain : Grain, IPlatformSummaryGrain, IRemindable
 {
     private readonly IPersistentState<PlatformSummaryGrainState> _state;