Add Role based grain placement

src/Managing.Application/Grains/BundleBacktestGrain.cs

@@ -1,6 +1,7 @@
 using System.Text.Json;
 using Managing.Application.Abstractions.Grains;
 using Managing.Application.Abstractions.Services;
+using Managing.Application.Orleans;
 using Managing.Core;
 using Managing.Domain.Accounts;
 using Managing.Domain.Backtests;
@@ -18,8 +19,10 @@ namespace Managing.Application.Grains;
 /// Stateless worker grain for processing bundle backtest requests
 /// Uses the bundle request ID as the primary key (Guid)
 /// Implements IRemindable for automatic retry of failed bundles
+/// Uses custom compute placement with random fallback.
 /// </summary>
 [StatelessWorker]
+[TradingPlacement] // Use custom compute placement with random fallback
 public class BundleBacktestGrain : Grain, IBundleBacktestGrain, IRemindable
 {
     private readonly ILogger<BundleBacktestGrain> _logger;