Update AgentSummaryRepository to clarify BacktestCount management

- Added comments to indicate that BacktestCount is not updated directly in the entity, as it is managed independently via IncrementBacktestCountAsync. This change prevents other update operations from overwriting the BacktestCount, ensuring data integrity.

src/Managing.Infrastructure.Database/PostgreSql/AgentSummaryRepository.cs

@@ -276,7 +276,8 @@ public class AgentSummaryRepository : IAgentSummaryRepository
         entity.TotalVolume = domain.TotalVolume;
         entity.TotalBalance = domain.TotalBalance;
         entity.TotalFees = domain.TotalFees;
-        entity.BacktestCount = domain.BacktestCount;
+        // BacktestCount is NOT updated here - it's managed independently via IncrementBacktestCountAsync
+        // This prevents other update operations from overwriting the BacktestCount
     }
 
     private static AgentSummary MapToDomain(AgentSummaryEntity entity)