Add MasterBotUserId and MasterAgentName for copy trading support

- Introduced MasterBotUserId and MasterAgentName properties to facilitate copy trading functionality.
- Updated relevant models, controllers, and database entities to accommodate these new properties.
- Enhanced validation logic in StartCopyTradingCommandHandler to ensure proper ownership checks for master strategies.

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

@@ -548,6 +548,12 @@ public class ManagingDbContext : DbContext
                 .WithMany()
                 .HasForeignKey(e => e.UserId)
                 .OnDelete(DeleteBehavior.SetNull);
+
+            // Configure relationship with MasterBotUser
+            entity.HasOne(e => e.MasterBotUser)
+                .WithMany()
+                .HasForeignKey(e => e.MasterBotUserId)
+                .OnDelete(DeleteBehavior.SetNull);
         });
 
         // Configure MoneyManagement entity