feat(data): add nullable max_turns override to list_config and tasks

src/ClaudeDo.Data/Configuration/ListConfigEntityConfiguration.cs

@@ -15,5 +15,6 @@ public class ListConfigEntityConfiguration : IEntityTypeConfiguration<ListConfig
         builder.Property(c => c.Model).HasColumnName("model");
         builder.Property(c => c.SystemPrompt).HasColumnName("system_prompt");
         builder.Property(c => c.AgentPath).HasColumnName("agent_path");
+        builder.Property(c => c.MaxTurns).HasColumnName("max_turns");
     }
 }