feat(daily-prep): add DailyPrepMaxTasks app setting

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ClaudeDo.Data/Configuration/AppSettingsEntityConfiguration.cs

@@ -41,6 +41,9 @@ public class AppSettingsEntityConfiguration : IEntityTypeConfiguration<AppSettin
         builder.Property(s => s.StandupWeekday).HasColumnName("standup_weekday")
             .IsRequired().HasDefaultValue((int)DayOfWeek.Wednesday);
 
+        builder.Property(s => s.DailyPrepMaxTasks)
+            .HasColumnName("daily_prep_max_tasks").IsRequired().HasDefaultValue(5);
+
         builder.HasData(new AppSettingsEntity { Id = AppSettingsEntity.SingletonId });
     }
 }