chore: bump default max turns from 30 to 100

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/ClaudeDo.Worker.Tests/Repositories/AppSettingsRepositoryTests.cs

@@ -20,7 +20,7 @@ public class AppSettingsRepositoryTests : IDisposable
 
         Assert.Equal(AppSettingsEntity.SingletonId, row.Id);
         Assert.Equal("sonnet", row.DefaultModel);
-        Assert.Equal(30, row.DefaultMaxTurns);
+        Assert.Equal(100, row.DefaultMaxTurns);
         Assert.Equal("bypassPermissions", row.DefaultPermissionMode);
         Assert.Equal("sibling", row.WorktreeStrategy);
         Assert.Null(row.CentralWorktreeRoot);