fix(data): address code review findings

- Fix sort order regression in GetByListIdAsync (was descending, should be ascending)
- Restore WAL mode pragma (was silently dropped in EF migration)
- Add existing-DB compatibility shim in MigrateAndConfigure (baselines InitialCreate
  migration for databases created by the old schema.sql)
- Remove dead AddDbContext/AddScoped registrations from Worker (only IDbContextFactory
  is used by singleton consumers)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/ClaudeDo.Worker/Program.cs

@@ -17,16 +17,8 @@ builder.Host.UseWindowsService(o => o.ServiceName = "ClaudeDoWorker");
 
 builder.Services.AddDbContextFactory<ClaudeDoDbContext>(opt =>
     opt.UseSqlite($"Data Source={cfg.DbPath}"));
-builder.Services.AddDbContext<ClaudeDoDbContext>(opt =>
-    opt.UseSqlite($"Data Source={cfg.DbPath}"));
 
 builder.Services.AddSingleton(cfg);
-builder.Services.AddScoped<TagRepository>();
-builder.Services.AddScoped<ListRepository>();
-builder.Services.AddScoped<TaskRepository>();
-builder.Services.AddScoped<SubtaskRepository>();
-builder.Services.AddScoped<WorktreeRepository>();
-builder.Services.AddScoped<TaskRunRepository>();
 builder.Services.AddHostedService<StaleTaskRecovery>();
 builder.Services.AddSignalR();
 
@@ -54,7 +46,8 @@ var app = builder.Build();
 
 using (var scope = app.Services.CreateScope())
 {
-    scope.ServiceProvider.GetRequiredService<ClaudeDoDbContext>().Database.Migrate();
+    ClaudeDoDbContext.MigrateAndConfigure(
+        scope.ServiceProvider.GetRequiredService<ClaudeDoDbContext>());
 }
 
 app.MapHub<WorkerHub>("/hub");