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.App/Program.cs

@@ -21,7 +21,8 @@ sealed class Program
 
         using (var scope = services.CreateScope())
         {
-            scope.ServiceProvider.GetRequiredService<ClaudeDoDbContext>().Database.Migrate();
+            ClaudeDoDbContext.MigrateAndConfigure(
+                scope.ServiceProvider.GetRequiredService<ClaudeDoDbContext>());
         }
 
         try