- Sonata admins: model_class and controller in the sonata.admin tag
  instead of the constructor arguments (42 admins), generateBaseRouteName()
  and generateBaseRoutePattern() instead of the properties. Routes and admin
  definitions checked identical.
- SortDirection instead of 'ASC'/'DESC' strings (query builders, OrderBy
  mapping attributes).
- compact_html filter: Twig's spaceless filter (removed in Twig 4), same
  output, tested against the original.
- DoctrineBundle: options removed since they are now the only behavior.
- VichUploaderBundle removed (configured but unused).

The remaining deprecations come from Sonata ORM admin and Lexik Translation.