refactor: private instead of protected where nothing relies on it, constructor promotion

Members (properties, methods, constants) become private when they are
declared in the class itself, no parent class or interface declares them,
no ancestor in packages/ uses them and the class has no subclass in
packages/: 115 members in 36 files. Extbase domain objects keep protected
properties, AbstractDomainObject sets them from the parent class.

With the properties private, Rector's constructor promotion now also
applies to the controllers and services that still assigned their
dependencies by hand (26 files).

Checked locally: frontend crawl (~1,900 URLs) and the backchannel APIs
render the same as before.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/ep_theme/Classes/ViewHelpers/ContainerViewHelper.php

@@ -10,7 +10,7 @@ class ContainerViewHelper extends AbstractViewHelper
     /**
      * @var int[]
      */
-    protected static $scale = [
+    private static $scale = [
         'default' => 0,
         'small' => 8,
         'large' => 16,
@@ -25,7 +25,7 @@ class ContainerViewHelper extends AbstractViewHelper
     /**
      * @var array
      */
-    protected static $columnsWithoutContainers = [ 0, 1, 3 ];
+    private static $columnsWithoutContainers = [ 0, 1, 3 ];
 
     public function initializeArguments()
     {