refactor: apply TYPO3 13 Rector and Fractor migrations

Automated migrations from rector.php and fractor.php (TCA, Extbase
controllers and annotations, ViewHelpers, QueryBuilder, FlexForms,
TypoScript conditions).

Plugins stay list_type plugins: Rector switched them to content
element types, which needs a tt_content migration. That is deferred to
the TYPO3 14 step, where list_type is removed.

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

packages/ep_theme/Classes/Domain/Model/Page.php

@@ -9,12 +9,12 @@ class Page extends AbstractEntity
     /**
      * @var int
      */
-    protected $uid;
+    protected ?int $uid = null;
 
     /**
      * @var int
      */
-    protected $pid;
+    protected ?int $pid = null;
 
     /**
      * @var bool