refactor: code quality via Rector, strict types where safe

rector.php gets the codeQuality set: declare(strict_types=1) in the 85
files where Rector finds no call relying on scalar type juggling (mostly
TCA and configuration, models, the content feed API and the import
command), "or die" as "|| die", instanceof instead of null checks for
object types, early returns and self:: in final classes.

Hotel::setRooms() goes instead of getting the property Rector wanted to
declare: nothing calls it, and there is no rooms column any more.

Checked locally: cache warmup, the ep:* commands load, 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/IconViewHelper.php

@@ -22,7 +22,7 @@ class IconViewHelper extends AbstractTagBasedViewHelper
 
     public function render(): string
     {
-        $imageService = self::getImageService();
+        $imageService = $this->getImageService();
         $sprite = $imageService->getImage('EXT:ep_theme/Resources/Public/images/icons_sprite.svg', null, false);
         $imageUrl = $sprite->getPublicUrl();
 
@@ -33,7 +33,7 @@ class IconViewHelper extends AbstractTagBasedViewHelper
         return $this->tag->render();
     }
 
-    private static function getImageService()
+    private function getImageService()
     {
         return GeneralUtility::makeInstance(ImageService::class);
     }