refactor: remove dead code via Rector

rector.php gets the deadCode set: @param/@return/@var tags that only
repeat native types, === true comparisons, three unused constructor
dependencies (DateService, ProductDataService, AjaxWatchlistController),
the unused reseller lookup in ContextProcessor and an always-false check
in AbstractMappedFinisher (trimExplode with removeEmpty never yields an
empty remote name).

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/Domain/Model/Page.php

@@ -6,15 +6,9 @@ use TYPO3\CMS\Extbase\DomainObject\AbstractEntity;
 
 class Page extends AbstractEntity
 {
-    /**
-     * @var int
-     */
     #[\Override]
     protected ?int $uid = null;
 
-    /**
-     * @var int
-     */
     #[\Override]
     protected ?int $pid = null;