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/ViewHelpers/MyEpUrlViewHelper.php

@@ -13,7 +13,6 @@ class MyEpUrlViewHelper extends AbstractViewHelper
      * @param array $arguments
      * @param \Closure $renderChildrenClosure
      * @param RenderingContextInterface $renderingContext
-     * @return string
      */
     public function render(): string
     {