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/Form/AbstractMappedFinisher.php

@@ -24,7 +24,7 @@ abstract class AbstractMappedFinisher extends AbstractFinisher
             }
 
             [$remote, $local] = $parts;
-            if ('' === $remote || '' === $local) {
+            if ('' === $local) {
                 continue;
             }
 
@@ -81,7 +81,7 @@ abstract class AbstractMappedFinisher extends AbstractFinisher
 
         $collected = [];
         foreach ($elements as $identifier => $element) {
-            if (true === in_array($identifier, $skip, true) || false === array_key_exists($identifier, $formValues)) {
+            if (in_array($identifier, $skip, true) || false === array_key_exists($identifier, $formValues)) {
                 continue;
             }
 
@@ -94,7 +94,7 @@ abstract class AbstractMappedFinisher extends AbstractFinisher
             if ('' === $label) {
                 $label = $identifier;
             }
-            if (true === array_key_exists($label, $collected)) {
+            if (array_key_exists($label, $collected)) {
                 $label .= ' (' . $identifier . ')';
             }
 
@@ -111,7 +111,7 @@ abstract class AbstractMappedFinisher extends AbstractFinisher
      */
     protected function normalizeValue($value, string $identifier)
     {
-        if (true === is_array($value)) {
+        if (is_array($value)) {
             $normalized = [];
             foreach ($value as $item) {
                 $item = $this->normalizeValue($item, $identifier);
@@ -133,7 +133,7 @@ abstract class AbstractMappedFinisher extends AbstractFinisher
             return $resource?->getName();
         }
 
-        if (true === is_object($value)) {
+        if (is_object($value)) {
             $this->logWarning('Form value skipped while collecting labeled values: unsupported type.', [
                 'element' => $identifier,
                 'class' => $value::class,