fix: render product detail pages on TYPO3 13

- ObjectManager replaced by GeneralUtility::makeInstance(), the
  services fetched that way are public
- QueryBuilder::add('orderBy') and the remaining execute() calls,
  detailAction returns a response
- PHP 8 warnings for missing array keys (same values as on PHP 7.4)
- Webcam images are external URLs: plain img tag, f:image only takes
  FAL files
- typo3_encore 7 needs the PKG:ssch/typo3-encore: prefix and
  external = 1 so TYPO3's path check does not drop the entry
- CDN image rewriting as a middleware instead of EXT:replacer, which
  is not PHP 8.5 clean; same pattern, only for page responses
- vhs 8 for the ViewHelpers the templates use
- OpenGraph meta tag manager skips the backend
- myEpUrl with trailing slash as in production

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

config/system/settings.php

@@ -54,9 +54,12 @@ return [
             'myEpApiUrlAuthorize' => '',
             'myEpApiUrlToken' => '',
             'myEpStagingUrl' => 'https://my.ep-reisen.net',
-            'myEpUrl' => 'https://my.ep-reisen.de',
+            'myEpUrl' => 'https://my.ep-reisen.de/',
             'searchPageUid' => '0',
         ],
+        'ep_theme' => [
+            'cdnBaseUrl' => 'https://cdn.ep-reisen.de/',
+        ],
         'extensionmanager' => [
             'automaticInstallation' => '1',
             'offlineMode' => '0',