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]>

composer.json

@@ -18,6 +18,7 @@
 		"b13/container": "^4.1",
 		"ep/ep-products": "@dev",
 		"ep/ep-theme": "@dev",
+		"fluidtypo3/vhs": "^8.0",
 		"ssch/typo3-encore": "^7.0",
 		"typo3/cms-backend": "^13.4",
 		"typo3/cms-belog": "^13.4",