Product text import from agency XLSX workbooks

VITEC Import module: Products tab is now a searchable/sortable product
overview. "Edit Product" opens an XLSX upload with per-field source
mapping (component + cell), old/new preview and checkbox apply via
DataHandler; the mapping and manual matches are persisted and preselect
the next workbook. Category workbooks are detected and rejected.

- new: ProductXlsxReader (PhpSpreadsheet), ProductTextImportController,
  Products/ProductTexts templates, 4 module routes
- related products: per-pair card text in new side table
  tx_vitec_product_related_text (survives MM rewrites), emitted as
  `cardtext` in the product JSON; missing MM relations added add-only
- card copy read from Body Copy (D) with fallback to CTA/Card Copy (E) -
  the workbooks fill either depending on row type
- product detail page <title> now uses seotitle with title fallback
  (provider made singleton and fed from the JSON renderer)
- per-user recent-search badges; last loaded workbook stored per product
  (tx_vitec_product_workbook), Edit Product reopens on it
- composer: add phpoffice/phpspreadsheet ^5.9
- diagnostics: migrations/check_workbook.php

packages/vitec/Configuration/Backend/Modules.php

@@ -3,6 +3,7 @@
 declare(strict_types=1);
 
 use Evomedien\Vitec\Controller\Backend\ImportController;
+use Evomedien\Vitec\Controller\Backend\ProductTextImportController;
 use Evomedien\Vitec\Controller\Backend\WordPressImportController;
 use Evomedien\Vitec\Controller\OgImageController;
 
@@ -34,6 +35,20 @@ return [
                 'target' => ImportController::class . '::seoUploadAction',
                 'methods' => ['POST'],
             ],
+            'products' => [
+                'target' => ProductTextImportController::class . '::productsAction',
+            ],
+            'product_edit' => [
+                'target' => ProductTextImportController::class . '::productEditAction',
+            ],
+            'product_preview' => [
+                'target' => ProductTextImportController::class . '::productPreviewAction',
+                'methods' => ['POST'],
+            ],
+            'product_apply' => [
+                'target' => ProductTextImportController::class . '::productApplyAction',
+                'methods' => ['POST'],
+            ],
         ],
     ],
     'web_vitecwpimport' => [