feat(product): add reusable Product Experience 2.0

Unify product details modules behind config-driven contracts so teams can
extend UX without changing runtime architecture or bootstrap flow.

Keep backward compatibility with existing product payloads by treating new
media/specification/variant/related structures as optional extensions.

Improve conversion and content discoverability with reusable actions,
typed media rendering, grouped specifications, dynamic variants, and
multi-collection related products.

src/app/i18n/en.ts

@@ -267,8 +267,27 @@ export const en: Translations = {
     reviewTextPlaceholder: 'Describe your experience',
     reviewAnonymous: 'Submit anonymously',
     reviewUploadPlaceholder: 'Photo upload is planned for a future sprint.',
+    reviewRatingRequired: 'Please select a rating.',
+    reviewTextRequired: 'Please add your review text.',
+    reviewSuccess: 'Review submitted successfully.',
     submitReview: 'Submit review',
     submitting: 'Submitting...',
+    loadMore: 'Load more',
+    showingOf: 'Showing {{shown}} of {{total}}',
+    questionsSubmissionFuture: 'Question submission can be enabled later without component changes.',
+    specificationsGeneral: 'General',
+    actionsAria: 'Product actions',
+    buyNow: 'Buy now',
+    wishlist: 'Wishlist',
+    compare: 'Compare',
+    share: 'Share',
+    notifyMe: 'Notify me',
+    zoom: 'Zoom',
+    fullscreen: 'Fullscreen',
+    pdfDocument: 'Product PDF document',
+    manualDocument: 'Product manual',
+    warrantyDocument: 'Warranty document',
+    openDocument: 'Open document',
     specificationsEmpty: 'No specifications provided yet.',
     warrantyTitle: 'Warranty and returns',
     warrantyItem1: 'Warranty terms are provided by the seller and local law.',