fix(static-pages): backfill enabled/status in export, fix missing i18n key

Independent review pass over the Static Pages Module sprint (M1-M7),
including live browser E2E per the task's own verification checklist.

- ProjectEditorFacade.normalize() now backfills enabled/status on
  record-format static pages (defaulting missing values to enabled+published,
  same rule ContentPageService.normalizePage applies for display - mirrored
  rather than imported, to avoid a project-editor <-> content-management
  circular dependency since ContentManagementFacade already depends on this
  facade). Found live: exporting a page that predates this sprint and was
  never touched/re-saved in the current session produced JSON missing
  enabled/status entirely - the editor UI and storefront resolver both
  normalize-on-read so nothing was actually broken live, but Export/Import
  fidelity should match what the editor shows. Verified fixed live (export
  now includes "enabled":true,"status":"published" for an untouched legacy
  page) and via the full gate.
- Added the missing adminCategories.chooseImage i18n key (interface +
  en/ru/hy). Found live: the media-picker "choose image" button rendered as
  the literal string "adminCategories.chooseImage" - a pre-existing,
  repo-wide bug (5 templates reference this key; none of the locale files
  ever defined it) that I propagated into a 3rd/4th/5th... well, 2 new
  occurrences by copying the existing branding-section/footer-section
  pattern into static-pages-editor. Fixed the actual defect (missing
  translation) rather than renaming the key, which would have required
  touching 2 unrelated admin components outside this sprint's scope.

Live-verified this pass: Static Pages editor renders with all new fields;
create page works (page count 4->confirmed); device preview toggles
desktop/tablet/mobile widths correctly; navigation "Insert page link"
creates a real type:'staticPage' nav item end-to-end (confirmed in the
exported JSON); export includes all Sprint X+2 fields after the fix; no
console errors throughout.

Gate: tsc --noEmit, npm test (57/57), arch:check, build all green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/i18n/en.ts

@@ -921,6 +921,9 @@ export const en: Translations = {
     emptyTitle: 'No files yet',
     emptyDescription: 'Upload an image or document to get started.',
   },
+  adminCategories: {
+    chooseImage: 'Choose image',
+  },
   adminProducts: {
     emptyTitle: 'No products found',
     emptyDescription: 'Try adjusting your filters, or create a new product.',

src/app/i18n/hy.ts

@@ -916,6 +916,9 @@ export const hy: Translations = {
     emptyTitle: 'Ֆայլեր դեռ չկան',
     emptyDescription: 'Վերբեռնեք պատկեր կամ փաստաթուղթ սկսելու համար։',
   },
+  adminCategories: {
+    chooseImage: 'Ընտրել պատկեր',
+  },
   adminProducts: {
     emptyTitle: 'Ապրանքներ չեն գտնվել',
     emptyDescription: 'Փոխեք ֆիլտրերը կամ ստեղծեք նոր ապրանք։',

src/app/i18n/ru.ts

@@ -916,6 +916,9 @@ export const ru: Translations = {
     emptyTitle: 'Пока нет файлов',
     emptyDescription: 'Загрузите изображение или документ, чтобы начать.',
   },
+  adminCategories: {
+    chooseImage: 'Выбрать изображение',
+  },
   adminProducts: {
     emptyTitle: 'Товары не найдены',
     emptyDescription: 'Измените фильтры или создайте новый товар.',

src/app/i18n/translations.ts

@@ -923,6 +923,14 @@ export interface Translations {
   // state consistency fix introduces - NOT the full adminProducts/
   // adminUsers/adminMonitoring/adminAnalytics translation surface, which is
   // still missing entirely (see docs/KNOWN-ISSUES.md, deferred to Sprint 29).
+  // Shared across branding/footer/static-pages/admin-product/admin-category media
+  // pickers - despite the namespace name, this is a generic "choose image" label,
+  // not category-specific. Renaming is a separate cleanup outside this sprint's
+  // scope; the key was previously referenced by 5 templates but never defined
+  // anywhere, so it rendered as the literal string "adminCategories.chooseImage".
+  adminCategories: {
+    chooseImage: string;
+  };
   adminProducts: {
     emptyTitle: string;
     emptyDescription: string;