feat(static-pages): CRUD completion + search/filter/bulk actions

Milestone 2 of the Static Pages Module sprint.

- StaticPagesEditorComponent: duplicate page, confirm-before-delete/bulk-
  delete (matches the resetDraft confirm pattern), route/enabled/customTemplate/
  media(hero/thumbnail/gallery) fields wired into the card, per-page publish/
  unpublish action, status + duplicate-route/invalid-html/invalid-seo badges.
- Search (id/slug/route/title across all locales), filter by status
  (draft/published) and by locale (hides pages missing a translation for the
  selected locale) - all local computed() filters, no new service.
- Bulk selection (per-row + select-all-visible checkboxes) with bulk delete/
  enable/disable/publish/unpublish, one updateBootstrap() call each.
- Correctness note: introduced `allPages` (unfiltered) vs `pages` (filtered
  view) computeds. Every mutation (create/duplicate/delete/move/bulk) reads
  from allPages(), never the filtered pages() - reading from the filtered
  view would have silently deleted whatever an active search/filter hid on
  the next persist(). Documented inline on persist() as a guardrail for
  future edits.
- Fixed a template compile error found by the build gate: Angular templates
  don't support inline arrow functions in binding expressions
  ((ngModelChange)="...map(v => v.trim())..." failed to parse) - moved the
  gallery CSV-parsing into a component method (updateGallery).
- SEO robots field added to the page card (validated against a known-token
  set from M1).
- i18n: staticPages.* extended (search/filter/bulk/route/enabled/status/
  media/robots/disabled labels) across the interface + en/ru/hy.

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

@@ -719,6 +719,33 @@ export const en: Translations = {
     backHome: 'Back to home',
     duplicateSlug: 'Duplicate slugs are not allowed.',
     emptyTitle: 'Each page must have at least one title.',
+    duplicateRoute: 'Two or more pages share the same route.',
+    invalidHtml: 'This page has malformed HTML content.',
+    invalidSeo: 'This page has an invalid SEO field (canonical/OG image URL or robots value).',
+    searchPlaceholder: 'Search pages…',
+    filterAll: 'All statuses',
+    filterAllLocales: 'All languages',
+    confirmDeletePage: 'Delete this page? This cannot be undone.',
+    confirmBulkDelete: 'Delete the selected pages? This cannot be undone.',
+    duplicatePage: 'Duplicate',
+    selectAll: 'Select all',
+    selectedCount: 'selected',
+    bulkDelete: 'Delete selected',
+    bulkEnable: 'Enable selected',
+    bulkDisable: 'Disable selected',
+    bulkPublishAction: 'Publish selected',
+    bulkUnpublish: 'Unpublish selected',
+    routeLabel: 'Route',
+    enabledLabel: 'Enabled',
+    statusLabel: 'Status',
+    publishPageAction: 'Publish page',
+    unpublishPageAction: 'Unpublish page',
+    heroImageLabel: 'Hero image',
+    thumbnailLabel: 'Thumbnail',
+    galleryLabel: 'Gallery',
+    customTemplateLabel: 'Custom template',
+    seoRobotsLabel: 'Robots',
+    disabledBadge: 'Disabled',
   },
   widgets: {
     unavailable: 'Widget unavailable',