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/translations.ts

@@ -717,6 +717,33 @@ export interface Translations {
     backHome: string;
     duplicateSlug: string;
     emptyTitle: string;
+    duplicateRoute: string;
+    invalidHtml: string;
+    invalidSeo: string;
+    searchPlaceholder: string;
+    filterAll: string;
+    filterAllLocales: string;
+    confirmDeletePage: string;
+    confirmBulkDelete: string;
+    duplicatePage: string;
+    selectAll: string;
+    selectedCount: string;
+    bulkDelete: string;
+    bulkEnable: string;
+    bulkDisable: string;
+    bulkPublishAction: string;
+    bulkUnpublish: string;
+    routeLabel: string;
+    enabledLabel: string;
+    statusLabel: string;
+    publishPageAction: string;
+    unpublishPageAction: string;
+    heroImageLabel: string;
+    thumbnailLabel: string;
+    galleryLabel: string;
+    customTemplateLabel: string;
+    seoRobotsLabel: string;
+    disabledBadge: string;
   };
   widgets: {
     unavailable: string;