feat(admin): sprint 19 admin dashboard, routing, i18n

- Add admin dashboard feature (models/gateway/facade/components/page)
- Wire admin/products routes and backoffice coming-soon placeholders
- Add lastPublishedAt to ProjectEditorFacade/state
- Add dashboard i18n keys (en/ru/hy) and docs/ADMIN.md

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/features/project-editor/services/project-validator.service.ts

@@ -8,6 +8,8 @@ export interface ProjectValidationIssue {
 
 const HEX_COLOR = /^#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$/;
 const HTTP_URL = /^https?:\/\/\S+$/;
+const KNOWN_PLATFORM_LAYOUT_TYPES = new Set(['default', 'sidebar-left', 'carousel-home', 'minimal']);
+const KNOWN_SECTION_LAYOUT_STRATEGIES = new Set(['stack', 'grid', 'hero', 'carousel', 'split']);
 
 @Injectable({ providedIn: 'root' })
 export class ProjectValidator {
@@ -20,6 +22,8 @@ export class ProjectValidator {
       ...this.homepageIssues(bootstrap),
       ...this.navigationIssues(bootstrap),
       ...this.colorIssues(bootstrap),
+      ...this.translationIssues(bootstrap),
+      ...this.layoutIssues(bootstrap),
     ];
   }
 
@@ -69,4 +73,35 @@ export class ProjectValidator {
     const invalid = Object.values(bootstrap.theme.palette).some(value => !HEX_COLOR.test(value));
     return invalid ? [{ code: 'invalid-colors', message: 'builder.validationInvalidColors' }] : [];
   }
+
+  private translationIssues(bootstrap: BootstrapConfig): ProjectValidationIssue[] {
+    const otherLocales = bootstrap.localization.supportedLocales.filter(locale => locale !== bootstrap.localization.defaultLocale);
+    if (otherLocales.length === 0) {
+      return [];
+    }
+
+    const headerMissing = bootstrap.navigation.header.some(item => {
+      const label = item.label;
+      if (!label || typeof label !== 'object') {
+        return false;
+      }
+      return otherLocales.some(locale => !label[locale]?.trim());
+    });
+
+    const staticPages = bootstrap.staticPages;
+    const staticPagesMissing = staticPages && !Array.isArray(staticPages)
+      ? Object.values(staticPages).some(page => page.translations && otherLocales.some(locale => !page.translations![locale]))
+      : false;
+
+    return headerMissing || staticPagesMissing ? [{ code: 'missing-translations', message: 'builder.validationMissingTranslations' }] : [];
+  }
+
+  private layoutIssues(bootstrap: BootstrapConfig): ProjectValidationIssue[] {
+    const invalidPlatformLayout = !!bootstrap.layout?.type && !KNOWN_PLATFORM_LAYOUT_TYPES.has(bootstrap.layout.type);
+    const invalidSectionLayout = bootstrap.pages.some(page =>
+      page.sections.some(section => !!section.layout?.strategy && !KNOWN_SECTION_LAYOUT_STRATEGIES.has(section.layout.strategy)),
+    );
+
+    return invalidPlatformLayout || invalidSectionLayout ? [{ code: 'invalid-layouts', message: 'builder.validationInvalidLayouts' }] : [];
+  }
 }