feat(static-pages): extend data model with route/enabled/status/media/SEO

Milestone 1 of the Static Pages Module sprint.

- StaticPageConfig / ContentPage / ContentPageBootstrapInput gain: explicit
  editable route (defaults from slug, independently overridable), enabled
  (master on/off), status: 'draft'|'published' (per-page publish lifecycle,
  independent of the whole-bootstrap draft/publish cycle), customTemplate,
  heroImage/thumbnail/gallery, and seo.robots.
- ContentPageService: normalizePage/normalizePages default missing
  enabled/status to enabled+published so existing bootstrap data never gets
  silently un-published; only the editor's createPage() opts a brand-new page
  into 'draft'. Legacy array-format pages get the same treatment.
- resolvePage now returns null (storefront 404) for a disabled or draft page,
  regardless of whether the surrounding bootstrap itself is published -
  affects the storefront static-page route AND the auto-generated footer nav
  group (both go through this same resolver), which is the correct behavior.
- validatePages extended: duplicateRoutes (route can now diverge from slug),
  invalidHtml, invalidSeo (canonical/ogImage URL shape, known robots tokens).
- New schema/validators/primitives.validateHtml: stack-based tag-balance
  check (void/self-closing elements skipped, comments stripped). Caught and
  fixed a real bug during its own spec run: the initial implementation popped
  the stack back to the nearest matching ancestor on a mismatched closing
  tag, which silently swallowed a genuinely unclosed inner tag instead of
  flagging it - now a closing tag must match the top of the stack exactly.
- toBootstrapRecord serializes the new fields; visible mirrors enabled so any
  reader of the older field name stays truthful.
- Specs: content-page.service.spec.ts (new), primitives.spec.ts (validateHtml).

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

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

src/app/features/content-management/models/content-page.model.ts

@@ -8,6 +8,7 @@ export interface ContentPageSeoConfig {
   ogTitle?: string;
   ogDescription?: string;
   ogImage?: string;
+  robots?: string;
 }
 
 export interface ContentPageTranslation {
@@ -16,9 +17,13 @@ export interface ContentPageTranslation {
   seo?: ContentPageSeoConfig;
 }
 
+export type ContentPageStatus = 'draft' | 'published';
+
 export interface ContentPage {
   id: string;
   slug: string;
+  /** Editable independently of `slug`; defaults from it but may diverge (e.g. legacy redirects). */
+  route: string;
   title: string;
   icon?: string;
   order: number;
@@ -34,11 +39,20 @@ export interface ContentPage {
   footerGroup?: string;
   translations: Record<string, ContentPageTranslation>;
   seo?: ContentPageSeoConfig;
+  /** Master on/off switch; a disabled page never resolves on the storefront. */
+  enabled: boolean;
+  /** Per-page publish lifecycle, independent of the whole-bootstrap draft/publish cycle. */
+  status: ContentPageStatus;
+  customTemplate?: string;
+  heroImage?: string;
+  thumbnail?: string;
+  gallery?: string[];
 }
 
 export interface ContentPageBootstrapInput {
   id: string;
   slug: string;
+  route?: string;
   title?: string | LocalizedTextContent;
   showInFooter?: boolean;
   showInHeader?: boolean;
@@ -55,4 +69,10 @@ export interface ContentPageBootstrapInput {
   translations?: Record<string, ContentPageTranslation>;
   html?: string | LocalizedHtmlContent;
   seo?: ContentPageSeoConfig | { title?: string | LocalizedTextContent; description?: string | LocalizedTextContent; keywords?: string; canonical?: string; ogTitle?: string | LocalizedTextContent; ogDescription?: string | LocalizedTextContent; ogImage?: string; robots?: string; metaTags?: Array<{ name?: string; property?: string; content: string }>; };
+  enabled?: boolean;
+  status?: ContentPageStatus;
+  customTemplate?: string;
+  heroImage?: string;
+  thumbnail?: string;
+  gallery?: string[];
 }