feat(cms): add static pages module

docs/platform/11-navigation-system.md

@@ -1,3 +1,8 @@
+## CMS Navigation Integration
+- Static pages with `showInHeader: true` may appear in header navigation automatically.
+- Static pages with `showInFooter: true` may be grouped into footer sections using `footerGroup`.
+- Social links remain footer-config driven and can coexist with CMS page groups.
+- Navigation stays configuration-driven; no marketplace-specific page names are hardcoded in frontend.
 # 11. Система навигации
 
 ## Назначение

docs/platform/12-static-pages-system.md

@@ -1,3 +1,8 @@
+## CMS Upgrade
+- Static pages now support unlimited bootstrap-driven entries under `staticPages`.
+- Each page may define slug, visibility, header/footer/sitemap flags, icon, order, translations, HTML and SEO metadata.
+- Frontend resolves pages dynamically from bootstrap instead of hardcoded page names.
+- Header and footer may consume the same static page registry without duplicating page definitions.
 # 12. Система статических страниц
 
 ## Назначение