feat: close stub-page gaps - profile login/logout, admin Reports/Settings, Help/Docs links

Sprint A: storefront header profile control (login/logout only, no menu),
wired to existing customer Telegram auth (AuthService).

Sprint B: backoffice/reports page, reuses AdminAnalyticsFacade (Sales,
Top Products, Marketplace Health cards + CSV export).

Sprint C: backoffice/settings page, admin UI density preference
(comfortable/compact), localStorage-persisted, applied to app-table
across all admin list pages.

Sprint D: admin bottom-nav Help -> mailto using existing supportEmail,
Documentation -> external link via new TenantConfig.documentationUrl.
AdminNavLink gains externalHref for non-routerLink nav entries.

Docs: docs/GLOBAL-SPRINT-PLAN.md tracks the full sprint breakdown.
docs/COMING-SOON-AUDIT.md removed, folded into docs/KNOWN-ISSUES.md.
docs/BACKEND.md updated with the new documentationUrl bootstrap field.

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

src/app/features/admin/dashboard/facade/admin-dashboard.facade.ts

@@ -31,7 +31,7 @@ const SHORTCUTS: AdminDashboardShortcut[] = [
   { id: 'static-pages', icon: 'edit', labelKey: 'dashboard.actionStaticPages', route: ['backoffice', 'static-pages'] },
   { id: 'orders', icon: 'cart', labelKey: 'dashboard.actionOrders', route: ['backoffice', 'orders'] },
   { id: 'users', icon: 'users', labelKey: 'dashboard.actionUsers', route: ['backoffice', 'users'] },
-  { id: 'settings', icon: 'settings', labelKey: 'dashboard.shortcutSettings', route: [], comingSoon: true },
+  { id: 'settings', icon: 'settings', labelKey: 'dashboard.shortcutSettings', route: ['backoffice', 'settings'] },
   { id: 'media-library', icon: 'images', labelKey: 'dashboard.actionMediaLibrary', route: ['backoffice', 'media'] },
   { id: 'content', icon: 'alignLeft', labelKey: 'dashboard.shortcutContent', route: ['edit', 'static-pages'] },
 ];