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/i18n/translations.ts

@@ -10,6 +10,8 @@ export interface Translations {
     compare: string;
     openMenu: string;
     closeMenu: string;
+    login: string;
+    logout: string;
   };
   footer: {
     description: string;
@@ -1917,6 +1919,16 @@ export interface Translations {
     lastPublished: string;
     syncStatus: string;
   };
+  adminReports: {
+    sales: string;
+    topProducts: string;
+    marketplaceHealth: string;
+  };
+  adminSettings: {
+    density: string;
+    densityExplain: string;
+    densityCompact: string;
+  };
   adminAnalytics: {
     topProductsEmptyTitle: string;
     topProductsEmptyDescription: string;
@@ -2068,6 +2080,8 @@ export interface Translations {
       monitoring: { title: string; description: string };
       analytics: { title: string; description: string };
       sellerManagement: { title: string; description: string };
+      reports: { title: string; description: string };
+      settings: { title: string; description: string };
     };
   };
   adminSellerManagement: {