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/components/header/header.component.ts

@@ -14,10 +14,12 @@ import { FeatureConfigService } from '../../core/config/feature-config.service';
 import { DEFAULT_HEADER_CONFIG, DEFAULT_USER_EXPERIENCE_CONFIG } from '../../shared/models/config';
 import { StaticPageResolverService } from '../../core/config/static-page-resolver.service';
 import { IconComponent } from '../../shared/ui/icon/icon.component';
+import { AuthService } from '../../services/auth.service';
+import { TelegramLoginComponent } from '../telegram-login/telegram-login.component';
 
 @Component({
   selector: 'app-header',
-  imports: [RouterLink, RouterLinkActive, LogoComponent, LanguageSelectorComponent, RegionSelectorComponent, LangRoutePipe, TranslatePipe, IconComponent],
+  imports: [RouterLink, RouterLinkActive, LogoComponent, LanguageSelectorComponent, RegionSelectorComponent, LangRoutePipe, TranslatePipe, IconComponent, TelegramLoginComponent],
   templateUrl: './header.component.html',
   styleUrls: ['./header.component.scss'],
   changeDetection: ChangeDetectionStrategy.OnPush
@@ -35,7 +37,9 @@ export class HeaderComponent {
   private configService = inject(ConfigService);
   private featureConfig = inject(FeatureConfigService);
   private staticPageResolver = inject(StaticPageResolverService);
+  private authService = inject(AuthService);
 
+  readonly isAuthenticated = this.authService.isAuthenticated;
   readonly wishlistCount = this.uxFacade.wishlistCount;
   readonly compareCount = this.uxFacade.compareCount;
   readonly userExperienceConfig = computed(() => this.resolveUserExperienceConfig());
@@ -118,6 +122,14 @@ export class HeaderComponent {
     this.router.navigate([`/${lang}/compare`]);
   }
 
+  login(): void {
+    this.authService.requestLogin();
+  }
+
+  logout(): void {
+    this.authService.logout();
+  }
+
   navigateToStatic(route: string): void {
     this.closeMenu();
     const lang = this.langService.currentLanguage();