feat: extract auth into @marketplaces/auth package, add backoffice admin provisioning spec

- ADR-0001: decision to extract auth/payment into shared @marketplaces/* packages
- Scaffold packages/auth, packages/payment; @marketplaces/auth now holds the real
  telegram (customer+admin QR/session) and ed25519 (future admin challenge/response)
  auth implementation, pushed to sources.vitanova.network/sdarbinyan/vitanovaPackages
- Rewire ~30 call sites to import from @marketplaces/auth; delete migrated originals
  from core/auth, core/admin-auth, services/, models/
- Replace environment coupling with AUTH_API_URL/TELEGRAM_BOT_USERNAME injection
  tokens and isDevMode(); wired as file:packages/auth pending registry publish
- Add TRACK-S §8: bootstrap per-marketplace admin login + marketplace-scoped
  sub-admin invite/role endpoints
- Build, arch:check:boundaries, and full test suite (103/103) all green

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

src/app/components/header/header.component.ts

@@ -14,7 +14,7 @@ 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 { AuthService } from '@marketplaces/auth';
 import { TelegramLoginComponent } from '../telegram-login/telegram-login.component';
 
 @Component({