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/layouts/containers/dynamic-page-layout.component.ts

@@ -9,7 +9,7 @@ import { ResolvedWidget } from '../../widgets/contracts/widget-component.contrac
 import { WidgetHostService } from '../../dynamic-renderer/widget-host/widget-host.service';
 import { LanguageService } from '../../services/language.service';
 import { Category } from '../../core/categories/models/category-domain.model';
-import { AuthService } from '../../services/auth.service';
+import { AuthService } from '@marketplaces/auth';
 
 @Component({
   selector: 'app-dynamic-page-layout',