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.spec.ts

@@ -6,7 +6,7 @@ import { of } from 'rxjs';
 import { BootstrapConfig } from '../../shared/models/config';
 import { CONFIG_PROVIDER } from '../../core/config/config-provider.token';
 import { ConfigService } from '../../core/config/config.service';
-import { AuthService } from '../../services/auth.service';
+import { AuthService, AUTH_API_URL } from '@marketplaces/auth';
 import { HeaderComponent } from './header.component';
 
 function makeBootstrap(): BootstrapConfig {
@@ -52,6 +52,7 @@ describe('HeaderComponent profile control (login/logout gating regression)', ()
         provideHttpClient(),
         provideHttpClientTesting(),
         { provide: CONFIG_PROVIDER, useValue: { loadBootstrap: () => of(makeBootstrap()) } },
+        { provide: AUTH_API_URL, useValue: 'https://test.local' },
         { provide: AuthService, useValue: fakeAuth },
       ],
     });