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/features/admin/users/services/admin-users-local.gateway.ts

@@ -3,7 +3,7 @@ import { Observable, of } from 'rxjs';
 import { delay } from 'rxjs/operators';
 import { AdminInvitation, AdminUserRoleRecord, AdminSession, AdminUser, AdminUserAuditEntry, AdminUserScope, AdminUserStatus } from '../models/admin-user.model';
 import { AdminUsersGateway } from './admin-users-gateway.interface';
-import { AdminAuthService } from '../../../../core/admin-auth/admin-auth.service';
+import { AdminAuthService } from '@marketplaces/auth';
 
 const BUILT_IN_ROLES: AdminUserRoleRecord[] = [
   { id: 'owner', name: 'Owner', permissions: ['*'], builtIn: true },