feat: migrate telegram + ed25519 auth implementation into @marketplaces/auth

packages/auth/src/telegram/admin-auth.guard.ts

@@ -0,0 +1,15 @@
+import { inject } from '@angular/core';
+import { CanActivateFn } from '@angular/router';
+import { AdminAuthService } from './admin-auth.service';
+
+/** Guards `/admin/**`-style routes. Never shares state with the customer auth guard/service. */
+export const adminAuthGuard: CanActivateFn = () => {
+  const adminAuth = inject(AdminAuthService);
+
+  if (adminAuth.isAuthenticated()) {
+    return true;
+  }
+
+  adminAuth.requestLogin();
+  return false;
+};