feat(packages): add standalone auth and payment

packages/payment/test/domain-context.test.mjs

@@ -0,0 +1,9 @@
+import '@angular/compiler';
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { MARKETPLACE_DOMAIN_HEADER, normalizeMarketplaceDomain } from '../dist/fesm2022/marketplaces-payment.mjs';
+
+test('sends the full normalized storefront host as project context', () => {
+  assert.equal(MARKETPLACE_DOMAIN_HEADER, 'X-Marketplace-Domain');
+  assert.equal(normalizeMarketplaceDomain(' Store1.Example.COM. '), 'store1.example.com');
+});