feat: Passwordless cross-device authentication

- Arkitektur: docs/auth/passwordless-architecture.md
- Backend: iom/quixzoom-auth-service/ (FastAPI + Redis)
- Webb: quixzoom-market-pages/se/login/ (QR-kod + polling)
- App: iom/quixzoom-app/src/features/auth/ (push + deep links)

Flöde: QR-kod → app-godkännande → webb-inloggad

landvex/node_modules/validator/es/lib/isBase64.js

@@ -0,0 +1,23 @@
+import assertString from './util/assertString';
+import merge from './util/merge';
+var base64WithPadding = /^[A-Za-z0-9+/]+={0,2}$/;
+var base64WithoutPadding = /^[A-Za-z0-9+/]+$/;
+var base64UrlWithPadding = /^[A-Za-z0-9_-]+={0,2}$/;
+var base64UrlWithoutPadding = /^[A-Za-z0-9_-]+$/;
+export default function isBase64(str, options) {
+  var _options;
+  assertString(str);
+  options = merge(options, {
+    urlSafe: false,
+    padding: !((_options = options) !== null && _options !== void 0 && _options.urlSafe)
+  });
+  if (str === '') return true;
+  if (options.padding && str.length % 4 !== 0) return false;
+  var regex;
+  if (options.urlSafe) {
+    regex = options.padding ? base64UrlWithPadding : base64UrlWithoutPadding;
+  } else {
+    regex = options.padding ? base64WithPadding : base64WithoutPadding;
+  }
+  return (!options.padding || str.length % 4 === 0) && regex.test(str);
+}