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/asynckit/lib/readable_parallel.js

@@ -0,0 +1,25 @@
+var parallel = require('../parallel.js');
+
+// API
+module.exports = ReadableParallel;
+
+/**
+ * Streaming wrapper to `asynckit.parallel`
+ *
+ * @param   {array|object} list - array or object (named list) to iterate over
+ * @param   {function} iterator - iterator to run
+ * @param   {function} callback - invoked when all elements processed
+ * @returns {stream.Readable#}
+ */
+function ReadableParallel(list, iterator, callback)
+{
+  if (!(this instanceof ReadableParallel))
+  {
+    return new ReadableParallel(list, iterator, callback);
+  }
+
+  // turn on object mode
+  ReadableParallel.super_.call(this, {objectMode: true});
+
+  this._start(parallel, list, iterator, callback);
+}