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/@ungap/structured-clone/cjs/json.js

@@ -0,0 +1,24 @@
+'use strict';
+/*! (c) Andrea Giammarchi - ISC */
+
+const {deserialize} = require('./deserialize.js');
+const {serialize} = require('./serialize.js');
+
+const {parse: $parse, stringify: $stringify} = JSON;
+const options = {json: true, lossy: true};
+
+/**
+ * Revive a previously stringified structured clone.
+ * @param {string} str previously stringified data as string.
+ * @returns {any} whatever was previously stringified as clone.
+ */
+const parse = str => deserialize($parse(str));
+exports.parse = parse;
+
+/**
+ * Represent a structured clone value as string.
+ * @param {any} any some clone-able value to stringify.
+ * @returns {string} the value stringified.
+ */
+const stringify = any => $stringify(serialize(any, options));
+exports.stringify = stringify;