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/date-fns/_lib/requiredArgs/index.js

@@ -0,0 +1,14 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = requiredArgs;
+
+function requiredArgs(required, args) {
+  if (args.length < required) {
+    throw new TypeError(required + ' argument' + (required > 1 ? 's' : '') + ' required, but only ' + args.length + ' present');
+  }
+}
+
+module.exports = exports.default;