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/lodash/_createInverter.js

@@ -0,0 +1,17 @@
+var baseInverter = require('./_baseInverter');
+
+/**
+ * Creates a function like `_.invertBy`.
+ *
+ * @private
+ * @param {Function} setter The function to set accumulator values.
+ * @param {Function} toIteratee The function to resolve iteratees.
+ * @returns {Function} Returns the new inverter function.
+ */
+function createInverter(setter, toIteratee) {
+  return function(object, iteratee) {
+    return baseInverter(object, setter, toIteratee(iteratee), {});
+  };
+}
+
+module.exports = createInverter;