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/react-router/modules/Lifecycle.js

@@ -0,0 +1,21 @@
+import React from "react";
+
+class Lifecycle extends React.Component {
+  componentDidMount() {
+    if (this.props.onMount) this.props.onMount.call(this, this);
+  }
+
+  componentDidUpdate(prevProps) {
+    if (this.props.onUpdate) this.props.onUpdate.call(this, this, prevProps);
+  }
+
+  componentWillUnmount() {
+    if (this.props.onUnmount) this.props.onUnmount.call(this, this);
+  }
+
+  render() {
+    return null;
+  }
+}
+
+export default Lifecycle;