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-dom/modules/index.js

@@ -0,0 +1,21 @@
+export {
+  MemoryRouter,
+  Prompt,
+  Redirect,
+  Route,
+  Router,
+  StaticRouter,
+  Switch,
+  generatePath,
+  matchPath,
+  withRouter,
+  useHistory,
+  useLocation,
+  useParams,
+  useRouteMatch
+} from "react-router";
+
+export { default as BrowserRouter } from "./BrowserRouter.js";
+export { default as HashRouter } from "./HashRouter.js";
+export { default as Link } from "./Link.js";
+export { default as NavLink } from "./NavLink.js";