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

node_modules/http-proxy-middleware/dist/get-plugins.js

@@ -0,0 +1,10 @@
+import { debugProxyErrorsPlugin, errorResponsePlugin, loggerPlugin, proxyEventsPlugin, } from './plugins/default/index.js';
+export function getPlugins(options) {
+    // don't load default errorResponsePlugin if user has specified their own
+    const maybeErrorResponsePlugin = options.on?.error ? [] : [errorResponsePlugin];
+    const defaultPlugins = options.ejectPlugins
+        ? [] // no default plugins when ejecting
+        : [debugProxyErrorsPlugin, proxyEventsPlugin, loggerPlugin, ...maybeErrorResponsePlugin];
+    const userPlugins = options.plugins ?? [];
+    return [...defaultPlugins, ...userPlugins];
+}