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-admin-v2/node_modules/mimic-response/index.d.ts

@@ -0,0 +1,17 @@
+import {IncomingMessage} from 'http';
+
+/**
+Mimic a [Node.js HTTP response stream](https://nodejs.org/api/http.html#http_class_http_incomingmessage)
+
+Makes `toStream` include the properties from `fromStream`.
+
+@param fromStream - The stream to copy the properties from.
+@param toStream - The stream to copy the properties to.
+@return The same object as `toStream`.
+*/
+declare function mimicResponse<T extends NodeJS.ReadableStream>(
+	fromStream: IncomingMessage, // eslint-disable-line @typescript-eslint/prefer-readonly-parameter-types
+	toStream: T,
+): T & IncomingMessage;
+
+export = mimicResponse;