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/axios/lib/helpers/readBlob.js

@@ -0,0 +1,15 @@
+const { asyncIterator } = Symbol;
+
+const readBlob = async function* (blob) {
+  if (blob.stream) {
+    yield* blob.stream();
+  } else if (blob.arrayBuffer) {
+    yield await blob.arrayBuffer();
+  } else if (blob[asyncIterator]) {
+    yield* blob[asyncIterator]();
+  } else {
+    yield blob;
+  }
+};
+
+export default readBlob;