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/pstree.remy/tests/fixtures/index.js

@@ -0,0 +1,13 @@
+const spawn = require('child_process').spawn;
+function run() {
+  spawn(
+    'sh',
+    ['-c', 'node -e "setInterval(() => console.log(`running`), 200)"'],
+    {
+      stdio: 'pipe',
+    }
+  );
+}
+
+var runCallCount = process.argv[2] || 1;
+for (var i = 0; i < runCallCount; i++) run();