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/exit-x/test/fixtures/log.js

@@ -0,0 +1,25 @@
+var exit = require('../../lib/exit');
+
+var errorCode = process.argv[2];
+var max = process.argv[3];
+var modes = process.argv.slice(4);
+
+function stdout(message) {
+  if (modes.indexOf('stdout') === -1) { return; }
+  process.stdout.write('stdout ' + message + '\n');
+}
+
+function stderr(message) {
+  if (modes.indexOf('stderr') === -1) { return; }
+  process.stderr.write('stderr ' + message + '\n');
+}
+
+for (var i = 0; i < max; i++) {
+  stdout(i);
+  stderr(i);
+}
+
+exit(errorCode);
+
+stdout('fail');
+stderr('fail');