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/bull/lib/scripts/takeLock-1.js

@@ -0,0 +1,21 @@
+'use strict';
+const content = `--[[
+  Takes a lock
+     Input:
+        KEYS[1] 'lock',
+        ARGV[1]  token
+        ARGV[2]  lock duration in milliseconds
+      Output:
+        "OK" if lock taken successfully.
+]]
+if redis.call("SET", KEYS[1], ARGV[1], "NX", "PX", ARGV[2]) then
+  return 1
+else
+  return 0
+end
+`;
+module.exports = {
+  name: 'takeLock',
+  content,
+  keys: 1,
+};