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/undici/lib/util/stats.js

@@ -0,0 +1,32 @@
+'use strict'
+
+const {
+  kConnected,
+  kPending,
+  kRunning,
+  kSize,
+  kFree,
+  kQueued
+} = require('../core/symbols')
+
+class ClientStats {
+  constructor (client) {
+    this.connected = client[kConnected]
+    this.pending = client[kPending]
+    this.running = client[kRunning]
+    this.size = client[kSize]
+  }
+}
+
+class PoolStats {
+  constructor (pool) {
+    this.connected = pool[kConnected]
+    this.free = pool[kFree]
+    this.pending = pool[kPending]
+    this.queued = pool[kQueued]
+    this.running = pool[kRunning]
+    this.size = pool[kSize]
+  }
+}
+
+module.exports = { ClientStats, PoolStats }