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/ioredis/built/SubscriptionSet.js

@@ -0,0 +1,41 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+/**
+ * Tiny class to simplify dealing with subscription set
+ */
+class SubscriptionSet {
+    constructor() {
+        this.set = {
+            subscribe: {},
+            psubscribe: {},
+            ssubscribe: {},
+        };
+    }
+    add(set, channel) {
+        this.set[mapSet(set)][channel] = true;
+    }
+    del(set, channel) {
+        delete this.set[mapSet(set)][channel];
+    }
+    channels(set) {
+        return Object.keys(this.set[mapSet(set)]);
+    }
+    isEmpty() {
+        return (this.channels("subscribe").length === 0 &&
+            this.channels("psubscribe").length === 0 &&
+            this.channels("ssubscribe").length === 0);
+    }
+}
+exports.default = SubscriptionSet;
+function mapSet(set) {
+    if (set === "unsubscribe") {
+        return "subscribe";
+    }
+    if (set === "punsubscribe") {
+        return "psubscribe";
+    }
+    if (set === "sunsubscribe") {
+        return "ssubscribe";
+    }
+    return set;
+}