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/async/internal/awaitify.js

@@ -0,0 +1,28 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = awaitify;
+// conditionally promisify a function.
+// only return a promise if a callback is omitted
+function awaitify(asyncFn, arity) {
+    if (!arity) arity = asyncFn.length;
+    if (!arity) throw new Error('arity is undefined');
+    function awaitable(...args) {
+        if (typeof args[arity - 1] === 'function') {
+            return asyncFn.apply(this, args);
+        }
+
+        return new Promise((resolve, reject) => {
+            args[arity - 1] = (err, ...cbArgs) => {
+                if (err) return reject(err);
+                resolve(cbArgs.length > 1 ? cbArgs : cbArgs[0]);
+            };
+            asyncFn.apply(this, args);
+        });
+    }
+
+    return awaitable;
+}
+module.exports = exports.default;