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/logform/metadata.js

@@ -0,0 +1,61 @@
+'use strict';
+
+const format = require('./format');
+
+function fillExcept(info, fillExceptKeys, metadataKey) {
+  const savedKeys = fillExceptKeys.reduce((acc, key) => {
+    acc[key] = info[key];
+    delete info[key];
+    return acc;
+  }, {});
+  const metadata = Object.keys(info).reduce((acc, key) => {
+    acc[key] = info[key];
+    delete info[key];
+    return acc;
+  }, {});
+
+  Object.assign(info, savedKeys, {
+    [metadataKey]: metadata
+  });
+  return info;
+}
+
+function fillWith(info, fillWithKeys, metadataKey) {
+  info[metadataKey] = fillWithKeys.reduce((acc, key) => {
+    acc[key] = info[key];
+    delete info[key];
+    return acc;
+  }, {});
+  return info;
+}
+
+/**
+ * Adds in a "metadata" object to collect extraneous data, similar to the metadata
+ * object in winston 2.x.
+ */
+module.exports = format((info, opts = {}) => {
+  let metadataKey = 'metadata';
+  if (opts.key) {
+    metadataKey = opts.key;
+  }
+
+  let fillExceptKeys = [];
+  if (!opts.fillExcept && !opts.fillWith) {
+    fillExceptKeys.push('level');
+    fillExceptKeys.push('message');
+  }
+
+  if (opts.fillExcept) {
+    fillExceptKeys = opts.fillExcept;
+  }
+
+  if (fillExceptKeys.length > 0) {
+    return fillExcept(info, fillExceptKeys, metadataKey);
+  }
+
+  if (opts.fillWith) {
+    return fillWith(info, opts.fillWith, metadataKey);
+  }
+
+  return info;
+});