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-admin-v2/node_modules/expand-template/index.js

@@ -0,0 +1,26 @@
+module.exports = function (opts) {
+  var sep = opts ? opts.sep : '{}'
+  var len = sep.length
+
+  var whitespace = '\\s*'
+  var left = escape(sep.substring(0, len / 2)) + whitespace
+  var right = whitespace + escape(sep.substring(len / 2, len))
+
+  return function (template, values) {
+    Object.keys(values).forEach(function (key) {
+      var value = String(values[key]).replace(/\$/g, '$$$$')
+      template = template.replace(regExp(key), value)
+    })
+    return template
+  }
+
+  function escape (s) {
+    return [].map.call(s, function (char) {
+      return '\\' + char
+    }).join('')
+  }
+
+  function regExp (key) {
+    return new RegExp(left + key + right, 'g')
+  }
+}