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/validator/es/lib/isNumeric.js

@@ -0,0 +1,10 @@
+import assertString from './util/assertString';
+import { decimal } from './alpha';
+var numericNoSymbols = /^[0-9]+$/;
+export default function isNumeric(str, options) {
+  assertString(str);
+  if (options && options.no_symbols) {
+    return numericNoSymbols.test(str);
+  }
+  return new RegExp("^[+-]?([0-9]*[".concat((options || {}).locale ? decimal[options.locale] : '.', "])?[0-9]+$")).test(str);
+}