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/express-validator/lib/context-items/sanitization.d.ts

@@ -0,0 +1,12 @@
+import { Context } from '../context';
+import { CustomSanitizer, Meta, StandardSanitizer } from '../base';
+import { toString as toStringImpl } from '../utils';
+import { ContextItem } from './context-item';
+export declare class Sanitization implements ContextItem {
+    private readonly sanitizer;
+    private readonly custom;
+    private readonly options;
+    private readonly stringify;
+    constructor(sanitizer: StandardSanitizer | CustomSanitizer, custom: boolean, options?: any[], stringify?: typeof toStringImpl);
+    run(context: Context, value: any, meta: Meta): Promise<void>;
+}