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

node_modules/http-proxy-middleware/dist/handlers/fix-request-body.d.ts

@@ -0,0 +1,22 @@
+import type * as http from 'node:http';
+export type BodyParserLikeRequest = http.IncomingMessage & {
+    body?: any;
+};
+/**
+ * Fix proxied body if bodyParser is involved.
+ *
+ * @example
+ * ```ts
+ * createProxyMiddleware({
+ *   target: 'http://example.com',
+ *   on: {
+ *     proxyReq: fixRequestBody,
+ *   }
+ * });
+ * ```
+ *
+ * Alternative solution without using `fixRequestBody()`: put `http-proxy-middleware` before `bodyParser` in the middleware stack.
+ *
+ * @see {@link https://github.com/chimurai/http-proxy-middleware/issues/40 Github issue #40 - POST request body is not proxied}
+ */
+export declare function fixRequestBody<TReq extends BodyParserLikeRequest = BodyParserLikeRequest>(proxyReq: http.ClientRequest, req: TReq): void;