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-api/node_modules/pg-connection-string/index.d.ts

@@ -0,0 +1,37 @@
+import { ClientConfig } from 'pg'
+
+export function parse(connectionString: string, options?: Options): ConnectionOptions
+
+export interface Options {
+  // Use libpq semantics when interpreting the connection string
+  useLibpqCompat?: boolean
+}
+
+interface SSLConfig {
+  ca?: string
+  cert?: string | null
+  key?: string
+  rejectUnauthorized?: boolean
+}
+
+export interface ConnectionOptions {
+  host: string | null
+  password?: string
+  user?: string
+  port?: string | null
+  database: string | null | undefined
+  client_encoding?: string
+  ssl?: boolean | string | SSLConfig
+  sslnegotiation?: 'postgres' | 'direct'
+
+  application_name?: string
+  fallback_application_name?: string
+  options?: string
+  keepalives?: number
+
+  // We allow any other options to be passed through
+  [key: string]: unknown
+}
+
+export function toClientConfig(config: ConnectionOptions): ClientConfig
+export function parseIntoClientConfig(connectionString: string): ClientConfig