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

quixzoom-landing-fixed/about.html

@@ -5,7 +5,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>About quiXzoom — Global Field Intelligence Network</title>
   <meta name="description" content="quiXzoom is a global field intelligence network. Learn about our mission, team, and how we're building the world's largest observation network.">
-  <link rel="canonical" href="https://www.quixzoom.com/about.html">
+  <link rel="canonical" href="https://www.quixzoom.com/about">
   <style>
     :root {
       --bg-dark: #f5f5f7;
@@ -57,7 +57,7 @@
     .card {
       background: var(--surface);
       border: 1px solid var(--border);
-      border-radius: 16px;
+      border-radius: var(--radius-lg);
       padding: 32px;
     }
     .card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 12px; }