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-v2/node_modules/canvas/util/win_jpeg_lookup.js

@@ -0,0 +1,21 @@
+const fs = require('fs')
+const paths = ['C:/libjpeg-turbo']
+
+if (process.arch === 'x64') {
+  paths.unshift('C:/libjpeg-turbo64')
+}
+
+paths.forEach(function (path) {
+  if (exists(path)) {
+    process.stdout.write(path)
+    process.exit()
+  }
+})
+
+function exists (path) {
+  try {
+    return fs.lstatSync(path).isDirectory()
+  } catch (e) {
+    return false
+  }
+}