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/prebuild-install/error.js

@@ -0,0 +1,14 @@
+exports.noPrebuilts = function (opts) {
+  return new Error([
+    'No prebuilt binaries found',
+    '(target=' + opts.target,
+    'runtime=' + opts.runtime,
+    'arch=' + opts.arch,
+    'libc=' + opts.libc,
+    'platform=' + opts.platform + ')'
+  ].join(' '))
+}
+
+exports.invalidArchive = function () {
+  return new Error('Missing .node file in archive')
+}