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/pgpass/lib/index.js

@@ -0,0 +1,23 @@
+'use strict';
+
+var path = require('path')
+  , fs = require('fs')
+  , helper = require('./helper.js')
+;
+
+
+module.exports = function(connInfo, cb) {
+    var file = helper.getFileName();
+    
+    fs.stat(file, function(err, stat){
+        if (err || !helper.usePgPass(stat, file)) {
+            return cb(undefined);
+        }
+
+        var st = fs.createReadStream(file);
+
+        helper.getPassword(connInfo, st, cb);
+    });
+};
+
+module.exports.warnTo = helper.warnTo;