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/node_modules/wkx/lib/binaryreader.js

@@ -0,0 +1,47 @@
+module.exports = BinaryReader;
+
+function BinaryReader(buffer, isBigEndian) {
+    this.buffer = buffer;
+    this.position = 0;
+    this.isBigEndian = isBigEndian || false;
+}
+
+function _read(readLE, readBE, size) {
+    return function () {
+        var value;
+
+        if (this.isBigEndian)
+            value = readBE.call(this.buffer, this.position);
+        else
+            value = readLE.call(this.buffer, this.position);
+
+        this.position += size;
+
+        return value;
+    };
+}
+
+BinaryReader.prototype.readUInt8 = _read(Buffer.prototype.readUInt8, Buffer.prototype.readUInt8, 1);
+BinaryReader.prototype.readUInt16 = _read(Buffer.prototype.readUInt16LE, Buffer.prototype.readUInt16BE, 2);
+BinaryReader.prototype.readUInt32 = _read(Buffer.prototype.readUInt32LE, Buffer.prototype.readUInt32BE, 4);
+BinaryReader.prototype.readInt8 = _read(Buffer.prototype.readInt8, Buffer.prototype.readInt8, 1);
+BinaryReader.prototype.readInt16 = _read(Buffer.prototype.readInt16LE, Buffer.prototype.readInt16BE, 2);
+BinaryReader.prototype.readInt32 = _read(Buffer.prototype.readInt32LE, Buffer.prototype.readInt32BE, 4);
+BinaryReader.prototype.readFloat = _read(Buffer.prototype.readFloatLE, Buffer.prototype.readFloatBE, 4);
+BinaryReader.prototype.readDouble = _read(Buffer.prototype.readDoubleLE, Buffer.prototype.readDoubleBE, 8);
+
+BinaryReader.prototype.readVarInt = function () {
+    var nextByte,
+        result = 0,
+        bytesRead = 0;
+
+    do {
+        nextByte = this.buffer[this.position + bytesRead];
+        result += (nextByte & 0x7F) << (7 * bytesRead);
+        bytesRead++;
+    } while (nextByte >= 0x80);
+
+    this.position += bytesRead;
+
+    return result;
+};