fix(qr): Use raw VLESS URI in last_config->config

Instead of generating a JSON config for X-Ray, pass the raw VLESS URI string
wrapped in a JSON object  inside .
This matches the behavior of WireGuard config handling in the master branch
and is likely the expected format for Amnezia Android X-Ray import.

inc/VpnClient.php

@@ -960,7 +960,7 @@ class VpnClient
                     }
 
                     // Use QrUtil to encode correct X-Ray payload
-                    $payloadXray = QrUtil::encodeXrayPayload($host, $port, $clientId, $fragment, $reality);
+                    $payloadXray = QrUtil::encodeXrayPayload($host, $port, $clientId, $fragment, $reality, $config);
                     return QrUtil::pngBase64($payloadXray);
                 }
             }