Fix: Handle null content in PlanResource::formatContent method

- Fix deprecated warning when passing null to str_replace() function\n- Use null coalescing operator to provide empty string as default value\n- Comply with PHP 8.2+ type requirements

app/Http/Controllers/V1/Client/ClientController.php

@@ -27,6 +27,7 @@ class ClientController extends Controller
         'vmess' => '[vmess]',
         'trojan' => '[trojan]',
         'tuic' => '[tuic]',
+        'socks' => '[socks]',
     ];
 
     // 支持hy2 的客户端版本列表

app/Http/Controllers/V1/Server/UniProxyController.php

@@ -147,6 +147,9 @@ class UniProxyController extends Controller
                 'zero_rtt_handshake' => false,
                 'heartbeat' => "3s",
             ],
+            'socks' => [
+                'server_port' => (int) $serverPort,
+            ],
             default => []
         };