fix：修复代理保存失败

lib/api/proxy.dart

@@ -102,7 +102,10 @@ setProxyDialog(context) {
                   spProxyIp, ipController.value.text.toString().trim());
               SpUtil.putString(
                   spProxyPort, portController.value.text.toString().trim());
+              // 延迟1s 退出，修复保存失败问题
+              Future.delayed(const Duration(seconds: 1), () {
                 exit(0);
+              });
             },
             child: Container(
               margin: const EdgeInsets.only(