支持添加删除服务器信息，以在服务器状态页显示CPU、内存等

lib/data/model/tcp_status.dart

@@ -0,0 +1,39 @@
+///
+/// Code generated by jsonToDartModel https://ashamp.github.io/jsonToDartModel/
+///
+class TcpStatus {
+/*
+{
+  "maxConn": 0,
+  "active": 1,
+  "passive": 2,
+  "fail": 3
+} 
+*/
+
+  int? maxConn;
+  int? active;
+  int? passive;
+  int? fail;
+
+  TcpStatus({
+    this.maxConn,
+    this.active,
+    this.passive,
+    this.fail,
+  });
+  TcpStatus.fromJson(Map<String, dynamic> json) {
+    maxConn = json["maxConn"]?.toInt();
+    active = json["active"]?.toInt();
+    passive = json["passive"]?.toInt();
+    fail = json["fail"]?.toInt();
+  }
+  Map<String, dynamic> toJson() {
+    final Map<String, dynamic> data = Map<String, dynamic>();
+    data["maxConn"] = maxConn;
+    data["active"] = active;
+    data["passive"] = passive;
+    data["fail"] = fail;
+    return data;
+  }
+}