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/disk_info.dart

@@ -0,0 +1,46 @@
+class DiskInfo {
+/*
+{
+  "mountPath": "",
+  "mountLocation": "",
+  "usedPercent": 0,
+  "used": "",=
+  "size": "",
+  "avail": ""
+} 
+*/
+
+  String? mountPath;
+  String? mountLocation;
+  double? usedPercent;
+  String? used;
+  String? size;
+  String? avail;
+
+  DiskInfo({
+    this.mountPath,
+    this.mountLocation,
+    this.usedPercent,
+    this.used,
+    this.size,
+    this.avail,
+  });
+  DiskInfo.fromJson(Map<String, dynamic> json) {
+    mountPath = json["mountPath"]?.toString();
+    mountLocation = json["mountLocation"]?.toString();
+    usedPercent = double.parse(json["usedPercent"]);
+    used = json["used"]?.toString();
+    size = json["size"]?.toString();
+    avail = json["avail"]?.toString();
+  }
+  Map<String, dynamic> toJson() {
+    final Map<String, dynamic> data = <String, dynamic>{};
+    data["mountPath"] = mountPath;
+    data["mountLocation"] = mountLocation;
+    data["usedPercent"] = usedPercent;
+    data["used"] = used;
+    data["size"] = size;
+    data["avail"] = avail;
+    return data;
+  }
+}