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/view/widget/card_dialog.dart

@@ -0,0 +1,25 @@
+import 'package:flutter/material.dart';
+
+class CardDialog extends StatelessWidget {
+  const CardDialog(
+      {Key? key, this.title, this.content, this.actions, this.padding})
+      : super(key: key);
+
+  final Widget? content;
+  final List<Widget>? actions;
+  final Widget? title;
+  final EdgeInsets? padding;
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      contentPadding: padding ?? const EdgeInsets.fromLTRB(24, 17, 24, 7),
+      shape: const RoundedRectangleBorder(
+        borderRadius: BorderRadius.all(Radius.circular(20.0)),
+      ),
+      title: title,
+      content: content,
+      actions: actions,
+    );
+  }
+}