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/core/extension/stringx.dart

@@ -0,0 +1,3 @@
+extension StringX on String {
+  int get i => int.parse(this);
+}

lib/core/utils.dart

@@ -1,6 +1,8 @@
 import 'dart:async';
 
 import 'package:flutter/material.dart';
+import 'package:toolbox/core/persistant_store.dart';
+import 'package:toolbox/view/widget/card_dialog.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 void unawaited(Future<void> future) {}
@@ -24,19 +26,44 @@ void showSnackBarWithAction(
 
 Future<bool> openUrl(String url) async {
   print('openUrl $url');
-
   if (!await canLaunch(url)) {
     print('canLaunch false');
     return false;
   }
-
   final ok = await launch(url, forceSafariVC: false);
-
   if (ok == true) {
     return true;
   }
-
   print('launch $url failed');
-
   return false;
 }
+
+Future<T?>? showRoundDialog<T>(
+    BuildContext context, String title, Widget child, List<Widget> actions,
+    {EdgeInsets? padding}) {
+  return showDialog<T>(
+      context: context,
+      builder: (ctx) {
+        return CardDialog(
+          title: Text(title),
+          content: child,
+          actions: actions,
+          padding: padding,
+        );
+      });
+}
+
+Widget buildSwitch(BuildContext context, StoreProperty<bool> prop,
+    {Function(bool)? func}) {
+  return ValueListenableBuilder(
+    valueListenable: prop.listenable(),
+    builder: (context, bool value, widget) {
+      return Switch(
+          value: value,
+          onChanged: (value) {
+            if (func != null) func(value);
+            prop.put(value);
+          });
+    },
+  );
+}