新增MES模块，包含供应商、客户、车辆和地磅数据记录管理功能，支持免密接口和数据同步。更新相关控制器、实体、服务和数据库配置，优化权限管理和数据字典支持，确保系统的灵活性和可扩展性。

yy-admin-master/YY.Admin/ViewModels/MainWindowViewModel.cs

@@ -12,6 +12,7 @@ using System.Windows.Threading;
 using YY.Admin.Core;
 using YY.Admin.Core.Const;
 using YY.Admin.Core.Model;
+using YY.Admin.Core.Services;
 using YY.Admin.Core.Session;
 using YY.Admin.Core.Util;
 using YY.Admin.Event;
@@ -20,6 +21,7 @@ using YY.Admin.Services.Service.Auth;
 using YY.Admin.Services.Service.Jeecg;
 using YY.Admin.Services.Service.Menu;
 using YY.Admin.ViewModels.Control;
+using YY.Admin.Helper;
 
 namespace YY.Admin.ViewModels
 {
@@ -220,8 +222,9 @@ namespace YY.Admin.ViewModels
             _refreshTabToken = _eventAggregator.GetEvent<TabRefreshEvent>().Subscribe(OnRefreshTab);
             _loginOutToken = _eventAggregator.GetEvent<SysUserEvents.LoginOutEvent>().Subscribe(Destroy);
 
-            // Jeecg 用户增量同步：定时 + 可选 WebSocket（工控机断网续传）
-            _jeecgUserSyncCoordinator.Start();
+            // 首次按默认连接；后续按本地保存状态恢复
+            var settings = ServerSettingsStore.Load();
+            IsServerConnectionEnabled = !settings.DisconnectConnection;
 
             // 主窗口底部连接状态圆点
             _ = StartBackendConnectivityLoopAsync(_backendConnectivityCts.Token);
@@ -251,6 +254,30 @@ namespace YY.Admin.ViewModels
 
         public Brush BackendConnectionStatusBrush => IsBackendConnected ? Brushes.LimeGreen : Brushes.Red;
 
+        private bool _isServerConnectionEnabled = true;
+        /// <summary>
+        /// 是否启用服务器连接（默认启用）
+        /// </summary>
+        public bool IsServerConnectionEnabled
+        {
+            get => _isServerConnectionEnabled;
+            set
+            {
+                if (SetProperty(ref _isServerConnectionEnabled, value))
+                {
+                    if (!value)
+                    {
+                        IsBackendConnected = false;
+                        _jeecgUserSyncCoordinator.Stop();
+                    }
+                    else
+                    {
+                        _jeecgUserSyncCoordinator.Start();
+                    }
+                }
+            }
+        }
+
         public DelegateCommand LogoutCommand { get; }
 
         private void InitNavItems()
@@ -355,7 +382,8 @@ namespace YY.Admin.ViewModels
                             }
                             else
                             {
-                                _logger.Error($"导航失败: {viewName}");
+                                var exMsg = result.Exception?.Message;
+                                _logger.Error($"导航失败: {viewName}, Region={regionName}, Exception={exMsg}");
                                 tcs.SetResult(false);
                             }
                         }, parameters);
@@ -586,6 +614,26 @@ namespace YY.Admin.ViewModels
             while (!cancellationToken.IsCancellationRequested)
             {
                 bool connected = false;
+                if (!IsServerConnectionEnabled)
+                {
+                    try
+                    {
+                        await Application.Current.Dispatcher.InvokeAsync(() => { IsBackendConnected = false; });
+                    }
+                    catch
+                    {
+                    }
+
+                    try
+                    {
+                        await Task.Delay(TimeSpan.FromSeconds(ConnectivityCheckIntervalSeconds), cancellationToken);
+                    }
+                    catch (OperationCanceledException)
+                    {
+                        break;
+                    }
+                    continue;
+                }
                 try
                 {
                     // 每轮都重新读取配置，保存服务器设置后可即时生效
@@ -631,7 +679,24 @@ namespace YY.Admin.ViewModels
 
         private void OpenServerSettings()
         {
-            _dialogService.ShowDialog("ServerSettingsDialog", r => { });
+            _dialogService.ShowDialog("ServerSettingsDialog", r =>
+            {
+                if (r.Result == ButtonResult.OK)
+                {
+                    var settings = ServerSettingsStore.Load();
+                    IsServerConnectionEnabled = !settings.DisconnectConnection;
+                    if (settings.DisconnectConnection)
+                    {
+                        var signalService = _container.Resolve<ISignalRService>();
+                        _ = signalService.DisconnectAsync();
+                    }
+                    else
+                    {
+                        var signalService = _container.Resolve<ISignalRService>();
+                        _ = signalService.ConnectUnifiedDeviceChannelAsync(CancellationToken.None);
+                    }
+                }
+            });
         }
 
         /// <summary>