✨ feat(*): 更新 PLC 相关功能与配置

- 在 appConfig.json 中添加 EndianFormat 配置项并更新相关输入输出地址
- 修改 ResultCode 类型为 short，确保与 PLC 通信一致
- 新增 DesignTimePlcService 以支持设计时的 PLC 测试写入功能
- 更新 SystemSettingViewModel 和 DashboardPage 以支持手动测试写入
- 调整多个视图模型和服务以适应新的 PLC 写入逻辑
- 更新相关单元测试以验证新功能的正确性

tests/AxiOmron.PcbCheck.Tests/SystemSettingViewModelTests.cs

@@ -34,7 +34,7 @@ public sealed class SystemSettingViewModelTests
                 StatusMessage = "SFTP 连接成功，根目录可访问。"
             }
         };
-        var viewModel = new SystemSettingViewModel(configService, fileCheckService, stateStore, dispatcherService);
+        var viewModel = new SystemSettingViewModel(configService, fileCheckService, stateStore, dispatcherService, new FakePlcService());
 
         await viewModel.TestFileCheckConnectionCommand.ExecuteAsync(null);
 
@@ -60,7 +60,7 @@ public sealed class SystemSettingViewModelTests
                 StatusMessage = "SFTP 连接失败: timeout"
             }
         };
-        var viewModel = new SystemSettingViewModel(configService, fileCheckService, stateStore, dispatcherService);
+        var viewModel = new SystemSettingViewModel(configService, fileCheckService, stateStore, dispatcherService, new FakePlcService());
 
         await viewModel.TestFileCheckConnectionCommand.ExecuteAsync(null);
 
@@ -87,7 +87,7 @@ public sealed class SystemSettingViewModelTests
             });
         });
 
-        var viewModel = new SystemSettingViewModel(configService, new FakeFileCheckService(), stateStore, dispatcherService);
+        var viewModel = new SystemSettingViewModel(configService, new FakeFileCheckService(), stateStore, dispatcherService, new FakePlcService());
 
         Assert.Single(viewModel.PlcMonitorItems);
         Assert.Equal("PcbArrived", viewModel.PlcMonitorItems[0].Name);
@@ -104,7 +104,7 @@ public sealed class SystemSettingViewModelTests
             var configService = new FakeAppConfigService();
             var stateStore = new AppStateStore();
             var dispatcherService = new CapturedDispatcherService(Dispatcher.CurrentDispatcher);
-            var viewModel = new SystemSettingViewModel(configService, new FakeFileCheckService(), stateStore, dispatcherService);
+            var viewModel = new SystemSettingViewModel(configService, new FakeFileCheckService(), stateStore, dispatcherService, new FakePlcService());
             _ = CollectionViewSource.GetDefaultView(viewModel.PlcMonitorItems);
 
             Exception? capturedException = null;
@@ -160,7 +160,8 @@ public sealed class SystemSettingViewModelTests
             configService,
             new FakeFileCheckService(),
             stateStore,
-            new CanceledDispatcherService());
+            new CanceledDispatcherService(),
+            new FakePlcService());
         var synchronizationContext = new ExceptionCapturingSynchronizationContext();
         SynchronizationContext? originalContext = SynchronizationContext.Current;
 
@@ -296,6 +297,37 @@ public sealed class SystemSettingViewModelTests
         }
     }
 
+    /// <summary>
+    /// 提供系统设置页测试用 PLC 服务替身。
+    /// </summary>
+    private sealed class FakePlcService : IPlcService
+    {
+        public Task<PlcSignalSnapshot> ReadSignalsAsync(CancellationToken cancellationToken)
+        {
+            return Task.FromResult(new PlcSignalSnapshot());
+        }
+
+        public Task<PlcMonitorSnapshot> ReadMonitorSnapshotAsync(CancellationToken cancellationToken)
+        {
+            return Task.FromResult(new PlcMonitorSnapshot());
+        }
+
+        public Task WriteStateAsync(PlcProcessState state, CancellationToken cancellationToken)
+        {
+            return Task.CompletedTask;
+        }
+
+        public Task ForceReconnectAsync(CancellationToken cancellationToken)
+        {
+            return Task.CompletedTask;
+        }
+
+        public Task<PlcWriteResult> WriteRawValueAsync(string address, PlcWriteType type, string value, CancellationToken cancellationToken)
+        {
+            return Task.FromResult(PlcWriteResult.Success(address, type, value));
+        }
+    }
+
     /// <summary>
     /// 提供立即执行的测试用 Dispatcher，实现与设计时调度一致的同步行为。
     /// </summary>