✨ feat: 初始化 PCB 检测 WPF 应用程序

* 创建 AxiOmron.PcbCheck 项目主框架及解决方案
* 添加 Dashboard 和系统设置页面
* 实现 Modbus TCP PLC、扫码枪、SFTP 查询等核心服务
* 集成 Andon 报警、工作流托管服务与日志配置
* 补充项目文档和 UI 设计规范

src/AxiOmron.PcbCheck/DesignTime/DesignTimeAppConfigService.cs

@@ -0,0 +1,120 @@
+using AxiOmron.PcbCheck.Options;
+using AxiOmron.PcbCheck.Services.Interfaces;
+
+namespace AxiOmron.PcbCheck.DesignTime;
+
+/// <summary>
+/// 提供设计时配置服务，返回固定的示例配置数据。
+/// </summary>
+public sealed class DesignTimeAppConfigService : IAppConfigService
+{
+    private readonly AppConfig _config;
+
+    /// <summary>
+    /// 初始化设计时配置服务。
+    /// </summary>
+    public DesignTimeAppConfigService()
+    {
+        _config = CreateSampleConfig();
+    }
+
+    /// <summary>
+    /// 读取设计时配置副本。
+    /// </summary>
+    /// <returns>示例根配置对象。</returns>
+    public AppConfig Load()
+    {
+        return CreateSampleConfig();
+    }
+
+    /// <summary>
+    /// 保存设计时配置，占位实现，仅更新内存中的副本。
+    /// </summary>
+    /// <param name="config">待保存的配置对象。</param>
+    /// <exception cref="ArgumentNullException">当 <paramref name="config"/> 为 <see langword="null"/> 时抛出。</exception>
+    public void Save(AppConfig config)
+    {
+        ArgumentNullException.ThrowIfNull(config);
+        _config.Plc = config.Plc;
+        _config.Scanner = config.Scanner;
+        _config.Sftp = config.Sftp;
+        _config.Andon = config.Andon;
+        _config.Workflow = config.Workflow;
+    }
+
+    /// <summary>
+    /// 获取设计时展示用的示例配置路径。
+    /// </summary>
+    /// <returns>固定的设计时配置路径文本。</returns>
+    public string GetConfigPath()
+    {
+        return @"D:\DesignTime\appConfig.Development.json";
+    }
+
+    /// <summary>
+    /// 创建设计器使用的示例配置对象。
+    /// </summary>
+    /// <returns>填充默认值后的配置对象。</returns>
+    private static AppConfig CreateSampleConfig()
+    {
+        return new AppConfig
+        {
+            Plc = new PlcOptions
+            {
+                Host = "192.168.10.25",
+                Port = 502,
+                UnitId = 1,
+                PollIntervalMs = 200,
+                ConnectTimeoutMs = 3000,
+                HeartbeatIntervalMs = 500,
+                ReleasePulseMs = 450,
+                ReleaseAckTimeoutMs = 2500
+            },
+            Scanner = new ScannerOptions
+            {
+                PortName = "COM3",
+                BaudRate = 9600,
+                DataBits = 8,
+                Parity = "None",
+                StopBits = "One",
+                ReadTimeoutMs = 2500,
+                TriggerCommand = "SCAN\\r",
+                ResponseTerminator = "\\r",
+                MaxScanAttempts = 3
+            },
+            Sftp = new SftpOptions
+            {
+                Host = "10.10.20.35",
+                Port = 22,
+                Username = "pcb_user",
+                Password = "******",
+                PrivateKeyPath = @"C:\Keys\pcb-check.ppk",
+                RootPath = "/data/pcb",
+                FileNamePattern = "${barcode}.txt",
+                RetryIntervalSeconds = 2,
+                MaxRetryCount = 3,
+                ConnectTimeoutMs = 3000
+            },
+            Andon = new AndonOptions
+            {
+                Enable = true,
+                Url = "http://10.10.20.50/api/andon/alarm",
+                Method = "POST",
+                TimeoutMs = 3000,
+                StationCode = "OMRON-L01",
+                StationName = "欧姆龙 PCB 检测",
+                EnableScanFailAlarm = true,
+                EnableFileNotFoundAlarm = true
+            },
+            Workflow = new WorkflowOptions
+            {
+                RequirePlcReady = true,
+                RequireAutoMode = true,
+                RequireStationEnable = true,
+                RequireManualResetAfterFault = true,
+                MaxUiLogEntries = 200,
+                MaxBoardRecords = 100
+            }
+        };
+    }
+}