第 0 阶段：教材项目 2 任务 1 在网页中原样运行

- runtime：仿真 WinForms 子集（Form、Button、Label、TextBox、ComboBox、
  GroupBox、Timer、MessageBox、界面线程消息循环、跨线程检查）、
  教材设备类库（DeviceCtrlHelper、LED 控件）、运行器（常驻编译服务 + 运行模式）
- server：Bun + Hono，WebSocket 会话，每次运行一个进程，消息转发
- web：Vue + Naive UI，WinForms 风格窗体渲染、MessageBox、实训台 LED 屏
- 端到端测试与 100 个程序并发的压力测试
- 教材逐任务摘要（docs/教材摘要）

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

runtime/Sim.Runner/StudentProgramHost.cs

@@ -0,0 +1,117 @@
+using System;
+using System.Diagnostics;
+using System.Globalization;
+using System.IO;
+using System.Reflection;
+using System.Runtime.Loader;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using System.Threading;
+using System.Windows.Forms;
+using Sim.Host;
+
+namespace Sim.Runner;
+
+/// <summary>
+/// 运行一个已编译的学生程序：在模拟的界面线程上执行 Main，主线程从标准输入读取浏览器的操作。
+/// 这个类不能引用 Roslyn 的任何类型，否则运行模式也会加载编译器。
+/// </summary>
+internal static class StudentProgramHost
+{
+    public static int Run(string dir)
+    {
+        var processStart = Process.GetCurrentProcess().StartTime;
+        SimHost.Initialize(Console.OpenStandardOutput());
+        var console = new ConsoleForwarder();
+        Console.SetOut(console);
+        Console.SetIn(TextReader.Null); // 标准输入用于协议，学生的 Console.ReadLine 读不到内容
+
+        // 和中文 Windows 一致：DateTime.ToString() 等按 zh-CN 格式输出
+        var zhCN = CultureInfo.GetCultureInfo("zh-CN");
+        CultureInfo.DefaultThreadCurrentCulture = zhCN;
+        CultureInfo.DefaultThreadCurrentUICulture = zhCN;
+        CultureInfo.CurrentCulture = zhCN;
+        CultureInfo.CurrentUICulture = zhCN;
+
+        var assembly = AssemblyLoadContext.Default.LoadFromStream(
+            new MemoryStream(File.ReadAllBytes(Path.Combine(dir, CompileServer.AssemblyFile))),
+            new MemoryStream(File.ReadAllBytes(Path.Combine(dir, CompileServer.PdbFile))));
+        SimHost.StudentAssembly = assembly;
+        var entryPoint = assembly.EntryPoint;
+        if (entryPoint == null)
+        {
+            SimHost.Send(new JsonObject { ["type"] = "exception", ["message"] = "程序中找不到 Main 方法", ["detail"] = "" });
+            return 1;
+        }
+
+        AppDomain.CurrentDomain.UnhandledException += (_, e) =>
+        {
+            // 学生创建的后台线程抛出未处理异常时，和真实程序一样整个程序结束
+            if (e.ExceptionObject is Exception ex) SimHost.ReportException(ex);
+            console.Flush();
+        };
+
+        var uiThread = new Thread(() =>
+        {
+            SimHost.Ui.BindToCurrentThread();
+            SynchronizationContext.SetSynchronizationContext(new WindowsFormsSynchronizationContext());
+            SimHost.Send(new JsonObject { ["type"] = "started", ["ms"] = (long)(DateTime.Now - processStart).TotalMilliseconds });
+            try
+            {
+                var parameters = entryPoint.GetParameters().Length == 0 ? null : new object[] { Array.Empty<string>() };
+                entryPoint.Invoke(null, parameters);
+            }
+            catch (Exception ex)
+            {
+                SimHost.ReportException(ex);
+            }
+            finally
+            {
+                console.Flush();
+                SimHost.FlushChanges();
+                Environment.Exit(0);
+            }
+        }) { Name = "UI" };
+        uiThread.Start();
+
+        ReadActions();
+        // 服务器关闭了标准输入：结束运行
+        Environment.Exit(0);
+        return 0;
+    }
+
+    /// <summary>读取浏览器发来的操作，排队到界面线程执行</summary>
+    private static void ReadActions()
+    {
+        using var input = new StreamReader(Console.OpenStandardInput(), new UTF8Encoding(false));
+        while (input.ReadLine() is { } line)
+        {
+            JsonObject? message;
+            try
+            {
+                message = JsonNode.Parse(line) as JsonObject;
+            }
+            catch (JsonException)
+            {
+                continue;
+            }
+            switch ((string?)message?["type"])
+            {
+                case "action":
+                    if (SimHost.FindControl((string?)message!["id"] ?? "") is { } control)
+                    {
+                        var action = UserAction.FromJson(message);
+                        SimHost.Ui.Post(() => control.PerformUserAction(action));
+                    }
+                    break;
+                case "reply":
+                    SimHost.CompleteRequest((int?)message!["requestId"] ?? 0, message["result"]?.DeepClone());
+                    break;
+                case "stop":
+                    Environment.Exit(0);
+                    break;
+            }
+        }
+    }
+}