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/CompileServer.cs

@@ -0,0 +1,84 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Text;
+using System.Text.Encodings.Web;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+
+namespace Sim.Runner;
+
+/// <summary>
+/// 常驻编译服务：从标准输入读取 {"id":…,"dir":…}，编译该目录下的学生工程，
+/// 成功时把 StudentApp.dll / StudentApp.pdb 写到同一目录，回复 {"id":…,"type":"compiled",…}。
+/// 编译器常驻，第一次之后的编译不再有加载和预热开销。
+/// </summary>
+internal static class CompileServer
+{
+    public const string AssemblyFile = "StudentApp.dll";
+    public const string PdbFile = "StudentApp.pdb";
+
+    private static readonly JsonSerializerOptions JsonOptions = new() { Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping };
+
+    public static int Run()
+    {
+        using var input = new StreamReader(Console.OpenStandardInput(), new UTF8Encoding(false));
+        using var output = new StreamWriter(Console.OpenStandardOutput(), new UTF8Encoding(false)) { AutoFlush = true };
+
+        WarmUp();
+        output.WriteLine(new JsonObject { ["type"] = "ready" }.ToJsonString(JsonOptions));
+
+        while (input.ReadLine() is { } line)
+        {
+            JsonObject reply;
+            JsonNode? id = null;
+            try
+            {
+                var request = JsonNode.Parse(line)!.AsObject();
+                id = request["id"]?.DeepClone();
+                reply = Compile((string?)request["dir"] ?? throw new ArgumentException("缺少 dir"));
+            }
+            catch (Exception ex)
+            {
+                reply = new JsonObject { ["type"] = "compileFailed", ["message"] = ex.Message };
+            }
+            reply["id"] = id;
+            output.WriteLine(reply.ToJsonString(JsonOptions));
+        }
+        return 0;
+    }
+
+    private static JsonObject Compile(string dir)
+    {
+        var watch = Stopwatch.StartNew();
+        var result = StudentCompiler.Compile(dir);
+        if (result.Success)
+        {
+            File.WriteAllBytes(Path.Combine(dir, AssemblyFile), result.Assembly);
+            File.WriteAllBytes(Path.Combine(dir, PdbFile), result.Pdb);
+        }
+        return new JsonObject
+        {
+            ["type"] = "compiled",
+            ["ok"] = result.Success,
+            ["diagnostics"] = result.Diagnostics,
+            ["ms"] = watch.ElapsedMilliseconds,
+        };
+    }
+
+    /// <summary>启动时编译一个小程序，让 Roslyn 完成加载和 JIT，学生第一次点"运行"时就不用等</summary>
+    private static void WarmUp()
+    {
+        var dir = Directory.CreateTempSubdirectory("sim-warmup-");
+        try
+        {
+            File.WriteAllText(Path.Combine(dir.FullName, "Program.cs"),
+                "using System.Windows.Forms; static class P { static void Main() { var f = new Form(); f.Text = \"预热\"; } }");
+            StudentCompiler.Compile(dir.FullName);
+        }
+        finally
+        {
+            dir.Delete(recursive: true);
+        }
+    }
+}