第一阶段迁移已完成。

已实现：
ASP.NET Core 10 分层解决方案：[Eis.slnx](C:/Users/BI/Documents/EIS-dotnet/Eis.slnx)
ASP.NET Core 统一入口与健康检查：[Program.cs](C:/Users/BI/Documents/EIS-dotnet/src/Eis.Web/Program.cs)
原前端静态资源无修改托管
未迁移 API 自动转发至旧 Node 服务，兼容 JSON、Cookie、请求体和文件下载
可重复执行的端到端测试：[smoke-dotnet-migration.ps1](C:/Users/BI/Documents/EIS-dotnet/scripts/smoke-dotnet-migration.ps1)
迁移进度与运行说明：[MIGRATION.md](C:/Users/BI/Documents/EIS-dotnet/MIGRATION.md)
验证结果：

src/Eis.Web/Program.cs

@@ -0,0 +1,70 @@
+using System.Net;
+using Eis.Infrastructure.Migration;
+using Eis.Web.Frontend;
+using Eis.Web.Legacy;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.WebHost.ConfigureKestrel(options => options.AddServerHeader = false);
+builder.Services.Configure<LegacyNodeOptions>(builder.Configuration.GetSection(LegacyNodeOptions.SectionName));
+builder.Services.AddHttpClient<LegacyApiProxy>((services, client) =>
+{
+    var options = services.GetRequiredService<Microsoft.Extensions.Options.IOptions<LegacyNodeOptions>>().Value;
+    client.BaseAddress = options.BaseUrl;
+    client.Timeout = TimeSpan.FromSeconds(30);
+    client.DefaultRequestHeaders.UserAgent.ParseAdd("Eis.AspNetCore.Migration/1.0");
+}).ConfigurePrimaryHttpMessageHandler(() => new SocketsHttpHandler
+{
+    AllowAutoRedirect = false,
+    AutomaticDecompression = DecompressionMethods.None,
+    UseCookies = false
+});
+builder.Services.AddProblemDetails();
+
+var app = builder.Build();
+
+app.UseExceptionHandler();
+app.Use(async (context, next) =>
+{
+    context.Response.Headers.XContentTypeOptions = "nosniff";
+    context.Response.Headers.XFrameOptions = "DENY";
+    context.Response.Headers["Referrer-Policy"] = "same-origin";
+    await next();
+});
+
+app.MapGet("/health/live", () => Results.Json(new
+{
+    status = "healthy",
+    service = "Eis.Web",
+    framework = ".NET 10"
+}));
+
+app.MapGet("/health/migration", async (LegacyApiProxy proxy, CancellationToken cancellationToken) =>
+{
+    var legacyAvailable = await proxy.IsAvailableAsync(cancellationToken);
+    var statusCode = legacyAvailable ? StatusCodes.Status200OK : StatusCodes.Status503ServiceUnavailable;
+    return Results.Json(new
+    {
+        status = legacyAvailable ? "healthy" : "degraded",
+        legacyApiAvailable = legacyAvailable,
+        features = MigrationFeatureCatalog.Current
+    }, statusCode: statusCode);
+});
+
+string[] methods =
+[
+    HttpMethods.Get,
+    HttpMethods.Head,
+    HttpMethods.Post,
+    HttpMethods.Put,
+    HttpMethods.Patch,
+    HttpMethods.Delete,
+    HttpMethods.Options
+];
+app.MapMethods("/api/{**path}", methods, (HttpContext context, LegacyApiProxy proxy) => proxy.ForwardAsync(context));
+
+app.MapFrontendAssets();
+
+app.Run();
+
+public partial class Program;