chore: initial project import

backend/src/Monitor.Backend/BackendHost.cs

@@ -0,0 +1,55 @@
+using Fleet.Server;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using Monitor.Backend.Api;
+using Monitor.Backend.Application;
+using Monitor.Backend.Gateway;
+using Monitor.Backend.Storage.Sqlite;
+
+namespace Monitor.Backend;
+
+/// <summary>
+/// 组合根：在这里显式注册所有层。配置来自 <c>appsettings.json</c>、环境变量（<c>Monitor__DataDirectory</c> 等）和命令行。
+/// 测试用 <see cref="Build"/> 在真实端口上启动整个后端。
+/// </summary>
+public static class BackendHost
+{
+    public const string ConfigurationSection = "Monitor";
+    public const int MaxRequestBodyBytes = 64 * 1024;
+
+    public static WebApplication Build(string[] args, Action<BackendOptions>? configureOptions = null, TimeProvider? time = null)
+    {
+        WebApplicationBuilder builder = WebApplication.CreateSlimBuilder(args);
+
+        var options = new BackendOptions();
+        builder.Configuration.GetSection(ConfigurationSection).Bind(options);
+        configureOptions?.Invoke(options);
+
+        builder.WebHost.ConfigureKestrel(kestrel => kestrel.Limits.MaxRequestBodySize = MaxRequestBodyBytes);
+        builder.Logging.AddSimpleConsole(console =>
+        {
+            console.SingleLine = true;
+            console.UseUtcTimestamp = true;
+            console.TimestampFormat = "yyyy-MM-ddTHH:mm:ss.fffZ ";
+        });
+
+        IServiceCollection services = builder.Services;
+        services.AddSingleton(time ?? TimeProvider.System);
+        services.AddMonitorSqlite(options.DataDirectory);
+        services.AddMonitorApplication(options);
+        services.AddMonitorGateway();
+        services.AddMonitorApi();
+
+        WebApplication app = builder.Build();
+        // 静默死亡的 Agent（断电、断网）不会关闭连接：15 秒一个 Ping，20 秒没有 Pong 就关闭，这样面板上的在线状态才可信
+        app.UseWebSockets(new WebSocketOptions { KeepAliveInterval = TimeSpan.FromSeconds(15), KeepAliveTimeout = TimeSpan.FromSeconds(20) });
+        app.UseMonitorCors(options.CorsOrigins);
+        app.UseMonitorApi();
+        app.MapMonitorApi();
+        app.MapFleetEnrollment("/api/agent/v1/enroll");
+        app.MapFleetLink("/api/agent/v1/rpc");
+        return app;
+    }
+}

backend/src/Monitor.Backend/Monitor.Backend.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <AssemblyName>monitor-backend</AssemblyName>
+    <RootNamespace>Monitor.Backend</RootNamespace>
+    <IsAotCompatible>true</IsAotCompatible>
+    <EnableRequestDelegateGenerator>true</EnableRequestDelegateGenerator>
+    <EnableConfigurationBindingGenerator>true</EnableConfigurationBindingGenerator>
+    <OpenApiGenerateDocuments>true</OpenApiGenerateDocuments>
+    <OpenApiDocumentsDirectory>$(MSBuildProjectDirectory)/../../openapi</OpenApiDocumentsDirectory>
+    <OpenApiGenerateDocumentsOptions>--document-name v1 --file-name v1</OpenApiGenerateDocumentsOptions>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.ApiDescription.Server" PrivateAssets="all" />
+    <ProjectReference Include="..\Monitor.Backend.Api\Monitor.Backend.Api.csproj" />
+    <ProjectReference Include="..\Monitor.Backend.Gateway\Monitor.Backend.Gateway.csproj" />
+    <ProjectReference Include="..\Monitor.Backend.Storage.Sqlite\Monitor.Backend.Storage.Sqlite.csproj" />
+  </ItemGroup>
+</Project>

backend/src/Monitor.Backend/Program.cs

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+using Monitor.Backend;
+
+await BackendHost.Build(args).RunAsync();