init: DeepSeek Harness WebView2 桌面客户端

- dsh-app.cs: C#/WinForms/WebView2 主程序（托盘常驻、自动拉起后端、DPI 感知）
- app.manifest: PerMonitorV2 DPI 声明
- dsh.ico / logo-512.png: DeepSeek 官方鲸鱼图标
- README.md: 使用与构建文档

app/src/app.manifest

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+  <assemblyIdentity version="1.0.0.0" processorArchitecture="*" name="DeepSeekHarness.dsh-app" type="win32"/>
+  <description>DeepSeek Harness</description>
+  <dependency>
+    <dependentAssembly>
+      <assemblyIdentity type="win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0" processorArchitecture="*" publicKeyToken="6595b64144ccf1df" language="*"/>
+    </dependentAssembly>
+  </dependency>
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true/pm</dpiAware>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
+    </windowsSettings>
+  </application>
+</assembly>

app/src/dsh-app.cs

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+// DeepSeek Harness — WebView2 独立桌面客户端（托盘常驻版）
+// 编译: csc /target:winexe /nologo /win32manifest:app.manifest /win32icon:dsh.ico
+//       /out:dsh-app.exe /r:Microsoft.Web.WebView2.Core.dll /r:Microsoft.Web.WebView2.WinForms.dll dsh-app.cs
+using System;
+using System.Diagnostics;
+using System.Drawing;
+using System.IO;
+using System.Net.Sockets;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using Microsoft.Web.WebView2.Core;
+using Microsoft.Web.WebView2.WinForms;
+
+static class Program
+{
+    private const int Port = 3080;
+    private static readonly string WebUrl = "http://127.0.0.1:3080";
+
+    private static Process serviceProcess;   // 本应用拉起的 dsh 服务进程
+    private static bool startedByUs;         // 服务是否由本应用启动
+    private static NotifyIcon trayIcon;
+    private static Form mainForm;
+
+    [STAThread]
+    static void Main()
+    {
+        Application.EnableVisualStyles();
+        Application.SetCompatibleTextRenderingDefault(false);
+
+        // 确保 dsh 服务在运行（若端口未监听则后台拉起）
+        if (!IsPortOpen(Port))
+        {
+            StartDshService();
+        }
+
+        mainForm = new Form
+        {
+            Text = "DeepSeek Harness",
+            ClientSize = new Size(1440, 900),
+            StartPosition = FormStartPosition.CenterScreen,
+            MinimumSize = new Size(800, 600),
+        };
+
+        // 窗口标题栏/任务栏使用 DeepSeek 图标
+        try
+        {
+            mainForm.Icon = Icon.ExtractAssociatedIcon(Application.ExecutablePath);
+        }
+        catch { }
+
+        // 系统托盘常驻图标
+        trayIcon = new NotifyIcon();
+        trayIcon.Icon = mainForm.Icon;
+        trayIcon.Text = "DeepSeek Harness";
+        trayIcon.Visible = true;
+        trayIcon.DoubleClick += (s, e) => ShowMainWindow();
+        var menu = new ContextMenuStrip();
+        menu.Items.Add("打开 DeepSeek Harness", null, (s, e) => ShowMainWindow());
+        menu.Items.Add(new ToolStripSeparator());
+        menu.Items.Add("退出", null, (s, e) => ExitApp());
+        trayIcon.ContextMenuStrip = menu;
+
+        // 点 X：直接最小化到系统托盘继续后台运行；完全退出请用托盘右键菜单
+        mainForm.FormClosing += (s, e) =>
+        {
+            if (e.CloseReason != CloseReason.UserClosing) return;
+            e.Cancel = true;
+            mainForm.Hide();
+        };
+
+        var status = new Label
+        {
+            Dock = DockStyle.Fill,
+            TextAlign = ContentAlignment.MiddleCenter,
+            Font = new Font("Microsoft YaHei UI", 14),
+            Text = "正在启动 DeepSeek Harness 服务…",
+        };
+        mainForm.Controls.Add(status);
+
+        var web = new WebView2 { Dock = DockStyle.Fill };
+
+        mainForm.Shown += async (s, e) =>
+        {
+            // 等待服务就绪（最多 ~30 秒）
+            bool ready = false;
+            for (int i = 0; i < 60; i++)
+            {
+                await Task.Delay(500);
+                if (IsPortOpen(Port)) { ready = true; break; }
+            }
+            if (!ready)
+            {
+                status.Text = "无法连接 DeepSeek Harness 服务（端口 " + Port + "）。\n" +
+                              "请查看日志：" + Path.Combine(AppDir(), "web.log");
+                return;
+            }
+
+            mainForm.SuspendLayout();
+            mainForm.Controls.Remove(status);
+            mainForm.Controls.Add(web);
+            mainForm.ResumeLayout();
+
+            try
+            {
+                string userData = Path.Combine(
+                    Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+                    "DeepSeekHarness", "EBWebView");
+                var cp = new CoreWebView2CreationProperties();
+                cp.UserDataFolder = userData;
+                web.CreationProperties = cp;
+                await web.EnsureCoreWebView2Async();
+                web.Source = new Uri(WebUrl);
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show("WebView2 初始化失败：\n" + ex.Message, "DeepSeek Harness",
+                    MessageBoxButtons.OK, MessageBoxIcon.Error);
+            }
+        };
+
+        Application.Run(mainForm);
+    }
+
+    static string AppDir()
+    {
+        return Path.GetDirectoryName(Application.ExecutablePath);
+    }
+
+    static bool IsPortOpen(int port)
+    {
+        try
+        {
+            using (var client = new TcpClient())
+            {
+                var task = client.ConnectAsync("127.0.0.1", port);
+                return task.Wait(500) && client.Connected;
+            }
+        }
+        catch { return false; }
+    }
+
+    // 直接启动 node.exe 运行 dsh 入口（不经 cmd/批处理，避免弹出 CMD 窗口）
+    static void StartDshService()
+    {
+        string appDir = AppDir();
+        string logFile = Path.Combine(appDir, "web.log");
+        string npmDir = Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "npm");
+        string nodeExe = @"C:\Program Files\nodejs\node.exe";
+        string binJs = Path.Combine(npmDir, "node_modules", "@deepseek-ai", "dsh", "lib", "bin.js");
+        try
+        {
+            if (!File.Exists(nodeExe) || !File.Exists(binJs)) return;
+
+            var psi = new ProcessStartInfo(nodeExe)
+            {
+                UseShellExecute = false,
+                CreateNoWindow = true,
+                WindowStyle = ProcessWindowStyle.Hidden,
+                RedirectStandardOutput = true,
+                RedirectStandardError = true,
+            };
+            psi.Arguments = "\"" + binJs + "\" web";
+
+            // 确保 node 与 npm 命令可用（dsh 插件可能用到）
+            string path = psi.EnvironmentVariables["PATH"] ?? "";
+            if (path.IndexOf("nodejs", StringComparison.OrdinalIgnoreCase) < 0)
+                path = @"C:\Program Files\nodejs;" + path;
+            if (path.IndexOf("npm", StringComparison.OrdinalIgnoreCase) < 0)
+                path = npmDir + ";" + path;
+            psi.EnvironmentVariables["PATH"] = path;
+
+            serviceProcess = Process.Start(psi);
+            startedByUs = true;
+
+            // 输出写日志文件（防管道缓冲死锁）
+            serviceProcess.OutputDataReceived += (s, e) =>
+            {
+                if (e.Data != null) { try { File.AppendAllText(logFile, e.Data + "\r\n"); } catch { } }
+            };
+            serviceProcess.ErrorDataReceived += (s, e) =>
+            {
+                if (e.Data != null) { try { File.AppendAllText(logFile, e.Data + "\r\n"); } catch { } }
+            };
+            serviceProcess.BeginOutputReadLine();
+            serviceProcess.BeginErrorReadLine();
+        }
+        catch (Exception ex)
+        {
+            try { File.WriteAllText(Path.Combine(AppDir(), "start-error.log"), ex.ToString()); } catch { }
+        }
+    }
+
+    static void ShowMainWindow()
+    {
+        if (mainForm == null) return;
+        mainForm.Show();
+        if (mainForm.WindowState == FormWindowState.Minimized)
+            mainForm.WindowState = FormWindowState.Normal;
+        mainForm.Activate();
+    }
+
+    // 完全退出：关闭后端服务 + 托盘 + 应用
+    static void ExitApp()
+    {
+        try
+        {
+            if (startedByUs && serviceProcess != null && !serviceProcess.HasExited)
+            {
+                serviceProcess.Kill();
+            }
+        }
+        catch { }
+        if (trayIcon != null)
+        {
+            trayIcon.Visible = false;
+            trayIcon.Dispose();
+            trayIcon = null;
+        }
+        Application.Exit();
+    }
+}