feat: Windows 应用管理卸载支持

- uninstall.vbs：静默卸载（杀进程、清自启项、删快捷方式、删目录、删注册项）
- register-uninstall.ps1：注册 HKCU Uninstall 项（设置->应用 可卸载）

register-uninstall.ps1

@@ -0,0 +1,23 @@
+# Register DeepSeek Harness in Windows Apps & Features (uninstall entry)
+# DisplayName built via [char] codes to avoid file-encoding issues
+$ErrorActionPreference = 'Stop'
+$key = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Uninstall\DeepSeekHarness'
+$install = "$env:LOCALAPPDATA\DeepSeekHarness"
+$uninst = "$install\uninstall.vbs"
+
+if (-not (Test-Path $uninst)) { Write-Output "MISSING uninstall.vbs at $uninst"; exit 1 }
+
+# 'DeepSeek Harness ' + 桌面客户端 (U+684C U+9762 U+5BA2 U+6237 U+7AEF)
+$name = 'DeepSeek Harness ' + [char]0x684C + [char]0x9762 + [char]0x5BA2 + [char]0x6237 + [char]0x7AEF
+
+New-Item -Path $key -Force | Out-Null
+Set-ItemProperty -Path $key -Name 'DisplayName'    -Value $name -Type String
+Set-ItemProperty -Path $key -Name 'DisplayVersion' -Value '1.0.0' -Type String
+Set-ItemProperty -Path $key -Name 'Publisher'      -Value 'VanuSystems' -Type String
+Set-ItemProperty -Path $key -Name 'InstallLocation' -Value $install -Type String
+Set-ItemProperty -Path $key -Name 'DisplayIcon'    -Value "$install\dsh.ico" -Type String
+Set-ItemProperty -Path $key -Name 'UninstallString' -Value ('"' + "$env:SystemRoot\System32\wscript.exe" + '" "' + $uninst + '"') -Type String
+Set-ItemProperty -Path $key -Name 'NoModify'       -Value 1 -Type DWord
+Set-ItemProperty -Path $key -Name 'NoRepair'       -Value 1 -Type DWord
+Set-ItemProperty -Path $key -Name 'EstimatedSize'  -Value 343000 -Type DWord
+Write-Output 'Registered OK'