Add a script that installs ws2tcp-local from its latest release

The silent installer skips the desktop shortcut option, so the script
creates the shortcut itself.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

seediso/windows11/70-Install-ws2tcp-local-Admin.bat

@@ -0,0 +1,54 @@
+@echo off
+setlocal
+title Install ws2tcp-local
+
+fltmc >nul 2>&1
+if errorlevel 1 (
+    echo Please right-click this file and choose "Run as administrator".
+    pause
+    exit /b 1
+)
+
+set "MANIFEST=https://wangguofang.net/ws2tcp-local/releases/latest.json"
+set "INSTALLER=%TEMP%\ws2tcp-local-setup.exe"
+
+echo Looking up the latest ws2tcp-local release...
+set "URL="
+for /f "usebackq delims=" %%U in (`powershell -NoProfile -ExecutionPolicy Bypass -Command "(Invoke-RestMethod -UseBasicParsing '%MANIFEST%').windows_url"`) do set "URL=%%U"
+if not defined URL (
+    echo Could not read the download URL from %MANIFEST%.
+    pause
+    exit /b 1
+)
+
+echo Downloading %URL%...
+curl.exe -fL --retry 3 -o "%INSTALLER%" "%URL%"
+if errorlevel 1 (
+    echo Download failed.
+    pause
+    exit /b 1
+)
+
+echo Installing ws2tcp-local...
+"%INSTALLER%" /S
+set "RC=%ERRORLEVEL%"
+del "%INSTALLER%" >nul 2>&1
+
+if "%RC%"=="0" (
+    call :desktop_shortcut
+    echo Done.
+) else (
+    echo The installer exited with code %RC%.
+)
+pause
+exit /b %RC%
+
+:desktop_shortcut
+rem The silent installer skips its "Create desktop shortcut" option.
+set "EXE=%ProgramFiles%\ws2tcp-local\bin\ws2tcp-local-gui.exe"
+if not exist "%EXE%" (
+    echo Could not find %EXE%, skipping the desktop shortcut.
+    exit /b 0
+)
+powershell -NoProfile -ExecutionPolicy Bypass -Command "$s=(New-Object -ComObject WScript.Shell).CreateShortcut([Environment]::GetFolderPath('CommonDesktopDirectory')+'\ws2tcp-local.lnk'); $s.TargetPath=$env:EXE; $s.WorkingDirectory=Split-Path $env:EXE; $s.Save()"
+exit /b 0