Add one-click installers for admin and user batch scripts

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

seediso/windows11/40-Install-Rustup.bat

@@ -20,7 +20,7 @@ echo Downloading rustup-init (%RUSTUP_ARCH%)...
 curl.exe -L --fail -o "%INSTALLER%" https://win.rustup.rs/%RUSTUP_ARCH%
 if errorlevel 1 (
     echo Download failed.
-    pause
+    if not defined INSTALL_ALL pause
     exit /b 1
 )
 
@@ -35,5 +35,5 @@ if "%RC%"=="0" (
 ) else (
     echo rustup-init exited with code %RC%.
 )
-pause
+if not defined INSTALL_ALL pause
 exit /b %RC%