feat: suppress WireGuard GUI auto-launch after MSI installation on Windows

Add DO_NOT_LAUNCH=1 argument to msiexec command to prevent WireGuard application from automatically starting after runtime installation completes.

desktop-client/tunnel-helper/src/main.rs

@@ -381,6 +381,7 @@ fn install_windows_runtime_direct() -> Result<(), String> {
         .arg(&installer)
         .arg("/qn")
         .arg("/norestart")
+        .arg("DO_NOT_LAUNCH=1")
         .creation_flags(CREATE_NO_WINDOW)
         .status()
         .map_err(|err| format!("Unable to launch bundled WireGuard MSI: {err}"))?;