Both Windows restart paths (api/updates._schedule_restart Update-button + bootstrap.py
supervisor auto-restart) now prefer pythonw.exe over python.exe and add CREATE_NO_WINDOW
to the Popen creationflags, so a restart no longer flashes an empty console window. Both
edits are inside sys.platform=='win32' guards (zero Linux/macOS change); bootstrap resolves
the win32-only flags via getattr(subprocess, attr, 0). Added regression test (RED on master,
GREEN here). Code byte-faithful from PR head 6d46e630e377.
Co-authored-by: nesquena-hermes <agent@nesquena-hermes>
Co-authored-by: perejaslav <perejaslav@users.noreply.github.com>
