docs: translate Smart App Control section to English

The README body is English; the section added in the Smart App Control fix
was Polish. Also documents two verified details: pip.exe is unsigned (so
install via python -m pip), and py.exe carries the same PSF signature as
python.exe (so py -3 -m works when python is not on PATH).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>