Adds first-run language prompt + persistent config.ini with bilingual
inline comments. Update check now returns just the tag; app.py renders
it as a clickable [link=...] in the header (matches dhcpsrv/netswitch
pattern). Strips all 'made by engelgardt' lines.
- new dev/src/vrcx/i18n.py (RU/EN translation table)
- new dev/src/vrcx/config.py (config.ini next to the exe)
- update_check.py: returns tag, no console writes
- app.py: load config, set lang, render clickable header, use config
defaults for BMC/SDS user and parallel_hosts; pass cfg.ping_sweep to
discover_sds_ip
- ui.py: all visible strings via t()
- README.md / README.ru.md: rewritten under the vrcx name and brief
