Each playlist gets a max_connections setting (default 1), editable in the
playlist modal without re-importing. Active viewings are tracked in the
shared db_iptv.viewings collection (also used by serverIPTV_2): devices
are counted from 'on'/'off' commands and their 10 s polling. When
starting a channel pushes a playlist above its limit, the web UI shows a
quota alert. The playlist list shows active/max connections.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
