feature: let an empty server hibernate and still take a match

[lukepolo]

• a hibernating server stops ticking, so the panel ping stopped and a newly assigned match sat unapplied until somebody connected
• the ping now runs off world updates, which continue through hibernation
• match setup that has to finish before anyone connects is queued on the next world update whenever the server is not ticking; while it is ticking it takes the next tick exactly as before
• once a server has a match it turns sv_hibernate_when_empty off and stays awake until that match is gone, so timers and the end-of-map work never stall on an empty server
• both runtimes: Swiftly detects "not ticking" from OnTick going quiet, CounterStrikeSharp from OnServerHibernationUpdate
• ranked.server.cfg still sets sv_hibernate_when_empty 0; a server opts in with HIBERNATE_WHEN_EMPTY=true, which both images' setup.sh now honour and the dev manifests set