AVT-WW-TP1-23-AXX500 (AX053B810HGD) reported device_type 'unknown' with
empty oneUiVersion, falling back to common caps. It's the same BESPOKE
Cube Air lineage as A-VTWW-TP2-21-COMMON (issue #151), just with the
'-WW-' delimiter shifted one letter left ('A-VTWW-' -> 'AVT-WW-'), which
splits into an 'AVT'/'WW' token pair the existing whole-token 'VTWW' entry
can't see. Added 'AVT' as its own board token onto the same air_purifier
registry -- the resource surface (wind/strength fan, HEPA filter, air
quality sensors, alarms) already matched with zero unbound hrefs once
routed there, so no new capabilities were needed.