One tap connects hub + camera. On a laptop, show the QR and scan with your phone.
Laptop: gy serve → open quick QR (/qr.html or /api/lan/qr)
and scan. Quick connect = hub + camera, then hold Cast.
Cast target: ?seat=200-R5-C12 · ?px=8000&py=4000 (any 16K LED) ·
?target=stage:… · bulk on sphere.html.
Streams vburst-frame + gyst with addressable pos.