Fix GPU visibility, update depth scale, and improve radar display timing

Add startup GPU diagnostics

Update default depth_scale to 100.0 in app.py

feat: fix depth inversion and add video overlays

feat: fix multi-gpu visibility and improve logging

feat(inference): enable full multi-GPU support for all models

added estimated/relative distance

added depth view

added depth everything v2

added apple depth pro

wired endpoints to new html

added async first frame/video detection

added drone detector

removed owlv2

inital commit