Same sibling-container pattern as HA/ESPHome. The hand-written unit used
Privileged=true, which isn't a real Quadlet key — the generator silently
drops the whole file on an unsupported key, so frigate.service was never
generated (hence `systemctl enable frigate` saying the unit doesn't exist).
Fixed with PodmanArgs=--privileged.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
