The global enable_photo_verification toggle only fed the portal get_settings flag;
the actual writes ignored it — the NFC kiosk gated on nfc_photo_required and the
portal on location.require_photo, so photos were captured even with the toggle OFF.
Now it's the master: OFF => no photo captured/stored anywhere (NFC kiosk config +
tap, and portal check-in); ON => per-location / NFC settings apply. Test + help
text updated. Bump 3.16.0 -> 3.16.1.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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