Fix QR enrollment on hosted deployments, remove auto gallery-growth on high-confidence matches

QR self-enrollment, multi-photo attendance, reject-and-rematch reinforcement, and enrollment reliability fixes

Per-classroom rosters, self-enroll tab with guided camera recording, and three-tier attendance with teacher-reviewed reinforcement

Classroom Monitoring overhaul + Attendance UI updates (see SESSION_SUMMARY.md)

Switch attendance recognition backbone from glintr100 to AdaFace IR-101

Add Preview demo image button alongside Run demo button

PRISM AI — with demo attendance button