feat(notifications): add Firebase push delivery for Android

feat(assessment): implement Question Bank and Exam Generator backend

feat: implement question bank and exam modules with associated services, controllers, and entities

feat: implement core backend modules, notification system, and AI agent skill documentation

feat(progress): track student material views and persist course completion updates.

Issue #15 #17 #24 #26 Fixed

feat(attendance): face references, AI section flow, and nullable photo file

Scheduling templates done

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