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

feat(labs): add instructor labs CRUD, grading, and attendance improvements for Flutter Phase 7

feat(labs): enhance instruction file retrieval with improved query strategies

feat(drive-integration): refactor Google Drive integration with folder service and DB schema improvements

Labs - Quizzes - Assignment student Dashboard still under work

feat(ta-dashboard): unlock live TA APIs on existing routes

try after off

Clean initial commit without secrets