feat: complete exam lifecycle — AI generation, submission, student session, and results
- Backend: AI generation fallbacks when OpenAI not configured, full exam
submission saving all params (difficulty, rubric, entity, grading system,
approval workflow) and creating linked question records per section
- Backend: new exam session controller with get_session, autosave, submit,
status, and results endpoints; student attempt/answer/score models
- Backend: new controllers for entities, approval workflows, exam schedules
- Frontend: exam session split-layout with passage panel, question types
(MCQ, T/F/NG, gap-fill, writing, speaking), timer, and review dialog
- Frontend: results page with percentage score, per-answer breakdown table
- Frontend: generation page dynamic dropdowns, full payload submission
- Frontend: updated types for ExamSessionSection, ExamQuestion options
Made-with: Cursor
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