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

odoo.conf

@@ -5,7 +5,7 @@ db_host = localhost
 db_port = 5432
 http_interface = 127.0.0.1
 http_port = 8069
-addons_path = /Users/yamenahmad/projects2026/odoo/odoo19/addons_extra,/Users/yamenahmad/projects2026/odoo/odoo19/addons_enterprise,/Users/yamenahmad/projects2026/odoo/odoo19/odoo/addons
+addons_path = /Users/yamenahmad/projects2026/odoo/odoo19/backend/custom_addons,/Users/yamenahmad/projects2026/odoo/odoo19/backend/openeducat_erp-19.0/openeducat_erp-19.0,/Users/yamenahmad/projects2026/odoo/odoo19/addons_extra,/Users/yamenahmad/projects2026/odoo/odoo19/addons_enterprise,/Users/yamenahmad/projects2026/odoo/odoo19/odoo/addons
 admin_passwd = $pbkdf2-sha512$600000$W4ux9h5DyDmnFIIQ4hxDaA$bF8qJJWZLTs2IC8T74YWv1my44u4vsqvLXUfexx2I1kGvPXMwHJiZOMhaYxmC3GAuIxQI1/8HPvdQhqB8OoVMQ
 workers = 4
 max_cron_threads = 1