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

custom_addons/encoach_exam_template/data/ir_cron_schedule.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <data noupdate="1">
+        <record id="ir_cron_exam_schedule_lifecycle" model="ir.cron">
+            <field name="name">Exam Schedule Lifecycle</field>
+            <field name="model_id" ref="model_encoach_exam_schedule"/>
+            <field name="state">code</field>
+            <field name="code">model.update_lifecycle_states()</field>
+            <field name="interval_number">1</field>
+            <field name="interval_type">minutes</field>
+            <field name="active">True</field>
+        </record>
+    </data>
+</odoo>