feat(generation): rebuild Generation Page with full AI workflows

- Rebuild GenerationPage.tsx from static placeholder to production-parity
  exam generation wizard with all 4 IELTS modules (Reading, Listening,
  Writing, Speaking) plus Level and Industry
- Add per-module config: timer, CEFR difficulty tags, access type,
  entities, approval workflow, rubric, grading system, shuffling
- Reading: AI passage generation, 5 exercise types (MCQ, Fill Blanks,
  Write Blanks, True/False, Paragraph Match), categories/types
- Listening: 4 section types, AI context generation, TTS audio generation
- Writing: Task 1/2, AI instruction generation, word limits, marks
- Speaking: 3 parts, AI script generation, avatar video generation
  with 7 avatar options
- Wire ExamStructuresPage to real CRUD API (list/create/delete)
- Add backend exam_structure model and controller (/api/exam-structures)
- Enhance ai_controller with 5 specialized generation handlers
  (passage, exercises, writing instructions, speaking script,
  listening context)
- Add POST /api/exam/generation/submit for exam creation workflow
- Fix media.service avatar video endpoint alignment
- All 12 API tests passed, browser-verified with real OpenAI calls

Made-with: Cursor

backend/custom_addons/encoach_exam_template/controllers/__init__.py

@@ -1,3 +1,4 @@
 from . import templates
 from . import ielts_exam
 from . import custom_exam
+from . import exam_structures

backend/custom_addons/encoach_exam_template/controllers/exam_structures.py

@@ -0,0 +1,87 @@
+import json
+import logging
+
+from odoo import http
+from odoo.http import request
+
+_logger = logging.getLogger(__name__)
+
+
+def _json_body():
+    try:
+        return json.loads(request.httprequest.data or '{}')
+    except Exception:
+        return {}
+
+
+def _json_response(data, status=200):
+    return request.make_json_response(data, status=status)
+
+
+class ExamStructureController(http.Controller):
+
+    @http.route('/api/exam-structures', type='http', auth='user', methods=['GET'], csrf=False)
+    def list_structures(self, **kw):
+        domain = [('active', '=', True)]
+        entity_id = kw.get('entity_id')
+        if entity_id:
+            domain.append(('entity_id', '=', int(entity_id)))
+
+        limit = int(kw.get('limit', 50))
+        offset = int(kw.get('offset', 0))
+        records = request.env['encoach.exam.structure'].search(domain, limit=limit, offset=offset, order='create_date desc')
+        total = request.env['encoach.exam.structure'].search_count(domain)
+
+        items = []
+        for r in records:
+            modules = []
+            if r.modules:
+                try:
+                    modules = json.loads(r.modules)
+                except Exception:
+                    modules = []
+            items.append({
+                'id': r.id,
+                'name': r.name,
+                'entity_id': r.entity_id.id if r.entity_id else None,
+                'entity_name': r.entity_id.name if r.entity_id else None,
+                'industry': r.industry or '',
+                'modules': modules,
+                'config': json.loads(r.config) if r.config else {},
+            })
+
+        return _json_response({'items': items, 'total': total})
+
+    @http.route('/api/exam-structures', type='http', auth='user', methods=['POST'], csrf=False)
+    def create_structure(self, **kw):
+        body = _json_body()
+        name = body.get('name')
+        if not name:
+            return _json_response({'error': 'name is required'}, status=400)
+
+        vals = {
+            'name': name,
+            'industry': body.get('industry', ''),
+            'modules': json.dumps(body.get('modules', [])),
+            'config': json.dumps(body.get('config', {})),
+        }
+        entity_id = body.get('entity_id')
+        if entity_id:
+            vals['entity_id'] = int(entity_id)
+
+        record = request.env['encoach.exam.structure'].create(vals)
+        return _json_response({
+            'id': record.id,
+            'name': record.name,
+            'entity_id': record.entity_id.id if record.entity_id else None,
+            'industry': record.industry or '',
+            'modules': json.loads(record.modules) if record.modules else [],
+        })
+
+    @http.route('/api/exam-structures/<int:structure_id>', type='http', auth='user', methods=['DELETE'], csrf=False)
+    def delete_structure(self, structure_id, **kw):
+        record = request.env['encoach.exam.structure'].browse(structure_id)
+        if not record.exists():
+            return _json_response({'error': 'Structure not found'}, status=404)
+        record.unlink()
+        return _json_response({'success': True})

backend/custom_addons/encoach_exam_template/models/__init__.py

@@ -8,3 +8,4 @@ from . import speaking_card
 from . import exam_custom
 from . import exam_custom_section
 from . import exam_assignment
+from . import exam_structure

backend/custom_addons/encoach_exam_template/models/exam_structure.py

@@ -0,0 +1,14 @@
+from odoo import models, fields
+
+
+class EncoachExamStructure(models.Model):
+    _name = 'encoach.exam.structure'
+    _description = 'Reusable Exam Structure'
+    _order = 'create_date desc'
+
+    name = fields.Char(size=200, required=True)
+    entity_id = fields.Many2one('encoach.entity', ondelete='set null')
+    industry = fields.Char(size=100)
+    modules = fields.Text(help='JSON list of module keys, e.g. ["reading","listening"]')
+    config = fields.Text(help='JSON config: timer, difficulty, passage counts per module')
+    active = fields.Boolean(default=True)

backend/custom_addons/encoach_exam_template/security/ir.model.access.csv

@@ -9,3 +9,4 @@ access_encoach_rubric_user,encoach.rubric.user,model_encoach_rubric,base.group_u
 access_encoach_exam_custom_user,encoach.exam.custom.user,model_encoach_exam_custom,base.group_user,1,1,1,1
 access_encoach_exam_custom_section_user,encoach.exam.custom.section.user,model_encoach_exam_custom_section,base.group_user,1,1,1,1
 access_encoach_exam_assignment_user,encoach.exam.assignment.user,model_encoach_exam_assignment,base.group_user,1,1,1,1
+access_encoach_exam_structure_user,encoach.exam.structure.user,model_encoach_exam_structure,base.group_user,1,1,1,1