feat: initial backend codebase — EnCoach v3

Complete Odoo 19 backend with 25 custom addons:
- encoach_core: user/entity/role management
- encoach_api: REST API + JWT auth
- encoach_ai: OpenAI integration, AI settings, generation
- encoach_ai_course: AI-powered English & IELTS course generation
- encoach_exam_template/session: exam creation, structures, sessions
- encoach_scoring: AI auto-grading + manual approval
- encoach_vector: pgvector RAG integration
- encoach_adaptive: adaptive learning engine
- encoach_placement: placement testing
- encoach_taxonomy/resources: content taxonomy & resource management
- Plus 14 more modules for courses, branding, portal, etc.

Includes docs: user guide, generation report, developer workflow.

Made-with: Cursor

custom_addons/encoach_placement/models/__init__.py

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+from . import cat_session
+from . import student_ability

custom_addons/encoach_placement/models/cat_session.py

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+from odoo import models, fields
+
+
+class EncoachCatSession(models.Model):
+    _name = 'encoach.cat.session'
+    _description = 'CAT Placement Session'
+
+    student_id = fields.Many2one('res.users', required=True, ondelete='cascade', index=True)
+    subject_id = fields.Many2one('encoach.subject', ondelete='set null')
+    started_at = fields.Datetime(default=fields.Datetime.now)
+    completed_at = fields.Datetime()
+    status = fields.Selection([
+        ('active', 'Active'),
+        ('completed', 'Completed'),
+        ('abandoned', 'Abandoned'),
+    ], default='active', required=True)
+    current_section = fields.Selection([
+        ('listening', 'Listening'),
+        ('reading', 'Reading'),
+        ('writing', 'Writing'),
+        ('speaking', 'Speaking'),
+        ('grammar', 'Grammar'),
+        ('vocabulary', 'Vocabulary'),
+    ])
+    current_theta = fields.Float(default=0.0)
+    current_sem = fields.Float(default=1.0)
+    questions_answered = fields.Integer(default=0)
+    autosave_data = fields.Text()

custom_addons/encoach_placement/models/student_ability.py

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+from odoo import models, fields
+
+
+class EncoachStudentAbilityModel(models.Model):
+    _name = 'encoach.student.ability.model'
+    _description = 'Student Ability Estimate per Skill'
+
+    student_id = fields.Many2one('res.users', required=True, ondelete='cascade', index=True)
+    subject_id = fields.Many2one('encoach.subject', ondelete='set null')
+    skill = fields.Selection([
+        ('listening', 'Listening'),
+        ('reading', 'Reading'),
+        ('writing', 'Writing'),
+        ('speaking', 'Speaking'),
+        ('grammar', 'Grammar'),
+        ('vocabulary', 'Vocabulary'),
+    ])
+    theta = fields.Float(default=0.0)
+    sem = fields.Float(default=1.0)
+    last_updated = fields.Datetime(default=fields.Datetime.now)
+
+    _sql_constraints = [
+        ('unique_student_subject_skill',
+         'unique(student_id, subject_id, skill)',
+         'Duplicate ability record'),
+    ]