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_signup/models/otp.py

@@ -0,0 +1,13 @@
+from odoo import models, fields
+
+
+class EncoachOtp(models.Model):
+    _name = 'encoach.otp'
+    _description = 'OTP Verification Record'
+
+    email = fields.Char(required=True, index=True)
+    otp_hash = fields.Char(required=True)
+    expires_at = fields.Datetime(required=True)
+    used = fields.Boolean(default=False)
+    resend_count = fields.Integer(default=0)
+    created_at = fields.Datetime(default=fields.Datetime.now)