feat(v3): restructure project + add complete frontend

- Restructure: move backend from new_project/ to backend/
- Add full React/TypeScript frontend (37 pages, 17 services, 16 type defs, 11 query hooks)
- Add docs/ with SRS specs, user stories, and workflow documentation
- Update .gitignore for new directory layout

Workflows implemented:
  WF1 User Signup, WF2 Placement Test, WF3 Exam Configuration,
  WF4 General English Exam, WF5 Course Generation,
  WF6 Entity Student Onboarding, AI Course Generation,
  Adaptive Learning Engine UI, White-Label Branding, Score Release

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)