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_taxonomy/models/subject.py

@@ -0,0 +1,24 @@
+from odoo import models, fields
+
+
+class EncoachSubject(models.Model):
+    _name = 'encoach.subject'
+    _description = 'Taxonomy Subject'
+    _order = 'sequence, name'
+
+    name = fields.Char(required=True, index=True)
+    code = fields.Char(size=20, index=True)
+    description = fields.Text()
+    sequence = fields.Integer(default=10)
+    active = fields.Boolean(default=True)
+    domain_ids = fields.One2many('encoach.domain', 'subject_id', string='Domains')
+
+    def to_api_dict(self):
+        self.ensure_one()
+        return {
+            'id': self.id,
+            'name': self.name,
+            'code': self.code or '',
+            'description': self.description or '',
+            'active': self.active,
+        }