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/__manifest__.py

@@ -0,0 +1,16 @@
+{
+    'name': 'EnCoach Taxonomy',
+    'version': '19.0.1.0',
+    'category': 'Education',
+    'summary': 'Subject taxonomy: subjects, domains, topics, learning objectives',
+    'author': 'EnCoach',
+    'depends': ['encoach_core'],
+    'data': [
+        'security/ir.model.access.csv',
+        'views/taxonomy_views.xml',
+        'data/default_subjects.xml',
+        'data/math_it_taxonomy.xml',
+    ],
+    'installable': True,
+    'license': 'LGPL-3',
+}