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_adaptive/__manifest__.py

@@ -0,0 +1,26 @@
+{
+    'name': 'EnCoach Adaptive Learning',
+    'version': '19.0.1.0',
+    'category': 'Education',
+    'summary': 'Proficiency tracking, learning plans, diagnostics, content cache',
+    'author': 'EnCoach',
+    'depends': ['encoach_core', 'encoach_taxonomy', 'mail'],
+    'data': [
+        'security/ir.model.access.csv',
+        'data/ir_cron.xml',
+        'views/adaptive_event_views.xml',
+        'views/adaptive_path_views.xml',
+        'views/adaptive_settings_views.xml',
+        'views/signal_timeline_action.xml',
+        'views/adaptive_menus.xml',
+    ],
+    'assets': {
+        'web.assets_backend': [
+            'encoach_adaptive/static/src/js/signal_timeline.js',
+            'encoach_adaptive/static/src/xml/signal_timeline.xml',
+            'encoach_adaptive/static/src/css/signal_timeline.css',
+        ],
+    },
+    'installable': True,
+    'license': 'LGPL-3',
+}