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

frontend/docker-compose.yml

@@ -0,0 +1,9 @@
+services:
+  frontend:
+    build: .
+    image: encoach-frontend:latest
+    container_name: encoach-frontend
+    restart: unless-stopped
+    ports:
+      - "3000:3000"
+    env_file: .env