feat: monorepo structure with Django backend, React frontend, and Expo mobile app

- Backend: Django 5 + DRF with accounts, documents, collections, and reading apps
  - Custom User model with email-based auth, JWT via SimpleJWT
  - Full CRUD viewsets with ModelSerializer + DRF routers
  - pytest, Ruff, drf-spectacular (OpenAPI), whitenoise
  - Dockerfile for production deployment

- Frontend: React 18 + TypeScript + Vite
  - Lazy-loaded routes with ProtectedRoute/PublicRoute guards
  - Auth context with useReducer, token refresh interceptor
  - Pages: Login, Register, Library, Document Detail, Reader, Collections, Settings
  - Dark theme, responsive grid layout, Vite proxy to Django backend

- Mobile: Expo SDK 51 + React Native + Expo Router
  - File-based routing with login, register, and library screens
  - AsyncStorage for token persistence, token refresh interceptor
  - Shared API types via @cloud-reader/shared workspace package

- Shared: TypeScript types (API responses, auth, documents, etc.)
- CI/CD: 3 independent GitHub Actions pipelines (backend, frontend, mobile)

docker-compose.yml

@@ -0,0 +1,39 @@
+version: "3.9"
+
+services:
+  db:
+    image: postgres:16
+    environment:
+      POSTGRES_DB: cloud_reader
+      POSTGRES_USER: cloud_reader
+      POSTGRES_PASSWORD: cloud_reader
+    ports:
+      - "5432:5432"
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+
+  backend:
+    build: backend
+    ports:
+      - "8000:8000"
+    environment:
+      SECRET_KEY: development-secret-key
+      DEBUG: "True"
+      DB_HOST: db
+      DB_NAME: cloud_reader
+      DB_USER: cloud_reader
+      DB_PASSWORD: cloud_reader
+      CORS_ALLOWED_ORIGINS: http://localhost:5173,http://localhost:3000
+      ALLOWED_HOSTS: localhost,127.0.0.1
+    depends_on:
+      - db
+
+  frontend:
+    build: frontend
+    ports:
+      - "5173:80"
+    depends_on:
+      - backend
+
+volumes:
+  pgdata: