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)

backend/pyproject.toml

@@ -0,0 +1,33 @@
+[project]
+name = "cloud-reader-backend"
+version = "0.1.0"
+description = "Cloud Reader API — Django REST Framework backend"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = [
+    "django>=5.1,<6.0",
+    "djangorestframework>=3.15,<4.0",
+    "django-cors-headers>=4.3",
+    "django-filter>=24.3",
+    "psycopg2-binary>=2.9",
+    "python-decouple>=3.8",
+    "djangorestframework-simplejwt>=5.3",
+    "drf-spectacular>=0.27",
+    "gunicorn>=22.0",
+    "whitenoise>=6.6",
+    "Pillow>=10.3",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.0",
+    "pytest-django>=4.8",
+    "pytest-cov>=5.0",
+    "model-bakery>=1.17",
+    "ruff>=0.5",
+    "ipdb>=0.13",
+]
+
+[build-system]
+requires = ["setuptools>=72"]
+build-backend = "setuptools.build_meta"