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/apps/reading/urls.py

@@ -0,0 +1,15 @@
+from django.urls import include, path
+from rest_framework.routers import DefaultRouter
+
+from . import views
+
+router = DefaultRouter()
+router.register("bookmarks", views.BookmarkViewSet, basename="bookmark")
+router.register("highlights", views.HighlightViewSet, basename="highlight")
+router.register("progress", views.ReadingProgressViewSet, basename="reading-progress")
+
+app_name = "reading"
+
+urlpatterns = [
+    path("", include(router.urls)),
+]