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/admin.py

@@ -0,0 +1,21 @@
+from django.contrib import admin
+
+from .models import Bookmark, Highlight, ReadingProgress
+
+
+@admin.register(Bookmark)
+class BookmarkAdmin(admin.ModelAdmin):
+    list_display = ["document", "user", "page", "label", "created_at"]
+    list_filter = ["created_at"]
+
+
+@admin.register(Highlight)
+class HighlightAdmin(admin.ModelAdmin):
+    list_display = ["document", "user", "page", "color", "created_at"]
+    list_filter = ["color", "created_at"]
+
+
+@admin.register(ReadingProgress)
+class ReadingProgressAdmin(admin.ModelAdmin):
+    list_display = ["document", "user", "percentage", "last_read_at"]
+    date_hierarchy = "last_read_at"