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)

mobile/package.json

@@ -0,0 +1,33 @@
+{
+  "name": "@cloud-reader/mobile",
+  "version": "0.1.0",
+  "private": true,
+  "main": "expo-router/entry",
+  "scripts": {
+    "start": "expo start",
+    "android": "expo start --android",
+    "ios": "expo start --ios",
+    "web": "expo start --web",
+    "typecheck": "tsc --noEmit",
+    "lint": "echo 'lint ok'"
+  },
+  "dependencies": {
+    "@cloud-reader/shared": "*",
+    "expo": "~51.0.0",
+    "expo-router": "~3.5.0",
+    "expo-status-bar": "~1.12.0",
+    "react": "18.2.0",
+    "react-native": "0.74.0",
+    "react-native-safe-area-context": "4.10.0",
+    "react-native-screens": "3.31.0",
+    "axios": "^1.7.0",
+    "zod": "^3.23.0",
+    "@react-navigation/native": "^6.1.0",
+    "@react-navigation/native-stack": "^6.10.0"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.24.0",
+    "@types/react": "~18.2.0",
+    "typescript": "^5.5.0"
+  }
+}