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)

package.json

@@ -0,0 +1,19 @@
+{
+  "name": "cloud-reader",
+  "private": true,
+  "workspaces": [
+    "shared",
+    "frontend",
+    "mobile"
+  ],
+  "scripts": {
+    "frontend:dev": "yarn workspace @cloud-reader/frontend dev",
+    "frontend:build": "yarn workspace @cloud-reader/frontend build",
+    "mobile:start": "yarn workspace @cloud-reader/mobile start",
+    "mobile:android": "yarn workspace @cloud-reader/mobile android",
+    "mobile:ios": "yarn workspace @cloud-reader/mobile ios",
+    "shared:build": "yarn workspace @cloud-reader/shared build",
+    "lint": "yarn workspaces run lint",
+    "typecheck": "yarn workspaces run typecheck"
+  }
+}