Initial project setup: monorepo structure with frontend and backend

- Set up pnpm workspace with frontend (React + Vite) and backend (Express + Prisma)
- Configure TypeScript, ESLint, and Prettier
- Add Prisma schema for database models (User, Course, Lesson, Progress, etc.)
- Create basic frontend structure with Tailwind CSS and shadcn/ui
- Add environment configuration files
- Update README with project overview and setup instructions
- Complete Phase 0: Project initialization

packages/backend/.env.example

@@ -0,0 +1,25 @@
+# Server
+NODE_ENV=development
+PORT=3000
+FRONTEND_URL=http://localhost:5173
+
+# Database
+DATABASE_URL="mysql://user:password@192.168.1.74:3306/znakovni"
+
+# Session
+SESSION_SECRET=your-super-secret-session-key-change-in-production
+
+# OAuth - Google
+GOOGLE_CLIENT_ID=your-google-client-id
+GOOGLE_CLIENT_SECRET=your-google-client-secret
+GOOGLE_CALLBACK_URL=http://localhost:3000/api/auth/google/callback
+
+# OAuth - Microsoft
+MICROSOFT_CLIENT_ID=your-microsoft-client-id
+MICROSOFT_CLIENT_SECRET=your-microsoft-client-secret
+MICROSOFT_CALLBACK_URL=http://localhost:3000/api/auth/microsoft/callback
+
+# File Upload
+UPLOAD_DIR=./uploads
+MAX_FILE_SIZE=104857600
+