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/src/server.ts

@@ -0,0 +1,44 @@
+import express from 'express';
+import cors from 'cors';
+import helmet from 'helmet';
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+const app = express();
+const PORT = process.env.PORT || 3000;
+
+// Middleware
+app.use(helmet());
+app.use(cors({
+  origin: process.env.FRONTEND_URL || 'http://localhost:5173',
+  credentials: true,
+}));
+app.use(express.json());
+app.use(express.urlencoded({ extended: true }));
+
+// Health check route
+app.get('/api/health', (_req, res) => {
+  res.json({ 
+    status: 'ok', 
+    message: 'Backend is running!',
+    timestamp: new Date().toISOString(),
+  });
+});
+
+// Root route
+app.get('/', (_req, res) => {
+  res.json({ 
+    message: 'Znakovni.hr API',
+    version: '1.0.0',
+  });
+});
+
+// Start server
+app.listen(PORT, () => {
+  console.log(`🚀 Server running on http://localhost:${PORT}`);
+  console.log(`📝 Environment: ${process.env.NODE_ENV || 'development'}`);
+});
+
+export default app;
+