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/prisma/seed.ts

@@ -0,0 +1,31 @@
+import { PrismaClient } from '@prisma/client';
+
+const prisma = new PrismaClient();
+
+async function main() {
+  console.log('🌱 Starting database seed...');
+
+  // Create a sample user
+  const user = await prisma.user.create({
+    data: {
+      email: 'demo@znakovni.hr',
+      displayName: 'Demo User',
+      authProvider: 'local',
+    },
+  });
+
+  console.log('✅ Created demo user:', user.email);
+
+  // Add sample terms here in future phases
+  console.log('✅ Seed completed successfully!');
+}
+
+main()
+  .catch((e) => {
+    console.error('❌ Seed failed:', e);
+    process.exit(1);
+  })
+  .finally(async () => {
+    await prisma.$disconnect();
+  });
+