Change frontend port from 80 to 4200 for better compatibility

Changed the frontend container port mapping from 80:80 to 4200:80 to avoid conflicts with system services and improve browser compatibility on macOS.

Port 4200 is the standard Angular development port and is less likely to be blocked by system security settings or conflict with other services.

**Access:**
- Frontend: http://localhost:4200
- API: http://localhost:8000
- MinIO Console: http://localhost:9001

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docker-compose.yml

@@ -64,7 +64,7 @@ services:
       args:
         NPM_REGISTRY: ${NPM_REGISTRY:-https://registry.npmjs.org/}
     ports:
-      - "80:80"
+      - "4200:80"
     depends_on:
       - api
     healthcheck: