fix: use docker compose v2 syntax instead of docker-compose

- Change docker-compose to 'docker compose' (v2 syntax)
- Resolves command not found error in GitHub Actions runners
- Tested locally with act (dry run successful)

Author: Rexus

.github/workflows/ci-cd.yml

@@ -71,7 +71,7 @@ jobs:
       - name: Docker sanity check
         run: |
           echo "🐳 Validating Docker Compose configuration..."
-          docker-compose config > /dev/null
+          docker compose config > /dev/null
           echo "✅ Docker Compose configuration is valid"
       
       - name: Check for errors