#727 DockerHub private repo setup for highway images

## Task Setup private DockerHub repository for highway images. ## Details - DockerHub username: rodmenalimited - Repository: rodmenalimited/highway-workflow-engine (private) - Repository: rodmenalimited/highway-dashboard (private) ## Actions 1. Create private repositories on DockerHub 2. Update ansible playbooks to push to DockerHub 3. Configure imagePullSecrets on both clusters (srv2 + minikube) 4. Update helm values to use DockerHub images for production 5. Tag images properly (e.g., :latest, :v1.0.0, :sha-abc123) ## Parent: #726