dsh-k8s-manager: A Lens-style Kubernetes Cluster Management Plugin for DSH

The DeepSeek Harness (DSH) plugin `dsh-k8s-manager` provides a Lens-like Kubernetes cluster management interface, leveraging local `kubectl` for flexible management without remote dependencies. It supports operations such as multi-cluster switching, resource browsing, real-time log viewing, interactive shell debugging, scaling, and YAML editing. Users can enable it with a simple installation command; the plugin automatically manages kubeconfig and provides secondary confirmation to ensure security.