feat(kubernetes): Add Kubernetes mock data and UI
Backend:
- Add K8s cluster, node, pod, deployment mock data generation
- Configurable via PULSE_MOCK_K8S_CLUSTERS, PULSE_MOCK_K8S_NODES,
PULSE_MOCK_K8S_PODS, PULSE_MOCK_K8S_DEPLOYMENTS env vars
- Generate realistic cluster data with versions, namespaces, pod phases
- Add dynamic metric updates for K8s resources
- Deep copy K8s data in cloneState to prevent race conditions
Frontend:
- Add KubernetesClusters component with 4 view modes:
Clusters, Nodes, Pods, Deployments
- Filter bar with search, status filter, show hidden toggle
- Nodes view: status, roles, CPU/memory/pod capacity, kubelet version
- Pods view: namespace, status, ready containers, restarts, image, age
- Deployments view: replicas, ready/up-to-date status
- Matches Docker/Dashboard table styling patterns
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