feat: add k8s cluster resource management module

- Add K8s module with kubeconfig storage in cluster_config table
- Implement resource list APIs for 8 kinds: namespace, deployment, statefulset, service, configmap, pod, pv, pvc
- Add K8sResourceList page with sidebar navigation and resource tables
- Support YAML upload/input dialog for resource creation via dynamic client
- Add kubeconfig settings drawer
- Increase main content width from lg to xl for better table display
- Add navigation link for cluster resources in top bar

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internal/model/model.go

@@ -79,3 +79,14 @@ type RegistryConfig struct {
 	Key   string `gorm:"uniqueIndex;not null" json:"key"`   // ???? key
 	Value string `gorm:"type:text" json:"value"`            // ???? value
 }
+
+// ClusterConfig k8s cluster configuration
+type ClusterConfig struct {
+	ID        uint           `gorm:"primarykey" json:"id"`
+	CreatedAt time.Time      `json:"created_at"`
+	UpdatedAt time.Time      `json:"updated_at"`
+	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`
+
+	Key   string `gorm:"uniqueIndex;not null" json:"key"`
+	Value string `gorm:"type:text" json:"value"`
+}