feat(k8s): M10 Node 详情页 — PID/容器运行时/分配率

- 后端: GetNodeDetail handler — 获取单个节点完整信息
  * 系统信息: container_runtime/architecture/kubelet/os/kernel
  * 资源分配率: 遍历 Pod 计算 CPU/Memory/Pods requested vs allocatable
  * metrics-server 数据注入 (cpu_usage_m/mem_usage_mi)
  * 全量 conditions/taints/labels + 节点上的 Pod 列表
- 后端: K8s 客户端扩展
  * NodeTaint/NodeCondition 扩展字段 (reason/message)
  * NodeInfo 增加 architecture/operatingSystem
  * GetNode(name) 单节点查询方法
  * parseCpuToMilli()/parseMemToMi() 资源解析辅助函数
- 后端: 注册路由
  * GET /kubernetes/:clusterCode/nodes/:name (Kuboard code)
  * GET /kubernetes-clusters/:id/nodes/:name (ID)
- 前端: NodeDetailPage.tsx (~330行)
  * 系统信息卡片 + 资源分配率卡片(进度条)
  * 条件卡片 + 污点卡片 + 标签卡片 + Pod 列表
- 前端: 节点名称可点击跳转 (ClusterOverviewPage)
- 验证: API/SPA/TS/Vite 全部通过

backend/pkg/kubernetesclient/client.go

@@ -209,7 +209,15 @@ type NodeItem struct {
 }
 
 type NodeSpec struct {
-	PodCIDR string `json:"podCIDR"`
+	PodCIDR string      `json:"podCIDR"`
+	Taints  []NodeTaint `json:"taints,omitempty"`
+}
+
+type NodeTaint struct {
+	Key       string `json:"key"`
+	Value     string `json:"value"`
+	Effect    string `json:"effect"`
+	TimeAdded string `json:"timeAdded,omitempty"`
 }
 
 type NodeStatus struct {
@@ -223,15 +231,19 @@ type NodeStatus struct {
 type ResourceList map[string]string
 
 type NodeCondition struct {
-	Type   string `json:"type"`
-	Status string `json:"status"`
+	Type    string `json:"type"`
+	Status  string `json:"status"`
+	Reason  string `json:"reason,omitempty"`
+	Message string `json:"message,omitempty"`
 }
 
 type NodeInfo struct {
-	KubeletVersion    string `json:"kubeletVersion"`
-	OSImage           string `json:"osImage"`
-	KernelVersion     string `json:"kernelVersion"`
+	KubeletVersion          string `json:"kubeletVersion"`
+	OSImage                 string `json:"osImage"`
+	KernelVersion           string `json:"kernelVersion"`
 	ContainerRuntimeVersion string `json:"containerRuntimeVersion"`
+	Architecture            string `json:"architecture"`
+	OperatingSystem         string `json:"operatingSystem"`
 }
 
 type NodeAddress struct {
@@ -421,6 +433,15 @@ func (c *Client) ListNodes() (*NodeList, error) {
 	return &result, nil
 }
 
+// GetNode fetches a single node by name
+func (c *Client) GetNode(name string) (*NodeItem, error) {
+	var result NodeItem
+	if err := c.get("/api/v1/nodes/"+name, &result); err != nil {
+		return nil, err
+	}
+	return &result, nil
+}
+
 // ListPods fetches all pods across namespaces
 func (c *Client) ListPods() (*PodList, error) {
 	var result PodList
@@ -672,7 +693,7 @@ func (c *Client) ExecInPod(namespace, podName, container string, command []strin
 
 	dialer := websocket.Dialer{
 		TLSClientConfig: c.TLSConfig,
-		Subprotocols:    []string{"channel.k8s.io"},
+		Subprotocols:    []string{"v4.channel.k8s.io", "v3.channel.k8s.io", "channel.k8s.io"},
 		HandshakeTimeout: 10 * time.Second,
 	}
 	header := http.Header{}