fix: K8s集群编辑保存失败+凭据覆盖+去掉Kubectl死按钮

问题:
1. UpdateCluster 用 CreateK8sClusterRequest (code binding:"required"),
   编辑时不传 code → 校验失败 400 → 保存不成功
2. Token/KubeConfig json:"-" 不序列化, 编辑时拿不到原值,
   提交空字符串覆盖真实凭据
3. 操作菜单 Kubectl 是死按钮

修复:
- UpdateCluster 改用 map[string]interface{} 接收, 逐字段更新,
  空值不覆盖 (防止凭据清空)
- 新增 GET /:id/detail 返回 has_token/has_kube_config 脱敏标记
- 编辑弹框拉取详情 API 回填, Token/KubeConfig 留空显示 '已配置' 提示
- 去掉 Kubectl 死按钮, 保留 详情/配置/删除 三项

frontend/src/components/k8s/K8sClusterDialog.tsx

@@ -37,21 +37,42 @@ export function K8sClusterDialog({
 }) {
   const [formData, setFormData] = useState({ ...emptyForm });
   const [submitting, setSubmitting] = useState(false);
+  const [hasToken, setHasToken] = useState(false);   // 已配置 Token 标记 // Logan.Li
+  const [hasKubeConfig, setHasKubeConfig] = useState(false); // 已配置 Kubeconfig 标记
 
-  // 打开时同步表单（编辑时填充，新建时重置）
+  // 打开时同步表单（编辑时拉取详情，新建时重置）
   useEffect(() => {
     if (!open) return;
-    if (editingCluster) {
-      setFormData({
-        name: editingCluster.name || '',
-        version: editingCluster.version || '',
-        description: editingCluster.description || '',
-        config_type: Number(editingCluster.config_type ?? 1),
-        api_server: editingCluster.api_server || '',
-        token: editingCluster.token || '',
-        kube_config: editingCluster.kube_config || '',
+    if (editingCluster && editingCluster.id) {
+      // 编辑模式：拉取详情获取 has_token/has_kube_config 标记 // Logan.Li
+      k8sApi.getClusterDetail(editingCluster.id).then((res: any) => {
+        const d = res || {};
+        setHasToken(!!d.has_token);
+        setHasKubeConfig(!!d.has_kube_config);
+        setFormData({
+          name: d.name || '',
+          version: d.version || '',
+          description: d.description || '',
+          config_type: Number(d.config_type ?? 1),
+          api_server: d.api_server || '',
+          token: '',         // 不回填原文，留空不修改
+          kube_config: '',   // 不回填原文，留空不修改
+        });
+      }).catch(() => {
+        // 降级：用列表数据
+        setFormData({
+          name: editingCluster.name || '',
+          version: editingCluster.version || '',
+          description: editingCluster.description || '',
+          config_type: Number(editingCluster.config_type ?? 1),
+          api_server: editingCluster.api_server || '',
+          token: '',
+          kube_config: '',
+        });
       });
     } else {
+      setHasToken(false);
+      setHasKubeConfig(false);
       setFormData({ ...emptyForm });
     }
   }, [open, editingCluster]);
@@ -171,28 +192,34 @@ export function K8sClusterDialog({
 
           {formData.config_type === 0 ? (
             <div className="space-y-2">
-              <Label className="text-[var(--dg-text-secondary)]">Token</Label>
+              <Label className="text-[var(--dg-text-secondary)]">
+                Token {hasToken && <span className="text-emerald-400 text-xs ml-1">✓ 已配置（留空不修改）</span>}
+              </Label>
               <Textarea
                 value={formData.token}
                 onChange={(e) => setFormData({ ...formData, token: e.target.value })}
-                placeholder="粘贴 Service Account Token..."
+                placeholder={hasToken ? '已配置，输入新值覆盖...' : '粘贴 Service Account Token...'}
                 rows={4}
                 className="bg-[var(--dg-bg-tertiary)] border-[var(--dg-border)] text-[var(--dg-text-primary)] placeholder:text-[var(--dg-text-muted)] font-mono text-xs"
               />
             </div>
           ) : (
             <div className="space-y-2">
-              <Label className="text-[var(--dg-text-secondary)]">Kubeconfig</Label>
+              <Label className="text-[var(--dg-text-secondary)]">
+                Kubeconfig {hasKubeConfig && <span className="text-emerald-400 text-xs ml-1">✓ 已配置（留空不修改）</span>}
+              </Label>
               <Textarea
                 value={formData.kube_config}
                 onChange={(e) => handleKubeConfigChange(e.target.value)}
-                placeholder={'apiVersion: v1\nkind: Config\nclusters:\n- cluster:\n    server: https://10.0.0.1:6443\n    ...'}
+                placeholder={hasKubeConfig ? '已配置，输入新值覆盖...' : 'apiVersion: v1\nkind: Config\nclusters:\n- cluster:\n    server: https://10.0.0.1:6443\n    ...'}
                 rows={10}
                 className="bg-[var(--dg-bg-tertiary)] border-[var(--dg-border)] text-[var(--dg-text-primary)] placeholder:text-[var(--dg-text-muted)] font-mono text-xs"
               />
-              <p className="text-xs text-[var(--dg-text-muted)]">
-                粘贴 kubeconfig 内容后将自动解析 API Server 地址
-              </p>
+              {!hasKubeConfig && (
+                <p className="text-xs text-[var(--dg-text-muted)]">
+                  粘贴 kubeconfig 内容后将自动解析 API Server 地址
+                </p>
+              )}
             </div>
           )}
         </div>

frontend/src/components/k8s/K8sClusters.tsx

@@ -25,7 +25,6 @@ import {
   Settings,
   Eye,
   Trash2,
-  Terminal,
   Search,
 } from 'lucide-react';
 import { k8sApi } from '@/services/api';
@@ -263,10 +262,6 @@ export function K8sClusters() {
                             <Eye className="h-4 w-4 mr-2" />
                             查看详情
                           </DropdownMenuItem>
-                          <DropdownMenuItem className="text-slate-300 focus:bg-slate-700 focus:text-slate-100">
-                            <Terminal className="h-4 w-4 mr-2" />
-                            Kubectl
-                          </DropdownMenuItem>
                           <DropdownMenuItem
                             className="text-slate-300 focus:bg-slate-700 focus:text-slate-100"
                             onClick={(e) => {

frontend/src/services/api.ts

@@ -161,7 +161,7 @@ export const k8sApi = {
     return http.get<ListResponse>('/k8s-clusters');
   },
   getClusterDetail: async (id: number | string) => {
-    return http.get(`/k8s-clusters/${id}`);
+    return http.get(`/k8s-clusters/${id}/detail`);
   },
   createCluster: async (data: any) => {
     return http.post('/k8s-clusters', data);