fix(k8s): Deployment 存储挂载六种卷类型 YAML 双向映射

- 抽取 deployment-volume-utils，修正 PVC/NFS/CM/Secret/HostPath/EmptyDir 读写
- 保存时保留系统卷与 serviceAccount 挂载，合并用户卷与挂载点
- 挂载支持 subPath；ConfigMap/Secret items 支持 key:path 简写

frontend/src/components/kubernetes/DeploymentWorkload.tsx

@@ -100,18 +100,8 @@ export function DeploymentWorkload({ clusterCode, namespace, deploymentName, mod
   const loadManifest = useCallback(async () => {
     try {
       const yamlText = await kubernetesApi.getResourceYaml(clusterCode, namespace, 'deployments', deploymentName);
-      // 简易 YAML→JSON：交给浏览器原生 JSON.parse 兜底（K8s API 多以 JSON 返回）；
-      // 若是纯 YAML，则尝试用 js-yaml（如项目已安装），否则保留为 null 让编辑模式降级。
-      let parsed: Record<string, any> = null;
-      try { parsed = JSON.parse(yamlText); } catch {
-        // 非纯 JSON，尝试动态加载 js-yaml
-        try {
-          const jsyaml: Record<string, any> = await import('js-yaml');
-          parsed = jsyaml.load(yamlText);
-        } catch {
-          parsed = null;
-        }
-      }
+      const { parseEditableManifest } = await import('./k8s-manifest-utils');
+      const { manifest: parsed } = await parseEditableManifest(yamlText);
       setManifest(parsed || deployment);
     } catch (e) {
       console.warn('加载 manifest 失败（编辑功能降级）:', e);