feat(k8s): M13 多集群资源对比看板 — GetMultiClusterComparison handler + ClusterComparePage (柱状图/雷达图/饼图/详细对比表)

frontend/src/services/api.ts

@@ -497,6 +497,11 @@ export const kubernetesApi = {
     return http.get(`/kubernetes/${clusterCode}/capacity`, params);
   },
 
+  // === 🆕 M13: 多集群资源对比看板 ===
+  getMultiClusterComparison: async () => {
+    return http.get('/kubernetes/compare');
+  },
+
   // === 🆕 YAML Apply ===
   applyYAML: async (clusterCode: string, yaml: string) => {
     return http.post(`/kubernetes/${clusterCode}/yaml/apply`, { yaml });