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)

backend/internal/api/routes/routes.go

@@ -432,6 +432,9 @@ func Register(r *gin.Engine, db *gorm.DB, log *zap.Logger, cfg *config.Config, c
 		kubernetesRouter.GET("/:clusterCode/namespace/:namespace/:resource/:name/yaml", k8sHandler.GetResourceYAMLNS)
 		kubernetesRouter.PUT("/:clusterCode/namespace/:namespace/:resource/:name/yaml", k8sHandler.UpdateResourceYAMLNS)
 		kubernetesRouter.DELETE("/:clusterCode/namespace/:namespace/:resource/:name/yaml", k8sHandler.DeleteResourceYAMLNS)
+
+		// 🆕 M13: 多集群资源对比看板
+		kubernetesRouter.GET("/compare", k8sHandler.GetMultiClusterComparison)
 	}
 
 	// 告警路由