关于Sentinel对gateway的集群操作

1.Sentinel是否支持gateway的集群操作
2.如果支持我需要怎么使用
3.关于Sentinel + gateway + nacos 的持久化操作，在项目初始化时只拉取了数据到内存，但未生效

Start by reviewing Sentinel's gateway cluster-operation and Nacos persistence integration entry points; the issue names no files or tests. Reproduce the initialization where data is loaded into memory but does not take effect, then establish whether gateway clustering is supported and document or fix the persistence behavior.

Written by the indexing model from the issue text.