集群限流手动创建token server没有生效，退化成单机限流

起了3台服务，然后手动创建嵌入式部署，创建好规则后，没有集群限流效果，使用SPI动态加载nacos限流规则和集群配置后才有效果

Start by reproducing the three-service embedded deployment with a manually created token server and flow-control rules. Compare its initialization with the SPI-loaded Nacos flow rules and cluster configuration, then verify that requests are limited across services rather than falling back to standalone limiting; the issue names no files or tests to run.

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