修复服务方法描述等更新网关 gateway tool list 不更新的问题

[xiangshenb]

Describe what this PR does / why we need it

修复服务方法描述更新后，网关工具列表不自动刷新的问题。
之前修改了服务方法描述，但网关的 tool list 仍然显示旧数据，导致用户看到信息不一致。
本次修改确保更新服务方法描述后，gateway tool list 会正确刷新。

Does this pull request fix one issue?

NONE

Describe how you did it

在服务方法更新逻辑中增加了 gateway tool list 的刷新调用。
保证每次修改服务方法描述后，相关缓存/列表会同步更新。

Describe how to verify it

1. 修改某个服务方法的描述
2. 查看 gateway tool list 是否立即更新显示最新描述,mcp gateway 无需重启
3. 确认旧描述不再显示，且列表功能正常

Special notes for reviews

无特殊注意事项，修改仅影响服务方法描述更新逻辑和 gateway tool list 刷新

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