fix(commands): propagate command-group renames and aliases to sub-commands

[he-yufeng]

问题

#9366：WebUI 里重命名指令组（或给它加别名）后，子指令只认旧前缀，新前缀无响应。

根因是两处快照不同步：子指令注册时把指令组当时的 get_complete_command_names() 快照进 parent_command_names（star_handler.py），而重命名只更新了指令组自身的 group_name 并清了它自己的 _cmpl_cmd_names 缓存（command_management.py 的 _set_filter_fragment），子指令的快照和缓存都没动，于是 get_complete_command_names() 继续返回旧前缀组合。

修法

• 新增 _refresh_sub_command_names：指令组的 fragment 或别名更新后，递归刷新子过滤器的 parent_command_names 快照并清掉 _cmpl_cmd_names 缓存，嵌套指令组同样处理。
• 在 _apply_config_to_runtime 里，只要 filter_ref 是 CommandGroupFilter 就在 fragment/别名应用后调用它，rename 和 alter alias 两条路都覆盖到。

测试

4 个新测试（tests/test_command_management.py）：扁平组重命名、嵌套组重命名、经 _apply_config_to_runtime 的 rename 传播、别名传播。全部通过；tests/test_conversation_commands.py 回归也通过。

Fixes #9366

Summary by Sourcery

Ensure command group renames and aliases are propagated to sub-commands so they match updated prefixes.

New Features:

• Add helper to refresh sub-command snapshots and caches when a command group’s name or aliases change.

Enhancements:

• Invoke sub-command refresh during runtime config application for command group filters to keep naming consistent.

Tests:

• Add tests covering direct and nested command group renames, propagation via runtime config application, and alias propagation to sub-commands.

[gemini-code-assist]

Caution

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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