[FEATURE]: Add Skill Configuration to Config Type

[wch-abc]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Request to add skill configuration support to the Config type, similar to existing agent, command, mcp, and plugin configurations. This would enable skill management through config hooks and provide better extensibility.

[github-actions]

Related discussion: This feature request follows a similar pattern to #4393 which requests configuration support for plugins. You might want to check that issue to understand the broader context of adding configuration support to different extensibility types in the Config type.