🐛 [Bug]: useSkill.ts 文件中 skillPromptPart 是个Promise，导致skills无法注入system提示词中

[alvin-xin]

Version of @opentiny/next-sdk (and @opentiny/next-remoter if applicable)

@opentiny/next-remoter 0.3.3

Node.js Version

v24.10.0

Link to minimal reproduction

启动doc-ai项目，查看浏览器调用的接口参数，就能发现skills meta内容没有注入到system提示词当中

Step to reproduce

如上

What is expected

No response

What is actually happening

No response

What is your project name

doc-ai

Any additional comments (optional)

No response