[Bug]:SKILL.md 元数据区通过多行定义数组类型数据，执行技能是报错：sequence entries are not allowed here in 'string', line 6, column 18:

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**Describe the bug**
SKILL.md 元数据区通过多行定义数组类型数据，执行技能是报错：sequence entries are not allowed here in 'string', line 6, column 18:

**To Reproduce**
Steps to reproduce the behavior:

看了这个方法的注释，AgentScope's frontmatter parser only accepts flat key: value lines，是不是这里就会把格式去除了
运行时定义在元数据区的数组格式被变成了一行，导致-校验不通过
**Expected behavior**
A clear and concise description of what you expected to happen.

**Error messages**
sequence entries are not allowed here in 'string', line 6, column 18:

**Environment (please complete the following information):**

- AgentScope-Java Version: 1.1.0-RC2
- Java Version: 21
- OS:windows

**Additional context**
Add any other context about the problem here.