Feat: support subfolder for skill_id

[wangxingjun778]

1. In the form of: owner/skill_name/subfolder, e.g. ms-agent/skill_examples/pdf (refer to: https://modelscope.cn/models/ms-agent/skill_examples)

[gemini-code-assist[bot]]

Summary of Changes

Hello @wangxingjun778, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant feature that allows users to specify a subfolder within a skill repository when referencing skill_ids. This enhancement provides greater flexibility and efficiency by enabling the system to download only the necessary sub-parts of a skill, rather than the entire repository. The change involves updating the core skill processing logic to parse the new skill_id format, modifying repository ID validation, and updating relevant documentation and examples to guide users on its adoption.

Highlights

• Subfolder Support for Skill IDs: The system now recognizes skill_ids in the format owner/skill_name/subfolder, allowing for more granular skill referencing from the ModelScope Hub.
• Targeted Skill Downloads: When a subfolder is specified in the skill_id, the snapshot_download function is now configured to download only the content within that specific subfolder, improving efficiency and reducing unnecessary data transfer.
• Documentation Updates: Both English and Chinese documentation, along with the agent_skills example README, have been updated to clearly explain the new skill_id format and its usage.
• Repository ID Validation Enhancement: The valid_repo_id utility function has been modified to correctly validate the new owner/skill_name/subfolder format, ensuring consistency across the system.

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