docs(agent): clarify integration paths and skills role

[yeyitech]

Summary

• clarify the current recommended agent integration patterns: SDK/HTTP, MCP, host-specific plugins, and examples/skills
• explain that examples/skills is a narrow explicit-tool pattern, not the only general integration path
• add the same guidance to both the MCP guide and the basic usage guide in English and Chinese

Testing

• docs-only review

Refs #1276

[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ 1276 - PR Code Verified Compliant requirements: Clarify that examples/skills is not the only/general integration path Document current recommended agent integration patterns (SDK/HTTP, MCP, host-specific plugins, examples/skills) Add consistent guidance in both English and Chinese documentation Requires further human verification: Contribution guidance for agent integration documentation

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🏅 Score: 100

🧪 No relevant tests

🔒 No security concerns identified

✅ No TODO sections

🔀 No multiple PR themes

⚡ No major issues detected

[github-actions]

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