refactor: remove agfs port configuration

[qin-ctx]

Description

移除 AGFS 端口配置，因为 AGFS 不再需要显式配置端口。

Type of Change

• Refactoring (no functional changes)
• Documentation update

Changes Made

• 从 INSTALL.md 和 INSTALL-ZH.md 中移除 agfs port 配置示例
• 从 install.ps1 中移除 AGFS 端口相关配置
• 从 install.sh 中移除 AGFS 端口相关配置
• 从 setup-helper/cli.js 中移除 AGFS 端口相关配置

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

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

🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

[github-actions]

PR Code Suggestions ✨

No code suggestions found for the PR.