ci: 添加 GitHub Pages 部署 workflow（测试 PR）

[HeJiaYue520]

🔗 相关 Issue

测试 GitHub 配置规范化

📝 变更类型

• 👷 ci: CI 配置

📋 变更说明

变更前

无 deploy-gh-pages.yaml 文件

变更后

新增 deploy-gh-pages.yaml，支持自动部署文档到 GitHub Pages

🧪 测试计划

• 验证 workflow 文件语法正确
• 验证 push 到分支后触发 workflow

✅ Checklist

• 遵循项目的代码规范（commitlint）
• 已进行自我代码审查

📦 Changeset

• 此 PR 不需要 changeset（仅 CI 配置变更）

[coderabbitai]

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Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch test-github-config

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