feat: 添加开发者工具提示信息功能

[jhll1124]

Type of change

• Bug fix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please describe):

Checklist

• I have read the CONTRIBUTING document.
• I have checked to ensure that this Pull Request is not for personal changes.
• I have performed a self-review of my own code.
• My changes generate no new warnings.

Changes

新增 开发者工具提示信息（devtools warning） 功能。

当用户通过明确用于打开浏览器开发者工具的快捷键（如 F12、Ctrl+Shift+I/J/C、Cmd+Option+I/J/C 等）尝试打开开发者工具时，页面顶部会显示一次提示卡片，用于展示自定义的提示信息。提示仅展示一次，不阻断用户操作，也不干扰开发者工具的正常使用。提示是否启用、内容与显示时长可在 siteConfig 中配置。

How To Test

1. 启动

2. 打开页面后，使用以下任意快捷键尝试打开开发者工具：

   • F12
   • Ctrl + Shift + I / J / C
   • Cmd + Option + I / J / C（macOS）

3. 确认页面顶部显示提示卡片，并在进度条结束后自动隐藏

4. 刷新页面后再次触发，确认提示只会显示一次

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