feat: add global server URL configuration to debug pages

[shalousun]

• Add editable server URL input at top of debug pages with flat, seamless design that blends into the page by default
• CSS hover/focus states provide subtle visual feedback and title tooltip hints at click-to-edit behavior
• Server URL value persisted to localStorage for session survival
• resolveUrl() dynamically replaces the base URL in API requests with the user-configured server address
• Display URL now shows path only (doc.path) instead of full server-prefixed URL, since the server is globally configurable

[github-actions]

@shalousun

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Thanks for your PR. 🙏
Please check again for your PR changes whether they contain any usage configuration change, such as Add new configuration or Change default value of configuration.
If so, please add or update documents (Markdown format) in the docs/ directory of the repository smart-doc-group/smart-doc-group.github.io.

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感谢您提交的PR。 🙏
请再次查看您的PR内容，确认是否包含任何使用方式或配置参数的变更，如：新增配置参数、修改默认配置等操作。
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另外，如果您添加了新功能，请在仓库smart-doc-group/smart-doc-example-cn中提供示例代码。这将帮助其他用户了解如何使用新功能。

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