Add AI guidelines to API documentation

[Tosd0]

为README和两个标准文档添加AI使用须知：

• API标准必须严格遵循
• Service Worker规范为推荐实现
• 扩展功能应使用可选字段或metadata
• 发现问题应联系仓库负责人，不应直接修改标准文档

[gemini-code-assist]

Summary of Changes

Hello @Tosd0, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

本次拉取请求旨在通过在核心文档中引入AI编程助手使用指南，规范用户（尤其是AI辅助用户）与技术标准文档的交互方式。这些指南旨在确保标准的完整性和一致性，同时为功能扩展和问题反馈提供清晰的路径，从而维护文档的权威性和可维护性。

Highlights

• AI使用须知添加: 在README.md、standards/active-messaging-api.md和standards/service-worker-specification.md文件中新增了关于AI编程助手使用的指导原则。
• API标准严格遵循: 明确指出API标准（如端点、格式、字段）必须严格遵循，不应随意修改。
• Service Worker规范为推荐实现: 指出Service Worker规范为推荐实现方案，允许根据实际需求灵活调整，但通知数据结构需与API标准保持一致。
• 扩展功能方式: 强调扩展功能应通过可选字段或元数据实现，而非修改现有标准字段。
• 问题处理流程: 规定发现标准问题时应联系仓库负责人讨论，不应直接修改标准文档。

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[gemini-code-assist]

Code Review

本次 PR 为三个核心文档（README、API 标准、Service Worker 规范）添加了 AI 编程助手使用须知，这是一个非常有价值的补充，能够有效引导 AI 工具正确理解和使用仓库中的技术标准，避免误操作。整体内容清晰，要点明确。我针对文档中的一些措辞提出了几点微调建议，主要是为了增强指引的精确性和一致性，例如将模糊的“用户”一词统一为更具体的“开发者”，并统一了 metadata 的表述方式。这些修改将使文档对开发者和 AI 都更加友好。