Add a structured output format for actions

Currently the ospo-actions each make human readable reports, but it'd be beneficial to enable structured output like JSON which could get POSTed to a url. Users who are using an external system for logging or auditing could then parse the result and make use of the data for alerts, visualizations, etc.

首先閱讀 ospo-actions 目前如何組合人類可讀的報告，以及如何處理 action 的輸入和輸出。定義結構化 JSON 資料和 POST 行為，然後驗證外部記錄或稽核系統是否能解析結果，並將其用於警示或視覺化。

由索引模型根據 Issue 內容生成。