xby-ocr-captcha: DeepSeek Harness CAPTCHA Recognition Plugin

`xby-ocr-captcha` is a plugin for DeepSeek Harness (DSH) that automatically recognizes captcha images. It calls an OCR model to convert images into text and is available under the MIT license. Installation is required through the `dsh` command, and an API key must be obtained from the Xiaoben Yang official website. It provides three interfaces: `ocr_captcha` (image URL), `ocr_captcha_for_data_base64` (Base64-encoded data), and `ocr_captcha_for_data_file` (local file path), making it easy for developers to integrate into agent workflows.