xby-general-recognition: Introducing the General Recognition Plugin

`xby-general-recognition` is a model inference plugin for DeepSeek Harness (DSH) that enables direct image recognition service calls within conversations. This plugin supports three input formats: image URLs, BASE64-encoded data, and file paths, and can identify the main objects in images by outputting class labels (covering over 50,000 categories). Users must first register on the official website to obtain an API key, which can then be activated using `set_xby_apikey`. The plugin is maintained by `xby-skill`, is released under the MIT license, and runs with the privileges of the current process.