DeepSeek Harness Plugin: computer-user-vision

`computer-user-vision` is an unofficial plugin designed specifically for DeepSeek Harness (DSH) on the Windows platform. It aims to fix the silent loading failure issue in the original version with DSH 0.1.2+ and return screenshots as actual image data rather than paths, enabling visual models to read them accurately. The plugin enhances UI Automation support by providing features such as window management, element clicking, secure input checking, and DPI awareness, filling the gap in Windows visual automation scenarios for DSH.