dsh-panel-tint: DeepSeek Harness Panel Background Tint Control Plugin

`dsh-panel-tint` is a DeepSeek Harness (DSH) plugin designed to solve the challenge of adjusting panel area transparency, particularly with compatibility for Wallpaper Engine (WE) mode. It provides three independent sliders to separately control the background opacity of the sidebar, content box, and input box (0–100%). Core features include intelligent color detection that preserves the skin's original background color, gradients, rounded corners, and shadow styles while adjusting only the opacity; when adjusting the content box, the outer frame style is retained. The plugin is adaptive, automatically re-reading styles when switching skins, and persists its settings. After installation, restart the DSH web client to enable it, offering users a lightweight solution to optimize the reading experience without modifying the skin source code.