dsh-ui-agents-pixe: Add Work Role Tab and Pixel Office to DSH Web Main Window

dsh-ui-agents-pixe is an MIT-licensed plugin for the DSH ecosystem, maintained by EternalNight996, and requires Node.js 22 or higher. Without modifying the DSH source code, it adds a "Work Roles" tab and a "Pixel Office" floating layer to the main Web window. The plugin includes 508 Chinese and English character cards, supporting search, categorization, and team orchestration. The Pixel Office utilizes Canvas 2D technology to display interactive pixel characters, supporting drag-and-drop, zooming, and viewing full character cards. Core functions include agents_pixe_roles (on-demand character card retrieval) and agents_pixe_team (leader task decomposition, parallel execution by members, and result aggregation, with a member limit of 4-6). The plugin defaults to zero token consumption and is open source.