dsh-dashboard-ai: AI Universal Dashboard Plugin

The `dsh-dashboard-ai` plugin in DeepSeek Harness (DSH) is built on the “everything is a plugin” philosophy and aims to automate data dashboard construction with AI, addressing the time-consuming and error-prone nature of traditional manual configuration. Its core capabilities include automatically reading databases and selecting chart types, auto-populating layouts, and supporting detail-level drill-down viewing, with features such as Feishu-style design and offline operation. Users only need to issue natural language commands to generate interactive data analysis dashboards. Its ideal counterpart is the `data-model-builder` Skill, which builds the data model, while the plugin converts it into a visual dashboard.