dsh-valuz-genui: Enable the model to generate interactive UI in DSH chat

`dsh-valuz-genui` is a DeepSeek Harness Web client plugin (MIT licensed) developed by valuz-ai, designed to address the issue of models outputting structured interfaces (such as charts, KPIs, tables, and dashboards) in DSH scenarios. Its core functionality is the provision of the `generate_ui` tool, which allows the model to directly generate A2UI v0.9.1 documents in a single turn, which are then immediately rendered by the browser into an interactive interface within the chat, without the need for nested model calls or additional front-end parsing. The plugin supports streaming generation, displaying the UI in real-time as the model outputs; user interactions (such as clicks or submissions) are fed back to the model as messages, enabling dynamic updates. Generated documents undergo validation and persistence, support reloading and replay, and discard illegal components to prevent total failure. The plugin operates via syste...