dsh-zhushou: DSH Sidebar Assistant Plugin

`dsh-zhushou` is a sidebar plugin for DeepSeek Harness (DSH), designed around the principle of “everything is a plugin.” It addresses the pain point of frequently switching assistant personas across multiple scenarios. The plugin allows users to manage assistant personas in the sidebar and directly apply a selected persona in the main DSH chat session; if none is selected, the session remains in its native state. Its core capabilities include session-level activation, independent model parameter configuration, templated system prompts, worldbook injection, memory management, and quick replies. Data is stored in a local directory. Install it via npm and restart DSH Web to start using it, providing a lightweight solution for persona reuse and role simulation.