dsh-quick-phrases: Quick Phrases Above the Input Field and Slash-Triggered Menu

`dsh-quick-phrases` is a client plugin for DeepSeek Harness v0.7.5, designed to address the pain point of repeatedly typing the same phrases. Core features include clicking quick bars to insert text, triggering via the `/` menu, auto-send, drag-and-drop positioning, and local persistent storage. Data is stored in the `$DSH_HOME` directory and does not pollute session logs. Installation is straightforward, and it supports a management panel and JSON import/export. Note that editing across multiple windows may cause rollback conflicts.