dsh-memory-search-plus: DeepSeek Harness Cross-Session Full-Text Search Plugin

`dsh-memory-search-plus` is a standalone web plugin developed specifically for DeepSeek Harness (DSH), designed to address the difficulty of searching through large volumes of historical conversations. The plugin uses SQLite FTS5 to build a local full-text index, supporting cross-session searching, Chinese word segmentation, and message-level location. Users can access it quickly via a sidebar or keyboard shortcuts. The interface style is similar to ChatGPT/VSCode, and the plugin runs entirely locally with no network calls or telemetry, ensuring data security and privacy.