dsh-cache-hit-decimal: DeepSeek Harness Web Cache Hit Rate Decimalization Plugin

The DeepSeek Harness (DSH) Web GUI displays integer cache hit rates by default. This plugin uses Shadow DOM to override the `stats` cell, converts integers to two decimal places, and adapts to specific version environments. It supports source-based builds and installation, but maintenance has been discontinued since 2026. As the official client now includes this feature, using the default display is recommended.