dsh-charge-time: Charging Time Estimation Plugin

`dsh-charge-time` is a pure Node.js tool plugin maintained by uckkk, designed to provide precise charging-time estimation for DeepSeek Harness (DSH). The plugin is based on online data, has no network dependency at runtime, and is suitable for invocation as a tool in DSH sessions. Installation requires the environment dependencies `@deepseek-ai/cordis` ^4.0.1 and `@deepseek-ai/dsh-tools` >=0.1.0-rc.6. Users can add the plugin using the official command. After installation, it automatically registers the `charge_time` tool, supporting precise calculations based on parameters. The plugin runs with the permissions of the current process, follows the MIT license, and is suitable for physical calculations or specific estimation logic.