dsh-lpr-convert: LPR Spread Conversion Tool

To address the LPR add-on conversion requirements encountered while developing DeepSeek Harness (DSH), developer uckkk has provided a lightweight, pure Node.js plugin solution. The plugin works without network access and can be installed and enabled via the command `dsh plugin add github:uckkk/dsh-lpr-convert`, allowing the agent to perform precise calculations locally. This effectively resolves the complexity of hard-coded rules and the privacy and latency risks associated with external APIs. Before use, it is recommended to review the source code to verify its logic.