DeepSeek Harness Plugin: dsh-order-threshold for Threshold-Based Discounts

The `dsh-order-threshold` plugin for DeepSeek Harness (DSH) is designed to address numerical calculation needs in conversational agent development. Maintained by `uckkk`, it focuses on quickly processing add-on order threshold discount calculations. Implemented purely in Node.js, it supports precise calculations based on parameters and returns detailed results, running efficiently without an internet connection. Users can install it using the official command and invoke the tool directly within a conversation, making it suitable for scenarios that require immediate amount calculations in the dialogue flow.