dsh-inventory-turnover: Inventory Turnover Calculation Plugin

`dsh-inventory-turnover` is a lightweight plugin within the DeepSeek Harness (DSH) ecosystem, designed to meet the need for agents to process inventory business logic locally. Maintained by uckkk, it implements its core functionality with pure Node.js, supports precise calculation of inventory turnover rates, and has no reliance on external network services. To install the plugin, simply run `dsh plugin add github:uckkk/dsh-inventory-turnover`. Once installed, the tool can be invoked directly in DSH sessions to perform calculations. It is suitable for scenarios with stringent requirements for calculation speed and network conditions, and it is open-sourced under the MIT License.