dsh-annual-leave: Annual Leave Calculator

`dsh-annual-leave` is a DeepSeek Harness (DSH) plugin maintained by uckkk, designed to solve annual leave calculation issues. The plugin is implemented entirely in Node and supports precise calculations while returning detailed results. The installation command is `dsh plugin add github:uckkk/dsh-annual-leave`. Before use, confirm the dependency versions, and it is recommended to review the source code and license. This tool is suitable for scenarios that require quick integration of annual leave calculation functionality.