dsh-yeast-convert: Yeast Amount Calculator

`dsh-yeast-convert` is an online tool maintained by uckkk within the DeepSeek Harness plugin ecosystem, focused on addressing basic calculation needs in recipe development and fermentation control. The plugin provides a tool named `yeast_convert`; when invoked, numerical values can be passed as parameters to obtain detailed calculation results. It is implemented in pure Node.js, has no network dependencies at runtime, and requires no additional configuration. For developers who need to process fermentation data, this is a lightweight calculation helper tool.