dsh-cosmetics-shelf: Cosmetics Expiration Date Lookup

The DeepSeek Harness (DSH) plugin `uckkk/dsh-cosmetics-shelf` is a local tool implemented purely in Node.js, designed to provide agents with cosmetic shelf-life inquiry capabilities. The plugin requires no network dependencies. By registering the `cosmetics_shelf` tool, users can directly obtain clear shelf-life recommendations based on input parameters. It is licensed under the MIT License and is suitable for scenarios that require integrating cosmetic shelf-life inquiries into DSH agents.