dsh-hydrogen: Hydrogen Element Data Query Plugin

`dsh-hydrogen` is a local plugin implemented purely in Node, designed to address the latency issue of fetching fixed structured data for hydrogen elements in DSH development. The plugin requires no network dependencies and is maintained and open-sourced by uckkk. It provides two interfaces: `element_info` (retrieve complete information) and `element_field` (query by field), supporting flexible data extraction. It is easy to install and simple to call, making it suitable for data display and complex business logic processing. Before use, ensure that `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools` meet the required version requirements.