DeepSeek Harness Plugin dsh-case: Naming Style Conversion Tool

`dsh-case` is a zero-dependency naming convention conversion plugin in the DeepSeek Harness ecosystem. By registering the `case_convert` tool, it supports conversion among multiple styles, including `camelCase`, `snake_case`, `PascalCase`, `kebab-case`, and `CONSTANT_CASE`. The plugin features smart tokenization, automatically recognizing case boundaries, number boundaries, and delimiter splits. When using it, specify `text` (the content to convert) and `target` (the target style); `source` is auto-detected by default. The return value includes the conversion result and the tokenized word list. It is maintained by ZhijiangTang, depends on specific peer dependency versions, and is available after installation.