dsh-morse: Morse Code Encoding and Decoding

`dsh-morse` is a local Morse code encoder/decoder plugin for DeepSeek Harness (DSH). Built with Node.js, it performs conversions locally without requiring an internet connection or relying on third-party services. Users can install it using the `dsh plugin add` command and invoke it directly within DSH sessions. It is suitable for development and debugging in offline environments. Note that it runs with the current process's permissions, so it is recommended to review its source code before use.