dsh-copy-pick: Copybook Selection

`dsh-copy-pick` is an open-source plugin for DeepSeek Harness (DSH), maintained by user uckkk, focusing on calligraphy copybook selection. The plugin is categorized as "Fun Dress-Up," licensed under the MIT License, implemented in pure Node.js, and does not rely on network requests. The installation command is `dsh plugin add github:uckkk/dsh-copy-pick`; after installation, it can invoke its registered tool in a session to return a calligraphy study plan based on the provided parameters.