dsh-number-words: Convert Numbers to Words

`dsh-number-words` is a DeepSeek Harness plugin developed by uckkk that provides local conversion of numbers into formal Chinese numerals. It supports decimals and negative numbers, works offline, and is suitable for scenarios such as financial documents and invoices. Users can enable it by following the installation command and configuring `package.json`, then invoking the plugin tool to convert numbers. Please review the source code and license before installation.