dsh-talebook-plugin: Talebook Secure Operations Plugin for DeepSeek Harness

`dsh-talebook-plugin` is a Talebook management plugin designed specifically for DeepSeek Harness (DSH), aiming to reduce API call risks through secure integration. The plugin integrates 12 functional tools—covering sites, books, audiobooks, book sources, and administrator features—into DSH, providing structured API access. It includes built-in credential management and approval mechanisms, supporting direct execution for read-only operations while requiring user confirmation for sensitive operations, ensuring that sensitive information is not exposed to models. Users can configure connection settings via the UI or environment variables, enabling secure and controllable library management.