xby-epub-template-server: Providing Epub360 Template Search Capability for AI Applications

`xby-epub-template-server` is a web-enabled tool plugin in the DeepSeek Harness (DSH) ecosystem, designed for agent integration. It addresses the inefficiency of developers manually retrieving EPUB360 templates and supports quickly locating and obtaining template lists using keywords. Its core functions include `set_xby_apikey`, which sets a persistent API key, and `search_templates`, which supports keyword-based search and limits the number of returned results. Users must first register on the official website to obtain an API key; after installation, the plugin can be invoked in DSH to automate template retrieval, allowing users to focus on application-level logic orchestration.