dsh-universe-api: Offline API Discovery Tool

`dsh-universe-api` is an offline API discovery plugin for DeepSeek Harness (DSH). It registers the `universe_api_search` tool, enabling deterministic search across 1,693 normalized public API records. The plugin supports offline retrieval, multilingual matching, and hard filtering (such as authentication, HTTPS, and CORS), and provides stable ranking. Users can filter APIs using natural language or parameters; however, this tool is only a discovery mechanism and does not perform network requests or invoke APIs, so users must verify specific services themselves.