dsh-tavily-pool: Tavily-Powered DeepSeek Harness Multi-Key Search Plugin

The DeepSeek Harness plugin `dsh-tavily-pool` addresses rate-limiting issues caused by relying on a single API key for search. Built on Tavily, it ensures high availability for search and scraping through multi-key pool management, balance-aware rotation, and automatic failover. Its core features include bulk key management, call monitoring, and standalone toggles, with support for plain-text scraping and parameter configuration. It is easy to install, has no runtime dependencies, and is suitable for developers who require high-concurrency search capabilities.