dsh-free-models-hub: DeepSeek Harness Free Models Leaderboard Plugin

`dsh-free-models-hub` is a community plugin for DeepSeek Harness, designed to simplify the configuration process for free models. It provides a model leaderboard on the right side of the DSH interface and supports one-click or batch provider configuration. Users only need to apply for and paste an API key in the panel; the plugin then securely transmits it through the official credentials channel, eliminating manual edits to configuration files. Additionally, it offers a local multi-key rotation proxy that automatically handles key expiration and failover. The installation command is `dsh plugin --profile web add dsh-free-models-hub`, and Node.js >= 18 is required in the environment.