LoongPort DSH Plugin: Integrating an OpenAI-compatible Provider into DSH

`loongport` is a plugin and CLI tool for DeepSeek Harness (DSH) maintained by SailingLoong, designed to simplify the integration of OpenAI-compatible providers. This plugin (v0.2.0, MIT licensed, requires Node.js >= 20) primarily offers two functions: first, a visual configuration entry in DSH under "Settings → LoongPort," where users can select pre-verified providers, paste API keys, and choose models; and second, advanced CLI commands to write custom OpenAI-compatible endpoints into the DSH configuration. The CLI supports options such as `--base-url`, `--model`, and `--route`.