cleanup: 移除调试代码和未使用的wstunnel下载

debug: echo received headers in response

refactor: 改用HTTP CONNECT代理替代wstunnel, 适配HF Space代理层

fix: 用路径(/health)区分健康检查, 避免HF代理丢弃Upgrade header

fix: 首包转发到wstunnel后端, shutdown延迟调用, macOS兼容

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remove unused files

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initial commit