dsh-llm-headers: Inject custom HTTP headers into DeepSeek Harness's LLM requests

# Introduction When deploying DeepSeek Harness (DSH) in an enterprise intranet, a common barrier arises: the egress gateway validates the request's `user-agent`, and requests lacking the specified brand text are rejected outright. However, DSH's LLM adapter forces the writing of its own attribution `user-agent`, which cannot be bypassed by simply modifying a field in the configuration file. `dsh-llm-headers` solves this problem: it is a DSH plugin that injects your configured request headers at the HTTP layer for requests sent to the LLM provider. Below is an introduction to its principles, installation methods, and typical usage. # What is dsh-llm-headers `dsh-llm-headers` is for Deep...