dsh-multi-model-orchestrator: Turn the Main Model into a Multi-Model Scheduler

`dsh-multi-model-orchestrator` is a DeepSeek Harness (DSH) plugin designed to upgrade the main model into a multi-model orchestration center. Through system prompt injection and tool calling, it guides the main model to break down complex tasks and intelligently distribute them to submodels based on their characteristics, such as reasoning capability, cost, and speed. Users need to add third-party model routes in the configuration file and set model notes to define each model's strengths and weaknesses. The plugin supports token usage statistics by model and can handle parallel subtasks. To install it, add the plugin using the `dsh plugin` command; it takes effect after restarting Harness. When using it, users should be aware of considerations such as the process-accumulation behavior of token statistics, route type settings, and credential checks.