dsh-freeroute: DeepSeek Harness Free Model Aggregation Plugin

dsh-freeroute is a plugin for DeepSeek Harness that aims to address the instability of a single upstream by aggregating multiple free model providers. It supports transparent failover, multi-key rotation, failure visibility, and privacy protection. Users can call `freeroute/auto` via its OpenAI-compatible endpoint (default port 3080) to perform automatic model selection, effectively reducing inference costs.