DeepSeek Harness (DSH) Model Routing Plugin

`welsione/dsh-model-router` is a DeepSeek Harness (DSH) plugin built on the “everything is a plugin” design, intended to unify management of logical model IDs across multiple providers. It aggregates multiple candidate models into a single logical entry point and supports three-tier prioritization, first-token automatic failover, and health-based best-model selection. The plugin offers multi-plan routing, intelligent cooldown, thinking-level configuration, an admin panel, and bilingual support. After installation, users can configure models centrally in DSH settings; the plugin automatically persists the configuration and ensures safe runtime operation, effectively reducing the complexity of multi-provider model invocations.