dsh-insight: DeepSeek Harness Configuration Insights

dsh-insight is a read-only plugin that provides visual configuration insights for DeepSeek Harness (DSH). It addresses the difficulty of troubleshooting caused by fragmented configurations and complex logic by centrally displaying configuration hierarchy, source tracing, and runtime status in a dashboard. The plugin requires no process restart and provides a six-dimensional sorting feature. It is suitable for developers debugging configurations and resolving plugin conflicts, aiming to lower the barrier to configuration troubleshooting.