dsh-optimize: DeepSeek Harness Long-Session Resource Manager

`dsh-optimize` is a long-session resource management plugin for DeepSeek Harness, designed to address issues caused by conversations growing over time, such as repeated transmission of history, rapidly increasing context costs, and web UI rendering lag. The plugin provides context load measurement, session state logging, automatic compaction (disabled by default), and browser view optimization (Lite rendering mode). It helps users manage resource usage by accurately tracking token consumption, and improves the interaction smoothness of long-conversation interfaces using CSS techniques.