dsh-turn-tools: DeepSeek Harness Interaction Enhancement Plugin

The DSH Harness plugin `dsh-turn-tools` addresses the cumbersome file access and conversation navigation in the DeepSeek Harness web interface. By adding a file button at the end of each conversation turn, it allows generated files to be opened with one click. It also provides a dot navigation bar on the right side for quickly jumping to previous turns. Installation requires placing the code in the corresponding directory and restarting DSH. This plugin works when the agent generates files and implements its functionality by scanning DOM elements, significantly improving debugging efficiency.