dsh-git-component: Add a Git panel to DeepSeek Harness WebUI

# Introduction When working with the DeepSeek Harness (DSH) WebUI, checking what has changed in the current repository, committing, and pushing usually requires switching back to the terminal to run `git status` and `git commit`. This back-and-forth often interrupts your current tasks. The dsh-git-component plugin solves this problem: it mounts a floating panel on the right side of the WebUI to display workspace changes in real-time. Commits and pushes can be completed directly within the panel, and if the commit message is left blank, it will be automatically generated. Below, we introduce the positioning, features, installation, and usage of this plugin. # What is this? dsh-git-component is a Git plugin for the DeepSeek Harness Web GUI, created by nieyun...