dsh-git-branch-manage: Display and Manage Git Branches in DeepSeek Harness

`dsh-git-branch-manage` is a DeepSeek Harness (DSH) plugin developed by LongSir0419, designed to address the challenge developers face when frequently switching Git branches and having to leave the interface. The plugin integrates Git status into the session header and displays a “Git branch badge.” Core features include: left-clicking the badge to view local and remote branch lists in an IDEA-style tree structure; right-clicking to quickly perform branch switching, pulling, and pushing; supporting the creation of new branches with prefix suggestions; and enabling safe deletion of local branches. Confirmation prompts are shown before operations, and loading animations are displayed during execution. The plugin is easy to install and suitable for developers who need to manage code efficiently within the DSH interface.