DSH Prompt Management Plugin: dsh-prompt-easymanager

`dsh-prompt-easymanager` is a DeepSeek Harness plugin maintained by XialerMoies, designed to address the challenge of fragmented prompt management. It supports managing prompts at both the global and session levels, allowing users to save and enable presets. It also provides standalone rewrite and preview features, ensuring that native DSH files remain unmodified. Users can install the plugin from GitHub by specifying a Profile. Data is stored under `$DSH_HOME`, so upgrades or uninstallation do not cause data loss. The plugin supports flexible deletion logic and instant reloading. Although the preview feature is temporarily disabled, it is suitable for users who frequently switch workflows.