dsh-plugin-inventory-groups: Display Official and Self-Installed Plugins Separately

The DeepSeek Harness plugin `dsh-plugin-inventory-groups` divides the official default mixed plugin list into “User-Installed Plugins” and “Official Plugins” groups. It achieves interface separation via a Cordis bundle patch without modifying source code. After installation and restart, users can quickly locate and manage third-party plugins in the plugin list, improving retrieval efficiency. It is effective only on the Web platform.