dsh-rick: C-137 Skin for DeepSeek Harness

`dsh-rick` is a C-137-themed skin plugin for DeepSeek Harness (DSH), adding *Rick and Morty*–style scenes, posters, and interactive pets to the interface. The plugin supports custom scenes and directory posters, maintains configuration through `$DSH_HOME/settings.yaml`, renders overlay pets, and provides related routes. Users can install and enable it via commands, then activate it by selecting a poster in the Skin row. Typical usage includes clicking to trigger English quotes, launching portals, and triggering the pocket mechanism. Avoid conflicts with the built-in C-137 theme, and note that all quotes are in English. The plugin’s copyright belongs to the fans, and it is not an official product.