dsh-whale-bg: DeepSeek Harness Particle Whale Background Plugin

`dsh-whale-bg` is an unofficial DeepSeek Harness plugin maintained by gooosie. It uses a particle system to reconstruct a fish-shaped silhouette into a dynamic cluster, featuring entry assembly, idle swimming, mouse-interaction thrust, flashlight lighting effects, and 30FPS rendering. Installation requires adding the plugin to the `web` configuration file via the CLI. As a community project, it relies on MIT-licensed geometry data and is only compatible with specific versions of DSH.