dynamic-schulte-dsh: A Schulte Grid plugin for the dsh Web UI to play while waiting for the model

`dynamic-schulte-dsh` is a waiting-time mini-game plugin for DSH, developed by marvin9551. It allows users to play the Schulte Grid within the Web UI while waiting for the model to respond during a DeepSeek Harness intelligent conversation, making use of fragmented time ranging from a few seconds to dozens of seconds. Adhering to the DSH philosophy of "Everything is a plugin," it is installed via `dsh plugin add`, registers a "Schulte" entry at the bottom of the Web UI sidebar, and features a breathing green dot indicator when the model is thinking. Core features include a classic n×n static grid (3×3 to 7×7), a rotating dynamic roulette wheel, waiting prompts, localStorage-based local persistence for history and settings, and optional number highlighting and color distraction enhancements. The architecture is split into two halves: the host part is a purely placeholder plugin.