dsh-effort-ultra: DeepSeek Harness Native Reasoning Effort Control

`dsh-effort-ultra` is a reasoning-effort control plugin designed exclusively for DeepSeek Harness (DSH). By calling the official DSH session service, it resolves the lack of native interface controls and conflicts with third-party controls, offering six adjustment levels (from Off to Ultra) and a blue-to-purple gradient interface. The plugin supports continuous sliding, explicit menus, model-switch synchronization, and theme adaptation. It directly reads the `reasoning` declaration in the official DSH directory to ensure accurate levels. Easy to install and highly compatible, it is an ideal tool for developers who want precise control over model outputs.