Use turtle-ui to open the original TUI of DeepSeek Harness in the terminal

### 正式翻译（符合技术文档规范）： Turtle-UI is the original terminal UI extracted from DeepSeek Harness, provided as-is by turtle1999 under the BSD-3-Clause license. It is stacked on top of dsh-base as a dsh profile combination package, and is responsible for TTY rendering and input. This article verifies the installation command, the `--profile tui` usage and slash commands according to the directory page and GitHub, and points out the limitations such as the 404 status of `github:deepseek-harness/turtle-ui` and the unavailability of the in-app `/resume` handover function.