dsh-tui: Terminal Interface for DeepSeek Harness

`dsh-tui` is the open-source terminal frontend of DeepSeek Harness (DSH), designed as a plugin to extend the interactive capabilities of DSH. It features a status bar displaying session ID, model status, and statistics, and supports managing LLM providers and Agent presets via `/model` and `/presets`. Core functionalities include real-time display of tool calls and reasoning processes, support for switching permission presets with `Shift+Tab`, and handling approval and planning modes. Users can manage goals using `/plan` and `/goal`, compress history with `/compact`, execute local shell commands with `!`, and reference repository files with `@`. Input supports Readline-style editing and history recall. Installation requires Node 22.19+ and AP.