dsh-pi-tui: DeepSeek Harness pi TUI terminal frontend

dsh-pi-tui is a DSH plugin based on the MIT license, designed to provide a high-performance interactive terminal frontend for the DSH Agent. This plugin combines the interface interaction capabilities of pi TUI with the official DSH kernel mechanisms, addressing the complex requirements of terminal frontends in handling streaming text, tool calls, session recovery, and permission approval. Its core features include streaming Markdown rendering, collapsible Thinking blocks, tool call status cards (including parameter and result previews), code diff highlighting, and inline image display within the terminal. Additionally, it supports Slash command auto-completion, permission approval popups, complex session management (creation, recovery, Fork, sub-agent trees), and transcript search. Users can optimize their operational experience through commands such as `/retry` and `/copy`, and the status bar then...