ops 2

SSH ops and database tools for DSH Web UI: connect to remote servers via SSH terminal/SFTP/tunnels, and connect to MySQL/PostgreSQL/Redis/MongoDB databases. Host half manages sessions with ssh2; client half renders the terminal and database panel.

DeepSeek Harness 的简洁远程访问面板：准备 Tailscale 入口、检查就绪状态并生成本地访问二维码。