dsh-docker: Docker and MCP Gateway Management Plugin for DeepSeek Harness Web

The `dsh-docker` plugin for DeepSeek Harness (DSH) unifies Docker and MCP Gateway management into a web-based interface, eliminating the cumbersome nature of CLI operations. It supports seamless switching between local and SSH remote hosts, with features including full lifecycle management of containers and images, MCP deployment, an interactive terminal, and command injection protection. Configuration is handled via environment variables or local files, and credentials are encrypted using DPAPI to ensure security.