dsh-user-prompt: DeepSeek Harness Custom Prompt Plugin

The DeepSeek Harness (DSH) plugin dsh-user-prompt provides developers with a convenient prompt management feature. It supports editing and injecting Markdown-formatted global prompts directly from the settings page, eliminating the need to manually paste repeated background information. It is compatible with Claude Code and Codex global rules, supports one-click import and export, and, as a purely additive plugin, does not affect official features. Once configured, the content is injected into conversations through the context channel, but you should avoid using DSH template variable syntax.