dsh-run-config: Run Configuration Management for DeepSeek Harness

`dsh-run-config` is a plugin for DeepSeek Harness Web, designed to provide an IDE-like run control experience. It allows users to save frequently used Shell commands or LLM prompts as reusable task configurations, with support for both global and workspace scopes. Users can run a configuration with one click from the session header or new session page, and the LLM can also invoke relevant tools to manage configurations. The installation command is `dsh plugin --profile web add @xiaoso/dsh-run-config`.