asakumizy/dsh-local-skills: Add local SKILL browsing page for DSH Web UI

`asakumizy/dsh-local-skills` is a Web UI plugin for DeepSeek Harness (DSH) designed to simplify the browsing and management of local SKILL files. The plugin supports identifying skill files in directory form (`<name>/SKILL.md`) and flat form (`<name>.md`), requiring files to contain YAML frontmatter and be named in kebab-case. Core features include listing skill names, descriptions, and applicable scenarios on the settings page, along with a "Use" button to retrieve and copy the invocation prompt. The plugin supports real-time monitoring of file changes via the `watch` configuration, with the interface automatically refreshing after new or modified skills are added. Installation is performed by specifying the path using the `dsh plugin` command followed by a restart.