dsh-light-memory: Adding a lightweight, plain-text memory module to DSH Web GUI

dsh-light-memory is a DSH plugin developed by chidaic, providing a lightweight memory system for the DSH Web GUI. Instead of relying on databases, vector stores, or MCP, this plugin adopts four Markdown files—USER.md, PROJECT.md, WORKLOG.md, and CONVENTION.md—to store user preferences, project conventions, operation logs, and memory specifications, thereby achieving memory visibility, editability, and Git management. The core functionality revolves around two actions: append and distill. The former appends temporary operation records to the work log, while the latter precipitates conclusions into user or project memory files at task boundaries. The plugin offers four tool interfaces that support the injection of context through various means, such as systemPrompt, to work with prefixes.