dsh-tool-kit: Household Tool List Plugin

The DeepSeek Harness (DSH) plugin dsh-tool-kit focuses on household tool management, offering tool inventory and repair guide queries. Licensed under the MIT license and maintained by uckkk, it has no network dependencies and runs with the current process permissions. Developers can install it using the `dsh plugin add` command, then invoke the `tool_kit` tool directly in a session to use it.