dsh-gal2l: Gallons to Liters Plugin

DeepSeek Harness (DSH) introduces the plugin `dsh-gal2l` for agents or robots to handle volume conversions between gallons and liters locally. Maintained by uckkk, it features a pure Node implementation, no network dependencies, and a lightweight design. Install it using the command `dsh plugin add github:uckkk/dsh-gal2l`, with dependencies on relevant DSH core libraries. It is suitable for liquid-volume calculation scenarios, emphasizes safety precautions, and is appropriate to integrate as a basic tool.