dsh-veg-pest: Pest and Disease Control Plugin

`dsh-veg-pest` is a Node.js plugin maintained by uckkk, designed specifically for DeepSeek Harness to provide locally generated plant disease and pest management solutions for gardening scenarios. The plugin registers the `veg_pest` tool and supports directly retrieving vegetable-growing plans by passing parameters. Before installation, the version requirements for `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools` must be met; it can be installed by running `dsh plugin add`. As a purely local implementation, it has no network dependencies, but note that it runs with the permissions of the current process, so please review the source code for security before installing.