dsh-feed-rule: Return Aquatic Care Plans Based on Parameters

`dsh-feed-rule` is an “Everything is a Plugin” aquarium care solution plugin for DeepSeek Harness (DSH). Built with pure Node.js, it calculates and returns feeding rules locally based on parameters without internet access, making it well suited to privacy- and stability-focused scenarios. Installation only requires running the specified command; after enabling, invoke the `feed_rule` tool to use it. Before use, note the environment dependencies and source-code security/license considerations.