dsh-consumer-loan: Consumer Loan Monthly Payment Calculator

`dsh-consumer-loan` is a pure Node.js plugin designed specifically for DeepSeek Harness to calculate consumer loan monthly payments. It requires no internet connection, enables precise local execution of financial calculations, and significantly improves agent response speed. After installation using the specified commands, users can invoke the `consumer_loan` tool to perform operations. During use, they should inspect the source code and ensure that environment dependencies are met.