dsh-credit-card-installment: Credit Card Installment Calculator Plugin

`dsh-credit-card-installment` is a DeepSeek Harness client plugin maintained by uckkk, designed to compute credit card installment plans locally. This pure Node.js tool requires no network requests, supports precise calculation based on parameters, and returns detailed results with explanations. Installation requires specific dependency versions, making it suitable for instantly obtaining installment information during conversations and for assisted calculations in offline environments.