dsh-educoder: Fully Automated Plugin for EduCoder Assignments

`dsh-educoder` is a DeepSeek Harness (DSH) plugin for the Touge (EduCoder) platform, enabling zero-token scanning and assignment solving. The plugin uses the platform’s public APIs to scan all unfinished assignments, extracts multiple-choice answers from platform responses, calls the model only for programming questions, and submits real evaluations. It supports session caching, automatic re-login, and failure feedback localization, making it well suited for low-cost, high-efficiency automation scenarios.