dsh-router-traework: TRAE SOLO Vendor Plugin

`dsh-router-traework` is a TRAE SOLO provider plugin for DeepSeek Harness (DSH), providing free chat channel access. It requires DSH 0.2.0 or later. After installation, restart the application to use it from the panel. The plugin handles protocol processing, token refresh, and status reporting for a single account, but does not handle scheduling policies or persistent storage. Its features include handling error code 9074, skipping expired credits, and check-ins. This project is for study and research purposes only.