dsh-wechat-channel: WeChat Official Account Channel Plugin

`dsh-wechat-channel` is a WeChat plugin designed for DeepSeek Harness, intended to solve the challenge of remotely controlling Harness from mobile devices. This plugin allows users to send commands through a WeChat Official Account to control Harness and push execution results back to WeChat. Its core features include command control, result notification, security verification, and independent routing. Installation requires npm and configuration of `cordis.patch.yml`, and it must meet the requirement for a public HTTPS callback. For networks in mainland China, a Cloudflare HTTP/2 protocol tunnel is recommended. On first use, the user must obtain their `openid` through a customer service message and add it to the whitelist. The plugin includes a signature verification mechanism to ensure security.