@lijian-ui/dsh-im-gateway: Integrating DingTalk, QQ, and Personal WeChat Channels for dsh

`@lijian-ui/dsh-im-gateway` is an IM gateway plugin designed for DeepSeek Harness (dsh), aiming to unify access to DingTalk, QQ, and personal WeChat, resolving the adaptation challenges caused by protocol differences across channels. This plugin provides core capabilities through `ctx.imGateway`, including QR code binding, streaming replies, tool approval bridging, interactive question bridging, automatic fragmentation of long texts, merging of multi-segment inputs, and a bilingual interface. It supports independent credential configuration for multiple bot instances and allows handling approvals (default 120-second timeout) and user questions (default 600-second timeout) directly within IM, falling back to the native system after timeout. Installation only requires running `dsh plugin --profile web add @lijian-ui/dsh-`