Integrate Enterprise WeChat WeDrive into DSH Input Bar: Introduction to the wecom-file-dsh Plugin

This introduces the DSH client plugin `wecom-file-dsh` maintained by Cillivian: it places an Enterprise WeChat Micro-disk selector in the conversation input bar, writes selected files, documents, or folders as official @ references (chips), and then passes them to the corresponding `wecom-cli` skill for processing based on the ID prefix. It defaults to using the local `wecom-cli`, falling back to the official selector if the CLI is unavailable. The article explains the difference between the package name `wecom-dsh-plugins` and the plugin ID `wecom-picker`, the `pnpm` installation command, the profile patch layer placement configuration, chip text rules, ID prefix routing table, host routing, and keyboard and window preferences. It also explains why the official iframe cannot be logged into in the desktop version, along with security boundaries and licensing restrictions.