dsh-objectid: ObjectId Generation Plugin

`dsh-objectid` is a plugin for DeepSeek Harness (DSH), maintained by uckkk, primarily used to generate MongoDB ObjectIds locally. Implemented in pure Node.js and without external network dependencies, it can quickly generate unique identifiers in environments where no database is available. The installation command is `dsh plugin add github:uckkk/dsh-objectid`. Since the plugin runs with the permissions of the current process, it is recommended to review the source code before installation. Once installed, the related tool can be invoked within a DSH session.