dsh-snowflake: Snowflake ID Generation Plugin for DeepSeek Harness

The `dsh-snowflake` plugin for DeepSeek Harness (DSH) is designed to meet the need for agents to generate globally unique IDs, following the "everything is a plugin" design philosophy. It is maintained by developer `uckkk`, is under the MIT License, and is a pure Node.js implementation with no network dependencies, allowing it to run directly locally. Its core function is to invoke the registered tool to generate unique IDs based on the Snowflake algorithm, making it especially suitable for scenarios with network isolation requirements. To install it, use the `dsh plugin add github:uckkk/dsh-snowflake` command and ensure that `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools` are installed in the environment.