dsh-compose: DeepSeek Harness Composition Rules Plugin

The `uckkk/dsh-compose` plugin for DeepSeek Harness (DSH) aims to provide photography composition suggestions to models. It is developed in pure Node.js, does not depend on the network, and supports offline operation. Specific dependencies are required before installation, and the tool can be invoked directly after installation to obtain composition suggestions. The plugin is licensed under the MIT License, and users are advised to review the source code before installation to ensure security.