dsh-files-native: Near-Native Attachment Upload for DeepSeek Harness

dsh-files-native is a native attachment enhancement plugin for DeepSeek Harness (DSH), designed to address the limitations of official attachment interactions and improve file-operation efficiency. It supports drag-and-drop, paste, and multi-selection via the paperclip button, and uses a Loopback upload mechanism to enable mixed layouts of file cards and images. The plugin must be installed via command line and requires a process restart. It is compatible with DSH 0.1.5 and later versions. Usage is limited to a maximum file size of 50 MB per file and up to 20 files per batch, and it is not compatible with certain plugins.