dsh-chatfile: Drag-and-Drop Upload of Any Files in the DSH WebUI

dsh-chatfile is an open-source plugin for DeepSeek Harness WebUI, designed to address the issue of agents being unable to handle regular files. It allows users to upload arbitrary files by dragging and dropping them or clicking a button. Uploaded files are persisted to the session's uploads directory, and their paths are automatically generated in the input box for the agent to read. The plugin features a 50MB per-file limit, a secure random-token download mechanism, and image compatibility. A service restart is required after installation for the changes to take effect.