dsh-file-explorer-preview-molstar: Mol*-Based 3D Structure Preview Plugin

`dsh-file-explorer-preview-molstar` is a DSH Web plugin designed to provide interactive 3D visualization for biomolecular files such as `.cif` and `.pdb`, replacing the default text preview. Built on the Mol* technology stack, it supports multiple 3D representations and color schemes, interactive controls, and localization in Chinese and English, while also handling large files. It requires the `dsh-file-explorer` core plugin, is limited to read-only preview, and does not support trajectories or density maps.