dsh-paste-names: Enable DSH Web Input to support pasting and drag-and-drop of non-image files

# Introduction In the DSH (DeepSeek Harness) Web interface, referencing workspace files is limited to two default methods: manually typing `@` to select from a hierarchical menu, or dragging files directly into the input box. The former is time-consuming for locating deep files in large repositories, while the latter immediately triggers an error stating "Only images in PNG, JPG, WebP, or GIF formats are supported," rejecting any files or folders other than images. `dsh-paste-names` fills this gap: it parses pasted non-image files or folders into native DSH `@path` file references, and inserts absolute path text when dragging and dropping. The following sections introduce its features, implementation details, and installation instructions. # What is it? `dsh-paste-names` is a DSH Web plugin.