dsh-plugin-text-translation: DSH Text and Document Translation Plugin

`dsh-plugin-text-translation` is a text translation plugin for the DeepSeek Harness (DSH), designed to address the issue that direct translation in game scripts and long document localization can easily damage format structures (such as color codes, variable placeholders, and subtitle timelines). This plugin does not replace the translation model but provides an "extract-assemble" capability: it inspects files via `inspect_text_file`, extracts text via `extract_text` while automatically masking and protecting tags and placeholders from RPG Maker, Unity, Ren'Py, and others, and finally restores the translation results losslessly into the original format via `assemble_text`. It supports Mtool JSON, Ren'Py, SRT/ASS/VTT subtitles, Gett