prts-terrarchive: DeepSeek Harness Data Retrieval Plugin

`prts-terrarchive` is a memory plugin for DeepSeek Harness, designed to provide agents with local original-text and archive retrieval for Arknights and Arknights: Endfield. The plugin supports original text reading with line numbers, activity timeline queries, cloud hybrid retrieval, and interaction with the Rhine Life Archives. Installation requires DSH version >= 0.1.2-alpha.2; after installation, the relevant tools are invoked through PRTS mode, and the corpus data must be downloaded separately.