weread-export: Integrating WeRead Data into DeepSeek Harness

`weread-export` is a WeRead plugin for DeepSeek Harness that retrieves bookshelves, notes, and statistics via the official API and supports exporting them to flomo, local Markdown, or Notion. Users need to generate a key on the official WeRead website and configure it in DSH. The plugin provides bookshelf queries, note export, and various commands, addressing the challenges of fragmented WeRead data and unstable scraping.