wpc0323/deepseek-web-import: Import chat.deepseek.com chat history as DSH sessions

`wpc0323/deepseek-web-import` is an MIT-licensed plugin for DeepSeek Harness (DSH) designed to import historical conversations from the web version of `chat.deepseek.com` into DSH official sessions. Upon installation, a new import page is added to the DSH settings panel. Users can retrieve the last 100 conversation history items by pasting the `userToken` copied from the browser's Local Storage (the plugin automatically extracts the `value` field) and then selecting a target workspace for import. Imported sessions retain their original titles, support model switching for continued conversation, and are stored persistently, remaining valid even after restarting DSH. Typical usage includes: navigating to the settings panel, saving the token, retrieving the conversation history, and selecting a workspace for import.