dsh-error-gloss: Add a line of Chinese explanation for DeepSeek Harness errors

The official DSH client only localizes 6 error codes, with the rest being passed through as-is in English. `dsh-error-gloss` is a client-side plugin that covers all official error codes using 40 entries (29 exact codes + 11 code families). Below the official error line, it adds a separate line with a Chinese title, description, impact, and recommendations, while fully preserving the original text and code. Causes are categorized into three levels: "Confirmed", "Possible", and "Unverified". If information is missing for the first two levels, it is marked as "Unverified" rather than fabricating an attribution. The plugin routes based on the code rather than parsing text, and all registration steps are wrapped in exception handling separately to avoid delaying the host's startup. The repository includes a pre-built bundle, eliminating the need for compilation or runtime dependencies. Installation supports installation via a plugin manager from GitHub or tarball, manual scripts, or a custom plugin market index source. The settings page allows viewing the version, entry count, hit count, and running self-tests. The dictionary is pure JSON and can be overridden by the user, with `causeAssertion` locked in one direction. The code is released under the MIT license, while the interface character assets are under CC BY-NC-SA 4.0; commercial use requires the removal of related assets. This project is not affiliated with DeepSeek.