Find DSH plugin in proxy

Key features

• A plugin that finds plugins — think /find-skills from skills.sh, for DSH.
• Live GitHub repository search scoped to the official dsh-plugin topic, re-ranked by stars (5-minute per-query cache, anonymous API).
• When a result is also listed on awesome-dsh-plugin, its hand-written bilingual description from plugins.json replaces the GitHub one (the lang parameter picks the language) — ranking is untouched.
• Every result comes with a ready-to-run dsh plugin add command.
• Plugins are third-party code — review the source and pin a commit.