feat(copilot-sdk): v0.12.1 - disable terminal tools for AI, improve RichUI theme

- Disable terminal server tools from being exposed to AI
- Add RichUI theme-aware CSS variables for better text contrast
- Update version to 0.12.1 across all documentation files

docs/plugins/pipes/github-copilot-sdk.zh.md

@@ -1,6 +1,6 @@
 # GitHub Copilot Official SDK Pipe
 
-| 作者：[Fu-Jie](https://github.com/Fu-Jie) · v0.12.0 | [⭐ 点个 Star 支持项目](https://github.com/Fu-Jie/openwebui-extensions) |
+| 作者：[Fu-Jie](https://github.com/Fu-Jie) · v0.12.1 | [⭐ 点个 Star 支持项目](https://github.com/Fu-Jie/openwebui-extensions) |
 | :--- | ---: |
 
 | ![followers](https://img.shields.io/endpoint?url=https%3A%2F%2Fgist.githubusercontent.com%2FFu-Jie%2Fdb3d95687075a880af6f1fba76d679c6%2Fraw%2Fbadge_followers.json&label=%F0%9F%91%A5&style=flat) | ![points](https://img.shields.io/endpoint?url=https%3A%2F%2Fgist.githubusercontent.com%2FFu-Jie%2Fdb3d95687075a880af6f1fba76d679c6%2Fraw%2Fbadge_points.json&label=%E2%AD%90&style=flat) | ![top](https://img.shields.io/badge/%F0%9F%8F%86-Top%20%3C1%25-10b981?style=flat) | ![contributions](https://img.shields.io/endpoint?url=https%3A%2F%2Fgist.githubusercontent.com%2FFu-Jie%2Fdb3d95687075a880af6f1fba76d679c6%2Fraw%2Fbadge_contributions.json&label=%F0%9F%93%A6&style=flat) | ![downloads](https://img.shields.io/endpoint?url=https%3A%2F%2Fgist.githubusercontent.com%2FFu-Jie%2Fdb3d95687075a880af6f1fba76d679c6%2Fraw%2Fbadge_downloads.json&label=%E2%AC%87%EF%B8%8F&style=flat) | ![saves](https://img.shields.io/endpoint?url=https%3A%2F%2Fgist.githubusercontent.com%2FFu-Jie%2Fdb3d95687075a880af6f1fba76d679c6%2Fraw%2Fbadge_saves.json&label=%F0%9F%92%BE&style=flat) | ![views](https://img.shields.io/endpoint?url=https%3A%2F%2Fgist.githubusercontent.com%2FFu-Jie%2Fdb3d95687075a880af6f1fba76d679c6%2Fraw%2Fbadge_views.json&label=%F0%9F%91%81%EF%B8%8F&style=flat) |