docs: add OOpenWebUI official newsletter featured recognition to Smart Mind Map, Markdown Normalizer, and Prompt Plus (#52)

* Initial plan

* docs: add OpenWebUI official newsletter featured recognition

- Add newsletter featured callout to Smart Mind Map README.md, README_CN.md, and docs
- Add newsletter featured callout to Markdown Normalizer README.md, README_CN.md, and docs
- Add newsletter featured badge to Prompt Plus in root README.md and README_CN.md
- Reference both newsletters: Jan 28, 2026 and Feb 3, 2026

Co-authored-by: Fu-Jie <33599649+Fu-Jie@users.noreply.github.com>

* docs: fix newsletter links to match actual featured issue per plugin

- Smart Mind Map: link only to Feb 3, 2026 (second newsletter)
- Markdown Normalizer: link only to Jan 28, 2026 (first newsletter)
- Prompt Plus (root READMEs): already correct, no change needed

Co-authored-by: Fu-Jie <33599649+Fu-Jie@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Fu-Jie <33599649+Fu-Jie@users.noreply.github.com>

plugins/actions/smart-mind-map/README.md

@@ -4,6 +4,8 @@ Smart Mind Map is a powerful OpenWebUI action plugin that intelligently analyzes
 
 **Author:** [Fu-Jie](https://github.com/Fu-Jie) | **Version:** 1.0.0 | **Project:** [OpenWebUI Extensions](https://github.com/Fu-Jie/openwebui-extensions) | **License:** MIT
 
+> 🏆 **Featured by OpenWebUI Official** — This plugin was recommended in the official OpenWebUI Community Newsletter: [February 3, 2026](https://openwebui.com/blog/open-webui-community-newsletter-february-3rd-2026)
+
 ## What's New in v1.0.0
 
 ### Direct Embed & UI Refinements

plugins/actions/smart-mind-map/README_CN.md

@@ -4,6 +4,8 @@
 
 **作者:** [Fu-Jie](https://github.com/Fu-Jie) | **版本:** 1.0.0 | **项目:** [OpenWebUI Extensions](https://github.com/Fu-Jie/openwebui-extensions) | **许可证:** MIT
 
+> 🏆 **OpenWebUI 官方推荐** — 本插件获得 OpenWebUI 社区 Newsletter 官方推荐：[2026 年 2 月 3 日](https://openwebui.com/blog/open-webui-community-newsletter-february-3rd-2026)
+
 ## v1.0.0 最新更新
 
 ### 嵌入式直出与 UI 细节全线重构