docs(site): fix strict-build doc links

- replace broken mirrored README asset links with GitHub URLs
- keep mkdocs strict build passing after the README refresh

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

plugins/filters/async-context-compression/README.md

@@ -158,6 +158,6 @@ If this plugin has been useful, a star on [OpenWebUI Extensions](https://github.
 
 ## Changelog
 
-See [`v1.5.0` Release Notes](./v1.5.0.md) for the release-specific summary.
+See [`v1.5.0` Release Notes](https://github.com/Fu-Jie/openwebui-extensions/blob/main/plugins/filters/async-context-compression/v1.5.0.md) for the release-specific summary.
 
 See the full history on GitHub: [OpenWebUI Extensions](https://github.com/Fu-Jie/openwebui-extensions)

plugins/filters/async-context-compression/README_CN.md

@@ -196,6 +196,6 @@ flowchart TD
 
 ## 更新日志
 
-请查看 [`v1.5.0` 版本发布说明](./v1.5.0_CN.md) 获取本次版本的独立发布摘要。
+请查看 [`v1.5.0` 版本发布说明](https://github.com/Fu-Jie/openwebui-extensions/blob/main/plugins/filters/async-context-compression/v1.5.0_CN.md) 获取本次版本的独立发布摘要。
 
 完整历史请查看 GitHub 项目： [OpenWebUI Extensions](https://github.com/Fu-Jie/openwebui-extensions)

plugins/filters/folder-memory/README.md

@@ -60,7 +60,7 @@ If this plugin has been useful, a star on [OpenWebUI Extensions](https://github.
 
 ## 🗺️ Roadmap
 
-See [ROADMAP.md](./ROADMAP.md) for future plans, including "Project Knowledge" collection.
+See [ROADMAP.md](https://github.com/Fu-Jie/openwebui-extensions/blob/main/plugins/filters/folder-memory/ROADMAP.md) for future plans, including "Project Knowledge" collection.
 
 ## Changelog
 

plugins/filters/folder-memory/README_CN.md

@@ -62,7 +62,7 @@
 
 ## 🗺️ 路线图
 
-查看 [ROADMAP.md](./ROADMAP.md) 了解未来计划，包括“项目知识”收集功能。
+查看 [ROADMAP.md](https://github.com/Fu-Jie/openwebui-extensions/blob/main/plugins/filters/folder-memory/ROADMAP.md) 了解未来计划，包括“项目知识”收集功能。
 
 ## 更新日志