docs: add Batch Install Plugins install section to plugin READMEs

docs/plugins/actions/flash-card.zh.md

@@ -8,6 +8,19 @@
 | ![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) |
 | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
 
+## 使用 Batch Install Plugins 安装
+
+如果你已经安装了 [Batch Install Plugins from GitHub](https://github.com/Fu-Jie/openwebui-extensions/tree/main/plugins/tools/batch-install-plugins)，可以用下面这句来安装或更新当前插件：
+
+```text
+从 Fu-Jie/openwebui-extensions 安装插件
+```
+
+当选择弹窗打开后，搜索当前插件，勾选后继续安装即可。
+
+> [!IMPORTANT]
+> 如果你已经安装了 OpenWebUI 官方社区里的同名版本，请先删除旧版本，否则重新安装时可能报错。删除后，Batch Install Plugins 后续就可以继续负责更新这个插件。
+
 ## 🔥 最新更新 v0.2.4
 
 * **输出优化**: 移除输出中的调试信息。