docs: 统一后端生态矩阵（补 FastAPI、修正坏链、统一 8 行顺序）

- 补齐 FastAPI、修正 youlai-thinkphp/youlai-rust 坏链

- 统一 8 行顺序：boot/nest/gin/django/fastapi/think/aspnet/axum

- 计数由七种改为八种后端

README.en-US.md

@@ -86,16 +86,17 @@
 
 | Project | Tech Stack | Description |
 |:-----|:-------|:-----|
-| [youlai-boot](https://gitee.com/youlaiorg/youlai-boot) | Spring Boot + MyBatis-Plus | Java Backend (Main) |
+| [youlai-boot](https://gitee.com/youlaiorg/youlai-boot) | Spring Boot 4 + MyBatis-Plus | Java (recommended) |
 | [youlai-nest](https://gitee.com/youlaiorg/youlai-nest) | NestJS + TypeORM | Node.js |
 | [youlai-gin](https://gitee.com/youlaiorg/youlai-gin) | Go + Gorm | Go |
 | [youlai-django](https://gitee.com/youlaiorg/youlai-django) | Django + DRF | Python |
+| [youlai-fastapi](https://gitee.com/youlaiorg/youlai-fastapi) | FastAPI + SQLAlchemy | Python |
 | [youlai-think](https://gitee.com/youlaiorg/youlai-think) | ThinkPHP 8 | PHP |
 | [youlai-aspnet](https://gitee.com/youlaiorg/youlai-aspnet) | ASP.NET Core | C# |
-
+| [youlai-axum](https://gitee.com/youlaiorg/youlai-axum) | Axum + SeaORM | Rust |
 > **youlai-boot** also provides variants: [Multi-tenant](https://gitee.com/youlaiorg/youlai-boot-tenant) · [MyBatis-Flex](https://gitee.com/youlaiorg/youlai-boot-flex) · [Spring Boot 3](https://gitee.com/youlaiorg/youlai-boot/tree/spring-boot-3) · [PostgreSQL](https://gitee.com/youlaiorg/youlai-boot/tree/db-pg) · [Multi-module](https://gitee.com/youlaiorg/youlai-boot/tree/multi-module)
 >
-> All six backends share the same **RESTful API** and **database schema**, frontends can switch seamlessly.
+> All eight backends share the same **RESTful API** and **database schema**, frontends can switch seamlessly.
 
 ## Development Guide
 

README.md

@@ -87,16 +87,18 @@
 
 | 项目 | 技术栈 | 说明 |
 |:-----|:-------|:-----|
-| [youlai-boot](https://gitee.com/youlaiorg/youlai-boot) | Spring Boot + MyBatis-Plus | Java 后端（主推） |
+| [youlai-boot](https://gitee.com/youlaiorg/youlai-boot) | Spring Boot 4 + MyBatis-Plus | Java（主推） |
 | [youlai-nest](https://gitee.com/youlaiorg/youlai-nest) | NestJS + TypeORM | Node.js |
 | [youlai-gin](https://gitee.com/youlaiorg/youlai-gin) | Go + Gorm | Go |
 | [youlai-django](https://gitee.com/youlaiorg/youlai-django) | Django + DRF | Python |
+| [youlai-fastapi](https://gitee.com/youlaiorg/youlai-fastapi) | FastAPI + SQLAlchemy | Python |
 | [youlai-think](https://gitee.com/youlaiorg/youlai-think) | ThinkPHP 8 | PHP |
 | [youlai-aspnet](https://gitee.com/youlaiorg/youlai-aspnet) | ASP.NET Core | C# |
+| [youlai-axum](https://gitee.com/youlaiorg/youlai-axum) | Axum + SeaORM | Rust |
 
 > **youlai-boot** 还提供以下变种和分支版本：[多租户](https://gitee.com/youlaiorg/youlai-boot-tenant)（Spring Boot 4）· [MyBatis-Flex](https://gitee.com/youlaiorg/youlai-boot-flex)（Spring Boot 4）· [Spring Boot 3](https://gitee.com/youlaiorg/youlai-boot/tree/spring-boot-3) · [PostgreSQL](https://gitee.com/youlaiorg/youlai-boot/tree/db-pg) · [多模块](https://gitee.com/youlaiorg/youlai-boot/tree/multi-module)
 >
-> 六种后端共享同一套 **RESTful API 规范** 和 **数据库结构**，前端可无缝切换。
+> 八种后端共享同一套 **RESTful API 规范** 和 **数据库结构**，前端可无缝切换。
 
 ## 开发指南
 
@@ -238,7 +240,7 @@ Thanks to all the contributors!
 <table align="center">
   <tr>
     <td align="center">
-      <img src="./public/images/qrcode/wechat-official.png" height="180" alt="公众号「有来技术」"><br>
+      <img src="./public/images/qrcode/wechat-official.jpg" height="180" alt="公众号「有来技术」"><br>
       <sub>公众号「有来技术」</sub>
     </td>
     <td>&nbsp;&nbsp;&nbsp;&nbsp;</td>