Remove development branch from documentation (#546)

The development branch is no longer used. Update both English and Chinese
READMEs to remove references to it.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: JasonXuDeveloper

README.md

@@ -30,7 +30,6 @@ JEngine is a powerful Unity framework that enables **runtime hot updates** for y
 | `0.7.x` | 🔒 Legacy | Most popular 2022 version (no longer maintained) |
 | `0.6.x` | 🔒 Legacy | Complete with full documentation (no longer maintained) |
 | `0.5.x` | 🔒 Legacy | Used by some commercial projects (no longer maintained) |
-| `development` | 🔧 Development | Active development branch - PRs welcome! |
 
 ## 📦 Packages
 

README_zh_cn.md

@@ -34,7 +34,6 @@ JEngine是针对Unity开发者设计的**开箱即用**的框架，封装了强
 | `0.7.x` | 🔒 历史版本 | 2022年最热门版本（不再维护） |
 | `0.6.x` | 🔒 历史版本 | 内容完善，文档视频充足（不再维护） |
 | `0.5.x` | 🔒 历史版本 | 部分商业项目在使用（不再维护） |
-| `development` | 🔧 开发分支 | 活跃开发分支 - 欢迎PR！ |
 
 ## 📦 功能包