docs: update README to reflect multi-agent platform branding

Author: phodal

README.md

@@ -3,8 +3,8 @@
 > **One Platform. All Phases. Every Device.**  
 > 统一平台·全开发阶段·跨全设备
 
-**AutoDev Xiuper** is the AI-native development platform built on Kotlin Multiplatform, covering all 7 phases of SDLC (
-Requirements → Development → Review → Testing → Data → Deployment → Operations) and supporting 8+ platforms (IDEA,
+**AutoDev Xiuper** is  the AI-native Multi-Agent development platform built on Kotlin Multiplatform, covering all 7 phases of
+SDLC (Requirements → Development → Review → Testing → Data → Deployment → Operations) and supporting 8+ platforms (IDEA,
 VSCode, CLI, Web, Desktop, Android, iOS, Server).
 
 ![ScreenShot](https://xiuper.com/screenshot.png)