Rebrand the entire application from "胡萝卜社区" (Carrot BBS) to "威友" (WithYou), including:

- Update app name, package name (skin.carrot.bbs → cn.qczlit.withyou), and bundle identifier
- Update API endpoints (bbs.littlelan.cn → withyou.littlelan.cn)
- Update URL scheme (carrotbbs:// → withyou://)
- Rename database from carrot_bbs to with_you
- Update CI/CD pipeline image names and artifact naming
- Add Android signing configuration for release builds
- Update all UI text and comments throughout the codebase
- Refactor registerStore to use in-memory state instead of AsyncStorage persistence
- Improve WebRTC track handling and call stream management
- Add metro platform resolution for native platform support

BREAKING app package, database, and URLs are no longer valid

src/screens/message/MessageListScreen.tsx

@@ -1,6 +1,6 @@
-/**
+/**
  * 消息列表页 MessageListScreen
- * 胡萝卜BBS - 消息列表
+ * 威友 - 消息列表
  * 
  * 【重构后】使用MessageManager架构
  * - 纯渲染组件，不直接管理数据