docs: add group chat feature to README (#190)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -108,6 +108,17 @@ Unified configuration for **8 platforms** in one page:
 - Create directories
 - View file content with syntax highlighting
 
+### Group Chat
+
+- Multi-agent chat rooms with real-time messaging via Socket.IO
+- @mention routing — mention an agent to trigger a contextual reply
+- Context compression — automatic conversation summarization when history exceeds token threshold
+- Typing status and reply progress indicators
+- Room creation, deletion, and invite code management
+- Agent management — add/remove agents from rooms with per-agent profiles
+- SQLite message persistence
+- Mobile responsive with collapsible sidebar
+
 ### Skills & Memory
 
 - Browse and search installed skills

README_zh.md

@@ -109,6 +109,17 @@
 - 创建目录
 - 查看文件内容，支持语法高亮
 
+### 群聊
+
+- 多 Agent 聊天房间，通过 Socket.IO 实时通信
+- @提及路由 — 提及 Agent 触发上下文回复
+- 上下文压缩 — 历史消息超过 Token 阈值时自动摘要压缩
+- 输入状态和回复进度指示器
+- 房间创建、删除和邀请码管理
+- Agent 管理 — 添加/移除房间中的 Agent，支持独立 Profile
+- SQLite 消息持久化
+- 移动端响应式布局，可折叠侧边栏
+
 ### 技能与记忆
 
 - 浏览和搜索已安装的技能