* 🐛 Fixed the issue where WebSocket broadcast was used before initialization was complete
修复 WebSocket 广播未初始化完成即使用的问题
* 🎨 Improved broadcast-related APIs
改进广播相关 API
* 🎨 Add API for broadcast
* 🎨 Add API `/api/broadcast/getListenerCount`
* 🎨 Add API GET `/api/broadcast/channels`
* 🎨 Add API POST `/api/broadcast/getChannelInfo`
* Update broadcast.go
* Update broadcast.go