refactor: 项目目录重构

src/main/java/com/youlai/boot/system/event/UserConnectionEvent.java

@@ -0,0 +1,16 @@
+package com.youlai.boot.system.event;
+
+import lombok.Getter;
+import org.springframework.context.ApplicationEvent;
+
+@Getter
+public class UserConnectionEvent extends ApplicationEvent {
+    private final String username;
+    private final boolean connected;
+
+    public UserConnectionEvent(Object source, String username, boolean connected) {
+        super(source);
+        this.username = username;
+        this.connected = connected;
+    }
+}