feat: 新增 Velocity 支持

src/main/java/cn/hamster3/service/velocity/event/MessageEvent.java

@@ -0,0 +1,20 @@
+package cn.hamster3.service.velocity.event;
+
+import cn.hamster3.service.common.entity.ServiceMessageInfo;
+
+/**
+ * 服务消息事件的基类
+ */
+@SuppressWarnings("unused")
+public class MessageEvent {
+    private final ServiceMessageInfo messageInfo;
+
+    public MessageEvent(ServiceMessageInfo messageInfo) {
+        this.messageInfo = messageInfo;
+    }
+
+    public ServiceMessageInfo getMessageInfo() {
+        return messageInfo;
+    }
+
+}