feat：完善网站活动报名信息

app/event/activity.go

@@ -0,0 +1,17 @@
+package event
+
+import "SciencesServer/app/common/model"
+
+type ActivityJoin struct{}
+
+func (*ActivityJoin) Handle(arg ...interface{}) {
+	_ = model.Create(&model.ActivityJoin{
+		IdentityUID: arg[0].(uint64),
+		ActivityID:  arg[1].(uint64),
+		Status:      model.ActivityJoinStatusForSuccess,
+	})
+}
+
+func NewActivityJoin() *ActivityJoin {
+	return &ActivityJoin{}
+}