feat: add invitation and promotion functions

api/store/vo/invite_log.go

@@ -0,0 +1,15 @@
+package vo
+
+import (
+	"chatplus/core/types"
+)
+
+type InviteLog struct {
+	Id         uint               `json:"id"`
+	InviterId  uint               `json:"inviter_id"`
+	UserId     uint               `json:"user_id"`
+	Username   string             `json:"username"`
+	InviteCode string             `json:"invite_code"`
+	Reward     types.InviteReward `json:"reward"`
+	CreatedAt  int64              `json:"created_at"`
+}