更新会员路由，修改createGuest方法以接受ref参数，替换原有的domain参数，确保路由与控制器逻辑一致。

src/routes/member.routes.ts

@@ -17,7 +17,7 @@ export default async function memberRoutes(fastify: FastifyInstance) {
   const memberController = new MemberController(fastify)
 
   // 创建游客
-  fastify.get<{ Querystring: { code?: string; domain?: string } }>(
+  fastify.get<{ Querystring: { code?: string; ref?: string } }>(
     '/guest',
     memberController.createGuest.bind(memberController)
   )