fix: 接通服务器V2排序链路

- 将排序参数从V2 Handler传递至Service与Repository

- 增加仓储分页排序与参数白名单测试

backend/controller/server_v2.go

@@ -57,7 +57,9 @@ func (h *ServerHandlerV2) ListServers(c *gin.Context) {
 	status := c.Query("status")
 	regionID := c.Query("region_id")
 
-	list, total, err := h.svc.ListServers(query.Keyword, status, regionID, query.Page, query.PageSize)
+	list, total, err := h.svc.ListServers(
+		query.Keyword, status, regionID, query.Sort, query.Order, query.Page, query.PageSize,
+	)
 	if err != nil {
 		utils.InternalError(c, "查询失败")
 		return