There are too many files in `models/migrations` folder so that I split them into sub folders.
* Added properties for packages. * Fixed authenticate header format. * Added _catalog endpoint. * Check owner visibility. * Extracted condition. * Added test for _catalog. Co-authored-by: 6543 <6543@obermui.de> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com> Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>