Move package settings to package instead of being tied to version (#37026)

Unties settings page from package version and adds button to delete the
package version
Settings page now allows for deletion of entire package and it's
versions as opposed to a single version

Adds an API endpoint to delete the entire package with all versions from
registry

fixes: https://github.com/go-gitea/gitea/issues/36904

Co-Authored-By: gemini-3-flash

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>

routers/api/v1/api.go

@@ -1578,10 +1578,11 @@ func Routes() *web.Router {
 		m.Group("/packages/{username}", func() {
 			m.Group("/{type}/{name}", func() {
 				m.Get("/", packages.ListPackageVersions)
+				m.Delete("", reqPackageAccess(perm.AccessModeWrite), packages.DeletePackage)
 
 				m.Group("/{version}", func() {
 					m.Get("", packages.GetPackage)
-					m.Delete("", reqPackageAccess(perm.AccessModeWrite), packages.DeletePackage)
+					m.Delete("", reqPackageAccess(perm.AccessModeWrite), packages.DeletePackageVersion)
 					m.Get("/files", packages.ListPackageFiles)
 				})