fix npm Registry link

Author: wxiaoguang

routers/api/packages/npm/api.go

@@ -12,6 +12,7 @@ import (
 
 	packages_model "code.gitea.io/gitea/models/packages"
 	npm_module "code.gitea.io/gitea/modules/packages/npm"
+	"code.gitea.io/gitea/modules/setting"
 )
 
 func createPackageMetadataResponse(registryURL string, pds []*packages_model.PackageDescriptor) *npm_module.PackageMetadata {
@@ -98,7 +99,7 @@ func createPackageSearchResponse(pds []*packages_model.PackageDescriptor, total
 				Maintainers: []npm_module.User{}, // npm cli needs this field
 				Keywords:    metadata.Keywords,
 				Links: &npm_module.PackageSearchPackageLinks{
-					Registry: pd.VersionWebLink(), // TODO: is it right to use VersionWebLink here?
+					Registry: setting.AppURL + "api/packages/" + pd.Owner.Name + "/npm",
 					Homepage: metadata.ProjectURL,
 				},
 			},