fix(packages): Add label for private and internal package and fix composor package source permission check (#37610) (#37643)

Backport #37610 by @lunny

- Add permission checks for Composer package source links

- Add private/internal visibility labels for packages, similar to
repository visibility labels

<img width="969" height="571" alt="image"
src="https://github.com/user-attachments/assets/8a8ec3a0-bfbd-4dd6-b45b-58eda5db1a2d"
/>

- Add a link to change package visibility

<img width="1309" height="208" alt="image"
src="https://github.com/user-attachments/assets/3fa82b23-4c63-4a5e-b3f0-d37a103231ee"
/>

- Update link package descriptions

<img width="1308" height="265" alt="image"
src="https://github.com/user-attachments/assets/2c80b50e-5ffe-4d96-aedd-aa15964c4e05"
/>

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Nicolas <bircni@icloud.com>
Co-authored-by: silverwind <me@silverwind.io>

routers/api/packages/composer/api.go

@@ -9,7 +9,10 @@ import (
 	"time"
 
 	packages_model "code.gitea.io/gitea/models/packages"
+	access_model "code.gitea.io/gitea/models/perm/access"
+	"code.gitea.io/gitea/modules/log"
 	composer_module "code.gitea.io/gitea/modules/packages/composer"
+	"code.gitea.io/gitea/services/context"
 )
 
 // ServiceIndexResponse contains registry endpoints
@@ -91,7 +94,7 @@ type Source struct {
 	Reference string `json:"reference"`
 }
 
-func createPackageMetadataResponse(registryURL string, pds []*packages_model.PackageDescriptor) *PackageMetadataResponse {
+func createPackageMetadataResponse(ctx *context.Context, registryURL string, pds []*packages_model.PackageDescriptor) *PackageMetadataResponse {
 	versions := make([]*PackageVersionMetadata, 0, len(pds))
 
 	for _, pd := range pds {
@@ -116,10 +119,15 @@ func createPackageMetadataResponse(registryURL string, pds []*packages_model.Pac
 			},
 		}
 		if pd.Repository != nil {
-			pkg.Source = Source{
-				URL:       pd.Repository.HTMLURL(),
-				Type:      "git",
-				Reference: pd.Version.Version,
+			permission, err := access_model.GetDoerRepoPermission(ctx, pd.Repository, ctx.Doer)
+			if err != nil {
+				log.Error("GetDoerRepoPermission[%d]: %v", pd.Repository.ID, err)
+			} else if permission.HasAnyUnitAccessOrPublicAccess() {
+				pkg.Source = Source{
+					URL:       pd.Repository.HTMLURL(),
+					Type:      "git",
+					Reference: pd.Version.Version,
+				}
 			}
 		}
 

routers/api/packages/composer/composer.go

@@ -146,6 +146,7 @@ func PackageMetadata(ctx *context.Context) {
 	}
 
 	resp := createPackageMetadataResponse(
+		ctx,
 		setting.AppURL+"api/packages/"+ctx.Package.Owner.Name+"/composer",
 		pds,
 	)