fixup unused functions/vars

pkg/appview/middleware/registry_test.go

@@ -45,12 +45,6 @@ func (m *mockNamespace) BlobStatter() distribution.BlobStatter {
 	return nil
 }
 
-// mockRepository is a minimal mock implementation
-type mockRepository struct {
-	distribution.Repository
-	name string
-}
-
 func TestSetGlobalRefresher(t *testing.T) {
 	// Test that SetGlobalRefresher doesn't panic
 	SetGlobalRefresher(nil)