feat: more role backend and admin/writer roles additions and adjustments

test/author_domain_test.go

@@ -127,7 +127,7 @@ func TestAuthorUseCases(t *testing.T) {
 		uc := useCases.NewUpdateAuthorUseCase(authors, users, newMockImageRepo(), discardRecorder)
 		bio := "x"
 
-		_, err := uc.Update(context.Background(), 2, useCases.AuthorCaller{UserID: 9, Role: "user"}, author.Patch{Bio: &bio})
+		_, err := uc.Update(context.Background(), 2, useCases.AuthorCaller{UserID: 9, Grants: authorsEditOwnGrants}, author.Patch{Bio: &bio})
 
 		if !errors.Is(err, author.ErrAuthorRights) {
 			t.Errorf("err = %v", err)