feat: add Role (owner|admin) to the user domain, persistence model and mapper

test/user_display_name_test.go

@@ -20,7 +20,7 @@ import (
 	"github.com/go-chi/jwtauth/v5"
 )
 
-var displayNameResponseKeys = []string{"id", "username", "email", "is_verified", "created_at", "updated_at", "display_name"}
+var displayNameResponseKeys = []string{"id", "username", "email", "is_verified", "created_at", "updated_at", "display_name", "role"}
 
 func newDisplayNameRouter(userRepo *mockUserRepo, token *jwtauth.JWTAuth) *chi.Mux {
 	hasher := &stubHasher{}