Fix model_name availability when using ActiveModel::Serialization

In v4.0.0, switching from `extend ActiveModel::Naming` to only `extend
ActiveModel::Translation` can cause "undefined method 'model_name'" errors
when ActiveHash models include ActiveModel::Serialization, particularly
with Rails 8.0+.

While ActiveModel::Translation includes ActiveModel::Naming internally,
the inclusion doesn't always properly expose the model_name class method
when extended. This breaks compatibility for models that depend on
model_name being available at the class level.

This commit explicitly extends both ActiveModel::Naming and
ActiveModel::Translation to ensure model_name is always available while
maintaining i18n support. This approach ensures compatibility across all
Rails versions.

Signed-off-by: moznion <[email protected]>

Author: moznion

lib/active_hash/base.rb

@@ -24,6 +24,7 @@ class Base
     class_attribute :_data, :dirty, :default_attributes, :scopes
 
     if Object.const_defined?(:ActiveModel)
+      extend ActiveModel::Naming
       extend ActiveModel::Translation
       include ActiveModel::Conversion
     else