add: mailers to admins to update openai key

app/mailers/administrator_notifications/integrations_notification_mailer.rb

@@ -9,4 +9,10 @@ class AdministratorNotifications::IntegrationsNotificationMailer < Administrator
     subject = 'Your Dialogflow integration was disconnected'
     send_notification(subject)
   end
+
+  def openai_disconnect
+    subject = 'Your OpenAI integration needs attention'
+    action_url = settings_url('integrations/openai')
+    send_notification(subject, action_url: action_url)
+  end
 end

app/views/mailers/administrator_notifications/integrations_notification_mailer/openai_disconnect.liquid

@@ -0,0 +1,9 @@
+<p>Hello,</p>
+
+<p>Your OpenAI integration needs attention. This could be due to an expired or invalid API key, or your OpenAI credit balance may be exhausted.</p>
+
+<p>To continue using AI features, please update your API key in the integration settings.</p>
+
+<p>
+Click <a href="{{action_url}}">here</a> to update your API key.
+</p>