Provide email notification capabilties

we have an internal notification system. we would need to add an admin setup for email notifications.

users would need configuration in their profile to opt into email notifications and select notification categories that they want to receive.

Start by locating the internal notification system and the existing admin and user-profile configuration entry points. Determine how email opt-in and notification categories should be represented, then identify the relevant tests or add coverage for administrator setup and user preferences. Done means admins can configure email notifications and users can opt in and select categories.

Written by the indexing model from the issue text.