Get notification settings
Retrieve all notification settings for a user, organized by category (app and email notifications).
Authorizations
Auth0-issued access token that includes the scopes listed for the endpoint.
Headers
MongoDB identifier of the user whose notification settings are being accessed or modified.
^[a-f0-9]{24}$"507f1f77bcf86cd799439011"
Response
Notification settings retrieved successfully
Complete notification settings for a user, organized by notification type (app/email) and category.
Both app and email are optional in the schema for flexibility, but in practice they will always
be present since notification settings are created during user creation.
Category names, notification names, and descriptions are localised based on the user's language preference.