Feature: Support for enumLabels in self-service action inputs

Use Case: Ability to show user-friendly display labels while passing technical keys/values to the backend

Example:

"enum": ["prod", "stg", "dev"],

"enumLabels": {

"prod": "Production Environment",

"stg": "Staging Environment",

"dev": "Development Environment"

}

Benefit: Improves UX by separating what users see from what the backend processes