typings: add comments to clarify user roles in UserRole enum

typings/src/user.ts

@@ -5,8 +5,11 @@ export interface User {
 }
 
 export const enum UserRole {
+	// Represents a user with administrative privileges
 	ADMIN = 'admin',
+	// Represents a regular user with standard access
 	USER = 'user',
+	// Represents a user who accesses the application via an API key
 	APP = 'app',
 }