Refactor code structure for improved readability and maintainability

.env.example

@@ -62,8 +62,8 @@ EXTERNAL_ID_TIPO_NOTA=1
 MP_ACCESS_TOKEN=
 MP_PUBLIC_KEY=
 MP_WEBHOOK_SECRET=
-MP_BACK_URL_SUCCESS=https://learning.norteamericano.com/payments/success
-MP_BACK_URL_FAILURE=https://learning.norteamericano.com/payments/failure
+MP_BACK_URL_SUCCESS=https://${NEXT_PUBLIC_LEARNING_DOMAIN}/payments/success
+MP_BACK_URL_FAILURE=https://${NEXT_PUBLIC_LEARNING_DOMAIN}/payments/failure
 MP_NOTIFICATION_URL=
 
 # ----------------------------------------
@@ -85,6 +85,9 @@ LETSENCRYPT_STAGING=true
 
 # ----------------------------------------
 # Frontend URLs (para producción con SSL)
+# Dominios configurables - cambiar aquí para mover a otro dominio
 # ----------------------------------------
+NEXT_PUBLIC_STUDIO_DOMAIN=studio.norteamericano.com
+NEXT_PUBLIC_LEARNING_DOMAIN=learning.norteamericano.com
 NEXT_PUBLIC_CMS_API_URL=https://studio.norteamericano.com
 NEXT_PUBLIC_LMS_API_URL=https://learning.norteamericano.com