feat: install ultra-message package via Composer path

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

.env.example

@@ -63,3 +63,9 @@ AWS_BUCKET=
 AWS_USE_PATH_STYLE_ENDPOINT=false
 
 VITE_APP_NAME="${APP_NAME}"
+
+ULTRAMSG_INSTANCE_ID=
+ULTRAMSG_TOKEN=
+ULTRAMSG_WEBHOOK_SECRET=
+ULTRAMSG_WEBHOOK_PATH=ultra-message/webhook
+ULTRAMSG_ENABLED=true