feat: install ultra-message package via Composer path

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

config/ultra-message.php

@@ -0,0 +1,10 @@
+<?php
+
+return [
+    'instance_id'    => env('ULTRAMSG_INSTANCE_ID'),
+    'token'          => env('ULTRAMSG_TOKEN'),
+    'webhook_secret' => env('ULTRAMSG_WEBHOOK_SECRET', null),
+    'webhook_path'   => env('ULTRAMSG_WEBHOOK_PATH', 'ultra-message/webhook'),
+    'timeout'        => env('ULTRAMSG_TIMEOUT', 30),
+    'enabled'        => env('ULTRAMSG_ENABLED', true),
+];