feat: enums, schema and models for hado core

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BCrwHHnGCB5XH968Nxokqw

core/app/Enums/DeliveryResult.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Enums;
+
+enum DeliveryResult: string
+{
+    case Pending = 'pending';
+    case Ok = 'ok';
+    case Failed = 'failed';
+}