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/AfterDue.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace App\Enums;
+
+enum AfterDue: string
+{
+    case Keep = 'keep';
+    case Expire = 'expire';
+}