feat(ticket): add refund transaction model

database/migrations/2026_09_14_010000_create_ticket_refunds_table.php

@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('ticket_refunds', function (Blueprint $table): void {
+            $table->id();
+            $table->foreignId('ticket_id')->unique()->constrained('tickets')->cascadeOnDelete();
+            $table->foreignId('purchase_item_id')->constrained('compra_items')->restrictOnDelete();
+            $table->foreignId('created_by_user_id')->nullable()->constrained('users')->nullOnDelete();
+            $table->string('type', 16);
+            $table->decimal('amount', 10, 2);
+            $table->timestamps();
+
+            $table->index(['purchase_item_id', 'type']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('ticket_refunds');
+    }
+};