feat(tickets): add source_purchase_id to tickets and update related logic

database/migrations/2026_07_28_000000_add_source_purchase_id_to_tickets_table.php

@@ -0,0 +1,27 @@
+<?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::table('tickets', function (Blueprint $table): void {
+            $table->foreignId('source_purchase_id')
+                ->nullable()
+                ->after('description')
+                ->constrained('compras')
+                ->cascadeOnUpdate()
+                ->nullOnDelete();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('tickets', function (Blueprint $table): void {
+            $table->dropConstrainedForeignId('source_purchase_id');
+        });
+    }
+};