feat: Add event association to purchases; implement event relationship in models, update migration, and enhance tests

app/Domains/Purchase/Models/Purchase.php

@@ -4,6 +4,7 @@ namespace App\Domains\Purchase\Models;
 
 use App\Domains\Auth\Models\User;
 use App\Domains\Cart\Models\Cart;
+use App\Domains\Event\Models\Event;
 use App\Domains\Logging\Models\Concerns\LogsValueChanges;
 use App\Domains\Purchase\Events\PurchasePaid;
 use App\Domains\Tenant\Models\Tenant;
@@ -19,6 +20,7 @@ use Illuminate\Support\Facades\DB;
 #[Fillable([
     'cart_id',
     'tenant_codigo',
+    'event_id',
     'user_id',
     'status',
     'payment_method',
@@ -70,6 +72,7 @@ class Purchase extends Model
     {
         return [
             'cart_id' => 'integer',
+            'event_id' => 'integer',
             'user_id' => 'integer',
             'expires_at' => 'datetime',
             'total' => 'decimal:2',
@@ -84,6 +87,12 @@ class Purchase extends Model
         return $this->belongsTo(Tenant::class, 'tenant_codigo', 'codigo');
     }
 
+    /** @return BelongsTo<Event, $this> */
+    public function event(): BelongsTo
+    {
+        return $this->belongsTo(Event::class);
+    }
+
     /**
      * @return BelongsTo<User, $this>
      */