feat: implement multi-tenant cart system with stock reservation and inventory tracking

tests/Feature/Cart/CartControllerTest.php

@@ -83,7 +83,8 @@ class CartControllerTest extends TestCase
 
         $this->assertDatabaseHas('productos_variantes', [
             'id' => $variant->id,
-            'stock' => 8,
+            'stock_real' => 10,
+            'stock_reservado' => 2,
         ]);
     }
 
@@ -124,7 +125,8 @@ class CartControllerTest extends TestCase
         ]);
         $this->assertDatabaseHas('productos_variantes', [
             'id' => $variant->id,
-            'stock' => 7,
+            'stock_real' => 12,
+            'stock_reservado' => 5,
         ]);
     }
 
@@ -162,7 +164,8 @@ class CartControllerTest extends TestCase
         ]);
         $this->assertDatabaseHas('productos_variantes', [
             'id' => $variant->id,
-            'stock' => 5,
+            'stock_real' => 10,
+            'stock_reservado' => 5,
         ]);
     }
 
@@ -194,7 +197,8 @@ class CartControllerTest extends TestCase
         $this->assertDatabaseCount('carrito_items', 0);
         $this->assertDatabaseHas('productos_variantes', [
             'id' => $variant->id,
-            'stock' => 10,
+            'stock_real' => 10,
+            'stock_reservado' => 0,
         ]);
     }