feat: implement multi-tenant cart functionality and add image validation helper

app/Domains/Cart/Resources/CartItemResource.php

@@ -48,6 +48,7 @@ class CartItemResource extends JsonResource
             'cantidad' => $this->cantidad,
             'precio_unitario' => $this->formatMoney($product?->precio),
             'product_id' => $product?->id,
+            'product_variant_id' => $this->producto_variante_id,
             'product' => $product === null ? null : [
                 'nombre' => $productName,
                 'imagen' => $imageUrl,

app/Domains/Shared/Rules/ImageOrBase64Rule.php

@@ -21,6 +21,10 @@ class ImageOrBase64Rule implements ValidationRule
         if (is_string($value)) {
             $payload = trim($value);
 
+            if (\Illuminate\Support\Str::isUuid($payload)) {
+                return;
+            }
+
             if ($payload === '') {
                 $fail("The :attribute must not be empty.");
                 return;