refactor(inventory): update stock validation rules and enforce stock_difference requirement

app/Domains/Ticketing/FiestaFutbolInfantil/Requests/UpdateHistoricalFoodStockRequest.php

@@ -17,10 +17,9 @@ class UpdateHistoricalFoodStockRequest extends FormRequest
         return [
             'variants' => ['required', 'array', 'min:1', 'max:500'],
             'stock_adjustment_id' => ['nullable', 'uuid'],
-            'variants.*' => ['required', 'array:id,stock,stock_difference'],
+            'variants.*' => ['required', 'array:id,stock_difference'],
             'variants.*.id' => ['required', 'integer', 'distinct'],
-            'variants.*.stock' => ['required', 'integer', 'min:0'],
-            'variants.*.stock_difference' => ['nullable', 'integer'],
+            'variants.*.stock_difference' => ['required', 'integer'],
         ];
     }
 }