* Update CustomersController.php Fix: replace GROUP BY + SUM join with withSum() to avoid ONLY_FULL_GROUP_BY; no API changes (same aliases) * Update CustomersController.php style: apply Laravel Pint formatting
* Update CustomersController.php Fix: replace GROUP BY + SUM join with withSum() to avoid ONLY_FULL_GROUP_BY; no API changes (same aliases) * Update CustomersController.php style: apply Laravel Pint formatting