BUGFIX: 404 error when saving editable complaint fields
PROBLEM: When editing complaint name or remark in IPD discharge
form, the AJAX request to update_complaint_field returned HTTP 404.
ROOT CAUSE: In CodeIgniter 4, routes must be explicitly defined.
The new update_complaint_field method was added to Ipd_discharge
controller but no route was registered in Routes.php.
SOLUTION: Added POST route for Ipd_discharge/update_complaint_field
in app/Config/Routes.php following the existing pattern for other
Ipd_discharge AJAX endpoints.
Now editable complaint fields save correctly with green/red feedback.
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