Address code review: restore filter passthrough and add clarifying comments

services/nginx/app/routes/usersRoute.php

@@ -257,16 +257,22 @@ class usersRoute
             || (is_array($customerNumberFilter) && in_array('0', $customerNumberFilter, true));
 
         if (!$isEmployeeFilter) {
+            // When include mode is on but the filter is not a customer_number:0 query,
+            // pass the original filter through as forced filters so they are not discarded.
+            // When include mode is off, null causes listObjectsWithPaginationIfSet to fall
+            // back to reading the filters from the request, which is equivalent.
             return [
                 'enabled' => false,
-                'filters' => null,
+                'filters' => $enabled ? $filters : null,
                 'additional_where' => null,
             ];
         }
 
+        // $activeLimitedEmployeeSubquery is a hardcoded constant with no user input.
         $activeLimitedEmployeeSubquery = 'SELECT `user_id` FROM `limited_backoffice_employees` WHERE `deactivated_at` IS NULL';
 
         if (!$enabled) {
+            // Exclude active limited backoffice employees when the include flag is not set.
             return [
                 'enabled' => false,
                 'filters' => null,