Fix ticket ID generation in create_ticket_api.php to avoid leading zeros

Use random_int(100000000-999999999) so IDs are always 9 digits without
a leading zero, matching the behaviour of TicketModel::createTicket().
The old sprintf('%09d', mt_rand(1, ...)) could produce IDs like
000123456 which broke PHP array key lookups elsewhere.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

create_ticket_api.php

@@ -333,7 +333,12 @@ if ($existing) {
 }
 
 // No existing ticket — create a new one
-$ticket_id = sprintf('%09d', mt_rand(1, 999999999));
+// Use random_int range 100000000-999999999 to avoid leading-zero IDs
+try {
+    $ticket_id = (string)random_int(100000000, 999999999);
+} catch (Exception $e) {
+    $ticket_id = (string)mt_rand(100000000, 999999999);
+}
 $insertStmt = $conn->prepare(
     "INSERT INTO tickets (ticket_id, title, description, status, priority, category, type, hash, created_by)
      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)"