Fix ticket page 500 from unbounded audit timeline (#112)

A ticket updated by hwmonDaemon had ~52k audit rows; getTicketTimeline()
loaded all of them and exhausted PHP's 128MB memory limit, so the ticket
page returned 500. Not related to the MCP server.

- getTicketTimeline() takes a limit (newest first). The ticket page shows
  the latest 500 events with a note when older ones are omitted; the JSON
  export caps at 5000.
- create_ticket_api.php: the description is refreshed on every run, and
  that alone wrote a reason-only audit row every few minutes per open
  ticket. Audit only real title/priority changes.
- create_ticket_api.php: after creating a brand-new ticket the dedup retry
  loop fell through into a second iteration on a closed connection,
  appending a 500 error body after the success response. Exit instead.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MGDKHiU5RJdo3dqQUDow3X

controllers/TicketController.php

@@ -54,8 +54,14 @@ class TicketController
         $totalComments    = $this->commentModel->getCommentCount((int)$id);
         $comments         = $this->commentModel->getCommentsByTicketId($id, true, $commentPageSize, 0);
 
-        // Get timeline for this ticket
-        $timeline = $this->auditLogModel->getTicketTimeline($id);
+        // Get the newest timeline events for this ticket. One extra row is
+        // fetched only to tell the view that older events were left out.
+        $timelineLimit     = 500;
+        $timeline          = $this->auditLogModel->getTicketTimeline($id, $timelineLimit + 1);
+        $timelineTruncated = count($timeline) > $timelineLimit;
+        if ($timelineTruncated) {
+            array_pop($timeline);
+        }
 
         // Get all users for assignment dropdown
         $allUsers = $this->userModel->getAllUsers();