Document X-Zammad-Suppress-Notifications header for ticket update API

[dominikklein]

Summary

Documents the new X-Zammad-Suppress-Notifications: true HTTP header introduced in zammad/zammad#6042.

Adds a tip block to the Update section of the Tickets API page explaining:

• How to use the header to suppress agent notifications (email + in-app)
• That it targets automated integrations to avoid notification loops
• Permission scope: agents and admins only, ignored for customers
• That the same header works on POST /api/v1/ticket_articles and the GraphQL ticketUpdate mutation

Related

• Implementation MR: https://git.zammad.com/zammad/zammad/-/merge_requests/13394
• GitHub issue: Option to suppress notification for ticket updates via API zammad#6042

[github-actions]

Artifacts

Produced during runtime

📦 html-fea9817

[dominikklein]

@ralf401 @fliebe92 Maybe you can have a look.