New routes:
- GET /users — list all users
- GET/POST /templates — list and create templates
- PATCH /templates/:id — update template
- POST /templates/preview — render template with ticket/demo context
Enhanced routes:
- tickets: custom field support on create, status classification helper
- custom-fields: PATCH endpoint, auto-generate short key from name
- lifecycles: PATCH endpoint
- queues: PATCH endpoint
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
