Add integration tests for CampTix admin functionality (#1644)

* Add integration tests for CampTix admin functionality

Adds 58 integration tests covering CampTix admin areas.
Tests cover ticket validation/inventory, coupon management,
stats tracking, status transitions, options validation,
revenue reporting, and post save logic.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: dd32