Wires AuditService and AppVersionRepository into DeploymentController.
Replaces null createdBy placeholder with currentUserId() on createDeployment/promote.
Adds audit log entries (SUCCESS + FAILURE) for deploy_app, stop_deployment,
and promote_deployment actions. Fixes FK violations in affected ITs by
seeding the test-operator and alice users into the users table before deploy calls.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>