Disable developer email and SMS inspection endpoints outside integration tests #1714

Goal

Prevent developer-only email and SMS inspection endpoints from being exposed by normal service deployments.

Context

/api/developer/lastemail and /api/developer/lastsms expose captured test messaging data.

Acceptance criteria

• The endpoints are not mapped unless the environment is explicitly IntegrationTest or another dedicated test environment.
• Production and staging requests cannot retrieve captured message contents.
• Existing integration tests continue to inspect test messages through a test-only mechanism.