- Fix secret references: all env vars now read from lunarfront-secrets (was referencing 3 non-existent separate secrets)
- Add ENCRYPTION_KEY, RESEND_API_KEY, MAIL_FROM, BUSINESS_NAME, INITIAL_USER_* env vars to backend container
- Add RESEND_API_KEY to manager deployment from manager-secrets
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>