Ensure sensitive environment variables are securely handled

[mattfsourcecode]

Ensure sensitive environment variables, such as JWT_SECRET and ORIGIN_FRONTEND, are not exposed in API responses, error messages, or logs. Implement unit tests and integration tests to verify proper handling and safeguard against accidental exposure of these variables in production. This includes:

• Testing API responses to ensure no sensitive data is leaked.
• Verifying that error messages do not include sensitive information.
• Validating logging configurations to exclude sensitive environment variables.