Add server deployment smoke check

[XploitGost]

Summary

• add a small static server deployment smoke check for systemd, Docker, compose, dockerignore, and safe Linux server docs
• add a backend unit test for the smoke check
• link the smoke command from Linux deployment docs and release checklist

Validation

• python scripts/qa/server_deployment_smoke.py
• python -m unittest tests.test_server_deployment_smoke tests.test_release_readiness -v
• python -m unittest discover -s tests -v
• python -m pip check

Security

No command/control, remote shell, file collection, raw forwarding, TLS decryption, MITM, credential collection, IPS/auto-blocking, or AI autonomous actions were added.