Add my CS 1.6 server

[Xenova0]

---

^{Need help on this PR? Tag @codesmith-bot with what you need. Autofix is disabled.}

[github-actions]

Server list PR validation

✅ Ready to merge — 1 entry verified, no problems found.

Probed 1 new or changed entry.

Gamedir	Address	Change	Claimed	Responder	Host	Notes
cstrike	173.212.228.115:27015	new	49 (Xash)	49 (Xash)	Counter-Strike 1.6 Server	✅ answered on the declared protocol.

---

_{Probes can be flaky on the first try; the nightly publish workflow re-probes with a 48 h grace window, so a single ❌ here is not necessarily fatal. Re-push to re-run.}