`metin-login-healthcheck.sh` is a root-only operational check for the Debian VPS.

What it does:
- creates a temporary account in MariaDB
- runs `metin_login_smoke` against auth and channel ports
- verifies `AUTH_SUCCESS`, `EMPIRE`, `LOGIN_SUCCESS4`, character select, and `ENTERGAME`
- creates a temporary character when the temporary account is empty
- deletes the temporary account and temporary character rows on exit
- passes the expected client version string to the smoke client

Default paths and ports are tuned for the current VPS layout. Override with env vars if needed:
- `RUN_AS_USER`
- `SERVER_HOST`
- `AUTH_PORT`
- `CHANNEL_PORT`
- `SMOKE_BIN`

For richer ad-hoc testing, call `metin_login_smoke` directly. It now supports:
- `--json`
- `--expect-auth-failure=STATUS`
- `--expect-channel-failure=STATUS`
- `--create-character-name=NAME`
- `--client-version=VERSION`
