feat: one-click deploy.sh (system deps + venv + DB + systemd)
scripts/deploy.sh covers the full path from fresh OS to running service:
1. install system packages (apt/yum/dnf auto-detect, includes bind/python3/venv/git)
2. create Python venv + pip install -r requirements.txt (avoids PEP 668)
3. init SQLite DB (default admin/admin)
4. delegate BIND config to setup-bind.sh (or --skip-bind)
5. install + enable systemd unit dns-web (gunicorn, port 5300)
6. restart + verify (port listen + HTTP 302)
Idempotent; supports --dry-run, --skip-bind, --port, DNS_WEB_PORT/USER/WORKERS.
Type=exec (not Type=notify) because gunicorn 21.x has no sd_notify.
README updated with deploy.sh as recommended path; .gitignore adds venv/.
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