feat(geoip): country-code enrichment via RIR delegated-stats

Populates Attacker.country_code + country_source (MVP) using the five
RIR delegated-stats files (ARIN/RIPE/APNIC/LACNIC/AFRINIC). Offline,
license-free, no outbound traffic that could burn honeypot stealth.

- decnet.geoip package with factory/base/lookup + rir/ subpackage
  (fetch/parse/provider) mirroring the db + bus factory convention
- Profiler._build_record calls enrich_ip on every upsert
- Idempotent ALTER TABLE migrations for both SQLite and MySQL
- decnet geoip refresh/lookup CLI (master-only)
- /var/lib/decnet/geoip seeded by decnet init
- DECNET_GEOIP_ENABLED=false kill-switch; set in tests/conftest.py so
  unit tests never trigger the first-access fetch

decnet/cli/geoip.py

@@ -0,0 +1,59 @@
+"""GeoIP CLI — refresh and lookup subcommands (master-only).
+
+Usage::
+
+    decnet geoip refresh          # re-download RIR files and rebuild the index
+    decnet geoip lookup 8.8.8.8   # one-shot IP -> country dump
+"""
+from __future__ import annotations
+
+import typer
+
+from .gating import _require_master_mode
+from .utils import console, log
+
+_group = typer.Typer(
+    name="geoip",
+    help="GeoIP provider management (master only).",
+    no_args_is_help=True,
+)
+
+
+@_group.command("refresh")
+def _refresh() -> None:
+    """Force re-download of the GeoIP provider data and rebuild the index."""
+    _require_master_mode("geoip refresh")
+    from decnet.geoip import get_lookup
+    from decnet.geoip.factory import get_provider
+
+    provider = get_provider()
+    log.info("geoip: forcing refresh via %s provider", provider.name)
+    console.print(f"[bold cyan]Refreshing {provider.name} GeoIP data…[/]")
+    try:
+        lookup = get_lookup(force_refresh=True)
+    except Exception as exc:  # noqa: BLE001
+        console.print(f"[red]refresh failed: {exc}[/]")
+        raise typer.Exit(1) from exc
+    console.print(
+        f"[green]OK[/] {provider.name} index rebuilt "
+        f"({len(lookup)} ranges)."
+    )
+
+
+@_group.command("lookup")
+def _lookup(
+    ip: str = typer.Argument(..., help="IP address to resolve."),
+) -> None:
+    """Print the country code for an IP (or 'unknown')."""
+    _require_master_mode("geoip lookup")
+    from decnet.geoip import enrich_ip
+
+    cc, source = enrich_ip(ip)
+    if cc is None:
+        console.print(f"{ip} [yellow]unknown[/]")
+        raise typer.Exit(0)
+    console.print(f"{ip} [green]cc={cc}[/] source={source}")
+
+
+def register(app: typer.Typer) -> None:
+    app.add_typer(_group, name="geoip")