feat: add wave 3 local database plugins

GeoIP and ASN lookup via MaxMind GeoLite2 mmdb, Tor exit node check
against local bulk exit list, IP reputation via Firehol/ET blocklist
feeds, and CVE lookup against local NVD JSON mirror.

Includes cron-friendly update script (scripts/update-data.sh) for all
data sources and make update-data target. GeoLite2 requires a free
MaxMind license key; all other sources are freely downloadable.

Plugins: geoip, asn, torcheck, iprep, cve
Commands: !geoip, !asn, !tor, !iprep, !cve

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,15 @@
+.gitignore
+__pycache__/
+*.pyc
+*.pyo
+*.egg-info/
+dist/
+build/
+.venv/
+.eggs/
+*.egg
+.ruff_cache/
+.pytest_cache/
+.mypy_cache/
+config/derp.toml
+data/