feat/security

Reviewed-on: #2

docs/geoip-guide.md

@@ -0,0 +1,19 @@
+# GeoIP Guide (Planning)
+
+This project intentionally does not enable GeoIP enforcement yet.
+
+Planned integration target: `github.com/rabuchaim/geoip2fast`.
+
+## Recommended approach
+
+1. Load one shared GeoIP provider instance at startup.
+2. Add a small in-memory cache keyed by IP with TTL.
+3. Apply lookup timeout and fallback to `unknown` values on failures.
+4. Use results first in the admin security detail pane.
+5. Add aggregated statistics only after detail pane behavior is stable.
+
+## Why this is safe
+
+- No request path should fail because GeoIP lookup fails.
+- Lookup cost stays bounded with caching.
+- Security decisions remain independent from GeoIP quality.