geoip: embed DB-IP Lite country database snapshot (CC BY 4.0, provenance in NOTICE)

internal/web/service/geoipdata/NOTICE

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+Country database attribution
+============================
+
+The embedded country.mmdb is the DB-IP Lite country database
+(dbip-country, IPv4+IPv6 combined), converted to MMDB format by the
+sapics/ip-location-db project:
+
+  https://github.com/sapics/ip-location-db
+
+The underlying data is made available by DB-IP (https://db-ip.com)
+under the Creative Commons Attribution 4.0 International License
+(CC BY 4.0):
+
+  https://creativecommons.org/licenses/by/4.0/
+
+Attribution: IP geolocation data by DB-IP, https://db-ip.com
+
+Snapshot provenance (factory copy embedded in the binary):
+  source file : dbip-country.mmdb (sapics/ip-location-db "latest" release)
+  retrieved   : 2026-10-24
+  size        : 8300093 bytes
+  sha256      : fcecf33b565fcda088bbcb7a959b5b35c8e5195ed64fcd67daa3cd9384f6272b
+
+Locally updated copies (downloaded by the master's weekly updater
+into the data folder as geoip-country.mmdb) supersede this snapshot
+at runtime; they are the same database from the same source.