Add ip2geo IP geolocation provider

[bfzli]

Summary

• Adds a new provider for the ip2geo IP geolocation API
• Supports IPv4 and IPv6 address geocoding
• Returns 30+ fields: city, country, continent, ASN, currency, flag, timezone, registered country, etc.
• Authentication via X-Api-Key header injected into the FetchAdapter

Usage

var NodeGeocoder = require('node-geocoder');

var geocoder = NodeGeocoder({
    provider: 'ip2geo',
    apiKey: 'your-api-key'
});

geocoder.geocode('134.201.250.155').then(console.log);

Files changed

• New: lib/geocoder/ip2geogeocoder.js — provider implementation
• New: test/geocoder/ip2geogeocoder.test.js — unit tests
• Modified: lib/geocoderfactory.js — register ip2geo in the factory

Test plan

• npm test — 236/236 tests pass (all existing + new ip2geo tests)
• Live API test with real key returns correct data
• node -c syntax check passes