Add GeoIP country fallback for link click analytics.

Resolve countries from CDN headers first, then MaxMind GeoLite2 via visitor IP, with an artisan command to download and refresh the database.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/Feature/LinkAnalyticsTest.php

@@ -25,6 +25,8 @@ class LinkAnalyticsTest extends TestCase
 
     public function test_redirect_records_device_browser_os_and_country(): void
     {
+        config(['link.geoip_database' => base_path('tests/fixtures/GeoLite2-Country-Test.mmdb')]);
+
         $user = $this->user();
         ShortLink::create([
             'user_id' => $user->id,
@@ -50,6 +52,30 @@ class LinkAnalyticsTest extends TestCase
         $this->assertSame('GH', $click->country);
     }
 
+    public function test_redirect_records_country_from_ip_when_proxy_header_missing(): void
+    {
+        config(['link.geoip_database' => base_path('tests/fixtures/GeoLite2-Country-Test.mmdb')]);
+
+        $user = $this->user();
+        ShortLink::create([
+            'user_id' => $user->id,
+            'slug' => 'geo-ip',
+            'source_app' => 'link',
+            'source_kind' => 'redirect',
+            'is_managed_here' => true,
+            'destination_url' => 'https://example.com/target',
+            'is_active' => true,
+        ]);
+
+        $this->withServerVariables(['REMOTE_ADDR' => '81.2.69.142'])
+            ->withHeaders([
+                'User-Agent' => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
+            ])->get('https://ladl.link/geo-ip')
+            ->assertRedirect('https://example.com/target');
+
+        $this->assertSame('GB', LinkClick::first()?->country);
+    }
+
     public function test_breakdown_for_link_groups_clicks_by_device(): void
     {
         $user = $this->user();