refactor: move Analytics from ThemeSettings to AdsensePlacement

- Remove Analytics and AdSense tabs from theme-settings component
- Add Analytics group to adsense-placement component
- Add roi_enqueue_analytics_script() for GA4/UA support
- Clean up ThemeSettings to only handle custom code (CSS/JS)
- Update FormBuilders and FieldMappers accordingly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Admin/ThemeSettings/Infrastructure/FieldMapping/ThemeSettingsFieldMapper.php

@@ -24,14 +24,6 @@ final class ThemeSettingsFieldMapper implements FieldMapperInterface
     public function getFieldMapping(): array
     {
         return [
-            // Analytics
-            'themeSettingsGaTrackingId' => ['group' => 'analytics', 'attribute' => 'ga_tracking_id'],
-            'themeSettingsGaAnonymizeIp' => ['group' => 'analytics', 'attribute' => 'ga_anonymize_ip'],
-
-            // AdSense
-            'themeSettingsAdsensePublisherId' => ['group' => 'adsense', 'attribute' => 'adsense_publisher_id'],
-            'themeSettingsAdsenseAutoAds' => ['group' => 'adsense', 'attribute' => 'adsense_auto_ads'],
-
             // Custom Code
             'themeSettingsCustomCss' => ['group' => 'custom_code', 'attribute' => 'custom_css'],
             'themeSettingsCustomJsHeader' => ['group' => 'custom_code', 'attribute' => 'custom_js_header'],