feat(admin): Add theme-settings component for global configurations

- Add Schemas/theme-settings.json with analytics and custom_code groups
- Add ThemeSettingsFormBuilder for Admin Panel UI
- Add ThemeSettingsFieldMapper for AJAX field mapping
- Add ThemeSettingsRenderer for injecting GA/CSS/JS
- Add ThemeSettingsInjector for wp_head/wp_footer hooks
- Register component in AdminDashboardRenderer::getComponents()
- Register FieldMapper in FieldMapperProvider

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

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

Admin/Infrastructure/Ui/AdminDashboardRenderer.php

@@ -106,6 +106,11 @@ final class AdminDashboardRenderer implements DashboardRendererInterface
                 'label' => 'Footer',
                 'icon' => 'bi-layout-text-window-reverse',
             ],
+            'theme-settings' => [
+                'id' => 'theme-settings',
+                'label' => 'Theme Settings',
+                'icon' => 'bi-gear',
+            ],
         ];
     }