feat(exclusions): Integrate exclusion UI in CtaBoxSidebar component

- Add ExclusionFormPartial to CtaBoxSidebarFormBuilder
- Add _exclusions fields to CtaBoxSidebarFieldMapper with types
- Update AdminAjaxHandler to process json_array types via ExclusionFieldProcessor
- Enqueue exclusion-toggle.js in AdminAssetEnqueuer

The exclusion UI now appears in CTA Box Sidebar visibility section,
allowing admins to exclude component from specific categories,
post IDs, or URL patterns.

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

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

Admin/CtaBoxSidebar/Infrastructure/FieldMapping/CtaBoxSidebarFieldMapper.php

@@ -38,6 +38,12 @@ final class CtaBoxSidebarFieldMapper implements FieldMapperInterface
             'ctaVisibilityArchives' => ['group' => '_page_visibility', 'attribute' => 'show_on_archives'],
             'ctaVisibilitySearch' => ['group' => '_page_visibility', 'attribute' => 'show_on_search'],
 
+            // Exclusions (grupo especial _exclusions - Plan 99.11)
+            'ctaExclusionsEnabled' => ['group' => '_exclusions', 'attribute' => 'exclusions_enabled'],
+            'ctaExcludeCategories' => ['group' => '_exclusions', 'attribute' => 'exclude_categories', 'type' => 'json_array'],
+            'ctaExcludePostIds' => ['group' => '_exclusions', 'attribute' => 'exclude_post_ids', 'type' => 'json_array_int'],
+            'ctaExcludeUrlPatterns' => ['group' => '_exclusions', 'attribute' => 'exclude_url_patterns', 'type' => 'json_array_lines'],
+
             // Content
             'ctaTitle' => ['group' => 'content', 'attribute' => 'title'],
             'ctaDescription' => ['group' => 'content', 'attribute' => 'description'],