feat(exclusions): Implement component exclusion system (Plan 99.11)

Adds ability to exclude components from specific:
- Categories (by slug or term_id)
- Post/Page IDs
- URL patterns (substring or regex)

Architecture:
- Domain: Value Objects (CategoryExclusion, PostIdExclusion,
  UrlPatternExclusion, ExclusionRuleSet) + Contracts
- Application: EvaluateExclusionsUseCase +
  EvaluateComponentVisibilityUseCase (orchestrator)
- Infrastructure: WordPressExclusionRepository,
  WordPressPageContextProvider, WordPressServerRequestProvider
- Admin: ExclusionFormPartial (reusable UI),
  ExclusionFieldProcessor, JS toggle

The PageVisibilityHelper now uses the orchestrator UseCase that
combines page-type visibility (Plan 99.10) with exclusion rules.

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

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

Shared/Domain/Constants/ExclusionDefaults.php

@@ -0,0 +1,37 @@
+<?php
+declare(strict_types=1);
+
+namespace ROITheme\Shared\Domain\Constants;
+
+/**
+ * Constantes de exclusion por defecto para componentes
+ *
+ * @package ROITheme\Shared\Domain\Constants
+ */
+final class ExclusionDefaults
+{
+    /**
+     * Configuracion de exclusion por defecto (sin exclusiones)
+     */
+    public const DEFAULT_EXCLUSIONS = [
+        'exclusions_enabled' => false,
+        'exclude_categories' => '[]',
+        'exclude_post_ids' => '[]',
+        'exclude_url_patterns' => '[]',
+    ];
+
+    /**
+     * Lista de campos de exclusion validos
+     */
+    public const EXCLUSION_FIELDS = [
+        'exclusions_enabled',
+        'exclude_categories',
+        'exclude_post_ids',
+        'exclude_url_patterns',
+    ];
+
+    /**
+     * Nombre del grupo en BD
+     */
+    public const GROUP_NAME = '_exclusions';
+}