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/Contracts/ExclusionRepositoryInterface.php

@@ -0,0 +1,36 @@
+<?php
+declare(strict_types=1);
+
+namespace ROITheme\Shared\Domain\Contracts;
+
+use ROITheme\Shared\Domain\ValueObjects\ExclusionRuleSet;
+
+/**
+ * Contrato para acceder a la configuracion de exclusiones
+ *
+ * Metodos: 3 (cumple ISP < 5 metodos)
+ *
+ * @package ROITheme\Shared\Domain\Contracts
+ */
+interface ExclusionRepositoryInterface
+{
+    /**
+     * Obtiene las exclusiones configuradas para un componente
+     *
+     * @param string $componentName Nombre del componente (kebab-case)
+     * @return ExclusionRuleSet Configuracion de exclusiones
+     */
+    public function getExclusions(string $componentName): ExclusionRuleSet;
+
+    /**
+     * Guarda la configuracion de exclusiones de un componente
+     *
+     * @param ExclusionRuleSet $exclusions Configuracion a guardar
+     */
+    public function saveExclusions(ExclusionRuleSet $exclusions): void;
+
+    /**
+     * Verifica si existe configuracion de exclusiones para un componente
+     */
+    public function hasExclusions(string $componentName): bool;
+}