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/ServerRequestProviderInterface.php

@@ -0,0 +1,27 @@
+<?php
+declare(strict_types=1);
+
+namespace ROITheme\Shared\Domain\Contracts;
+
+/**
+ * Contrato para obtener datos del request HTTP
+ *
+ * Encapsula el acceso a $_SERVER para:
+ * - Evitar acceso directo a superglobales en Infrastructure
+ * - Permitir testear sin dependencia de $_SERVER
+ *
+ * v1.1: Nuevo - encapsular acceso a $_SERVER
+ *
+ * Metodos: 1 (cumple ISP < 5 metodos)
+ *
+ * @package ROITheme\Shared\Domain\Contracts
+ */
+interface ServerRequestProviderInterface
+{
+    /**
+     * Obtiene el Request URI actual
+     *
+     * @return string URI del request (ej: "/blog/mi-post/")
+     */
+    public function getRequestUri(): string;
+}