refactor: Divi-Boot-Schritte in DiviIntegration::boot() (Bootable) – Upgrader-Hook, Prüf-Route, CLI und Reiter „Divi“ über lit_mcp_admin_tabs; IntegrationRegistry::boot() bootet jede Integration genau einmal; Prüfseiten-Aufräumen im load-Hook statt beim Rendern

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Integrations/Bootable.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations;
+
+defined('ABSPATH') || exit;
+
+/**
+ * An integration with boot steps of its own (hooks, REST routes, WP-CLI commands, admin tabs), so the composition
+ * root does not need to know them. IntegrationRegistry::boot() calls boot() whether or not the integration is
+ * available: Plugin boots on plugins_loaded, before the theme – isAvailable() cannot be asked yet.
+ */
+interface Bootable
+{
+    /** Registers the integration's own hooks, routes, CLI commands and admin tabs. Called once by Plugin. */
+    public function boot(): void;
+}