feat(cache): WP Fastest Cache statt WP Super Cache

Die Cache-Integration war für WP Super Cache gebaut, eingesetzt wird aber
WP Fastest Cache. Profil (wpfc), Listener, Drosselung, lit/cache-clear und
Leeren-Probe laufen jetzt über die öffentlichen WPFC-Funktionen
wpfc_clear_post_cache_by_id/wpfc_clear_all_cache; die Probe leert nur die
Wegwerf-Seite (singleDeleteCache ohne Elternseiten) und prüft, dass WPFC
den Hook noch verarbeitet. Smoke fastest-cache-smoke.sh ersetzt den WPSC-Smoke.

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

src/Compatibility/ProbeStep.php

@@ -8,7 +8,7 @@ use Closure;
 
 defined('ABSPATH') || exit;
 
-/** The one check step a profile's behaviour probe makes (Profile::$extraSteps), shared by Pods and WP Super Cache. */
+/** The one check step a profile's behaviour probe makes (Profile::$extraSteps), shared by Pods and WP Fastest Cache. */
 final class ProbeStep
 {
     /**

src/Compatibility/ThrowawayPost.php

@@ -22,7 +22,7 @@ defined('ABSPATH') || exit;
  */
 final class ThrowawayPost
 {
-    /** Meta key and title prefix the Pods and WP Super Cache probes give their entries (the Divi write probe has its own). */
+    /** Meta key and title prefix the Pods and WP Fastest Cache probes give their entries (the Divi write probe has its own). */
     public const MARKER = '_lit_mcp_check_entry';
 
     public const TITLE = '[LIT MCP Prüfung]';