fix: resolve RedisCache array offset error and improve discovery diagnostics

- Fix RedisCache driver to handle MGET failures gracefully with fallback
- Add comprehensive discovery context comparison debug tools
- Identify root cause: WEB context discovery missing 166 items vs CLI
- WEB context missing RequestFactory class entirely (52 vs 69 commands)
- Improved exception handling with detailed binding diagnostics

src/Framework/Core/Events/EventDispatcher.php

@@ -170,6 +170,18 @@ final class EventDispatcher implements EventDispatcherInterface
         return $this;
     }
 
+    /**
+     * Alias für addHandler - für bessere API Kompatibilität
+     */
+    public function listen(
+        string $eventClass,
+        callable $handler,
+        ?int $priority = null,
+        bool $stopPropagation = false
+    ): self {
+        return $this->addHandler($eventClass, $handler, $priority, $stopPropagation);
+    }
+
     /**
      * Prüft, ob Handler für den angegebenen Event-Typ registriert sind
      *