afegida cache a resource manager per evitar accessos a disc

source/engine.cpp

@@ -282,6 +282,13 @@ bool Engine::initialize(int width, int height, int zoom, bool fullscreen, AppMod
             // No es crítico, continuar sin logo
             app_logo_.reset();
         }
+
+        // Precalentar caché: shapes PNG (evitar I/O en primera activación de PNG_SHAPE)
+        {
+            unsigned char* tmp = nullptr; size_t tmp_size = 0;
+            ResourceManager::loadResource("shapes/jailgames.png", tmp, tmp_size);
+            delete[] tmp;
+        }
     }
 
     return success;