feat: implementar jerarquia d'entitats amb classe base Entitat

source/game/escenes/escena_joc.hpp

@@ -5,11 +5,10 @@
 #ifndef ESCENA_JOC_HPP
 #define ESCENA_JOC_HPP
 
-#include <SDL3/SDL.h>
-
 #include <array>
 #include <cstdint>
 #include <memory>
+#include <string>
 
 #include "core/graphics/vector_text.hpp"
 #include "core/rendering/sdl_manager.hpp"
@@ -22,6 +21,7 @@
 #include "game/entities/bala.hpp"
 #include "game/entities/enemic.hpp"
 #include "game/entities/nau.hpp"
+#include "game/stage_system/stage_config.hpp"
 #include "game/stage_system/stage_manager.hpp"
 
 // Game over state machine