refactor: JD8_* a namespace Jd8::

source/game/modulegame.hpp

@@ -50,7 +50,7 @@ class ModuleGame : public scenes::Scene {
         Done,
     };
 
-    void Draw();    // render a `screen`; no crida JD8_Flip (ho fa el caller)
+    void Draw();    // render a `screen`; no crida Jd8::flip (ho fa el caller)
     void Update();  // gated per JG_ShouldUpdate
 
     void iniciarMomies();
@@ -59,7 +59,7 @@ class ModuleGame : public scenes::Scene {
     Phase phase_{Phase::FadingIn};
     scenes::PaletteFade fade_;
     Uint8 final_{0};
-    JD8_Surface gfx{nullptr};
+    Jd8::Surface gfx{nullptr};
 
     std::unique_ptr<Mapa> mapa;
     std::unique_ptr<Prota> sam;