refactor(entities): unifica loader d'animacio via AnimationComponent::fromYaml i elimina fps:

data/entities/rolling_rock/rolling_rock.yaml

@@ -13,7 +13,7 @@ flags:
   collides: true
   interactable: false
 animations:
-  roll: { frames: [0], fps: 10, loop: true }
+  roll: { frames: [0], frame_ms: 100, loop: true }
 ai:
   type: straight_line
   initial_direction: right