Cleanup code

src/data/actors/character.js

@@ -188,4 +188,8 @@ export default class CharacterDataModel extends foundry.abstract.TypeDataModel {
 
     return schema
   }
+
+  prepareDerivedData() {
+    this.anti_initiative = 25 - (this.initiative ?? 0)
+  }
 }

src/data/actors/npc.js

@@ -56,4 +56,10 @@ export default class NpcDataModel extends foundry.abstract.TypeDataModel {
       }),
     }
   }
+
+  prepareDerivedData() {
+    this.anti_initiative = 25 - (this.initiative ?? 0)
+    this.vitality.calcul = (this.aptitudes.physical.value ?? 0) * 4
+    this.hei.calcul = (this.aptitudes.spiritual.value ?? 0) * 4
+  }
 }