Feat: Add sous-type field to Creature sheets (Créature, Démon, Automata)

- Add soustype field to CreatureDataModel
- Add optionsSousTypeCreature to config with localization support
- Add sous-type select dropdown to creature-sheet.hbs header
- Add translation keys to fr.json

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

templates/creature-sheet.hbs

@@ -6,6 +6,12 @@
     <div class="header-banner">
       <img class="profile-img" src="{{actor.img}}" data-action="editImage" title="{{actor.name}}" />
       <h1 class="charname"><input name="name" type="text" value="{{actor.name}}" placeholder="Nom de la créature" /></h1>
+      <div class="header-subtitle">
+        <label>Sous-type: </label>
+        <select name="system.soustype">
+          {{selectOptions config.optionsSousTypeCreature selected=system.soustype valueAttr="key" nameAttr="key" labelAttr="label"}}
+        </select>
+      </div>
     </div>
 
     <div class="header-stat-cards">