fix: Correct critical bugs and complete Creature/Group DataModel implementation

- Fix TypeError: controls.find is not a function in hooks.mjs
- Fix undefined 'npc' variable in applications.mjs
- Fix CONFIG.VERMINE.model undefined by checking game.system.template existence
- Fix TypeError: html.find(...).forEach is not a function in roll.mjs
- Fix Cannot set properties of undefined (setting 'initial') in actor.mjs
- Fix Cannot read properties of undefined (reading 'difficulty') in actor.mjs
- Fix ActiveEffect application phase 'initial' already completed by adding combatStatus to base template
- Fix Missing helper: 'select' in roll-dialog.hbs (removed invalid Handlebars select block)
- Add SIZE_LEVELS labels to creatureSizeLevels config
- Add SIZE_LEVELS translations to fr.json
- Add combatStatus to base actor template
- Convert all .html templates to .hbs for Foundry v14 compatibility
- Update item-sheet.mjs to use .hbs extension
- Update handlebars-manager.mjs to use .hbs for all partials

Complete Vermine2047 Creature and Group sheet implementation:
- Creature: Pattern, Size, Role, Pack with computed values
- Group: Totem, Reserve, Morale, Objectives, Members management
- All templates functional with proper styling

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

templates/dialogs/roll-dialog.hbs

@@ -157,13 +157,11 @@
             min="3"
             max="10"
           >
-            {{#select difficulty }}
               <option value="{{ diffLevel 'difficulty' 1}}">{{ diffLevel 'label' 1}} ({{ diffLevel 'difficulty' 1}})</option>
               <option value="{{ diffLevel 'difficulty' 2}}">{{ diffLevel 'label' 2}} ({{ diffLevel 'difficulty' 2}})</option>
               <option value="{{ diffLevel 'difficulty' 3}}" selected>{{ diffLevel 'label' 3}} ({{ diffLevel 'difficulty' 3}})</option>
               <option value="{{ diffLevel 'difficulty' 4}}">{{ diffLevel 'label' 4}} ({{ diffLevel 'difficulty' 4}})</option>
               <option value="{{ diffLevel 'difficulty' 5}}">{{ diffLevel 'label' 5}} ({{ diffLevel 'difficulty' 5}})</option>
-            {{/select}}
           </select>
         </div>
         <div class="flexcol">