Fix avatar API to return all fields, add TMPDIR workaround to import script

- Use to_encoach_dict() for /api/exam/avatars so voiceId, voiceProvider,
  canvas are included in the response
- Set TMPDIR=/tmp in import script for PyTorch compatibility in Docker

Made-with: Cursor

encoach_api/controllers/exams.py

@@ -208,12 +208,7 @@ class ExamsController(EncoachMixin, http.Controller):
                 return self._error_response('Unauthorized', 401)
 
             avatars = request.env['encoach.elai.avatar'].sudo().search([])
-            data = [{
-                'name': a.name,
-                'avatar_code': a.avatar_code,
-                'avatar_url': a.avatar_url or '',
-                'gender': a.gender or '',
-            } for a in avatars]
+            data = [a.to_encoach_dict() for a in avatars]
             return self._json_response(data)
         except Exception:
             _logger.exception("List avatars error")