feat: /claude et /mammouth one-shot API, fix admins persistance et work_hours

- Commandes /claude-apikey, /claude-models, /claude-model, /claude
- Commandes /mammouth-apikey, /mammouth-models, /mammouth-model, /mammouth
- Clés et modèles persistés dans config.json (apis.claude / apis.mammouth)
- B11: _save_admins_to_config() persiste admin_jids dans config.json
- B12: delegate.py vérifie work_hours avant délégation
- README mis à jour

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

skills/script.py

@@ -147,7 +147,7 @@ def run(args: str, context) -> str:
             return "Format : save <nom> | <contenu du script>"
         name_raw, content = rest.split("|", 1)
         name    = _safe_name(name_raw)
-        content = content.strip().replace("\\n", "\n")
+        content = content.strip().replace("\\n", "\n").replace('\\"', '"').replace("\\'", "'")
 
         if not name:
             return "Nom de script invalide."