feat: Update default models for extraction and normalization to GPT-5.6 Luna across configuration files and documentation. Remove deprecated code and improve pricing details in the UI components. Add tests to ensure correct model settings and pricing calculations.

services/bot_descarga/api/main.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import os
 from pathlib import Path
 from typing import Any, Dict, List, Optional