refactor: improve development workflow and code quality

- Add Spanish documentation for AGENTS.md and README.md
- Add pytest to main dependencies and taskipy for dev tasks
- Clean up unused imports across codebase
- Fix default config values for local development
- Update test fixtures to use standard pytest

tests/test_customer.py

@@ -1,7 +1,5 @@
 import pytest
-import pytest_asyncio
 from unittest.mock import MagicMock, patch
-import json
 
 import sys
 from pathlib import Path