feat(cli): dynamic default range, --version, --verbose, --debug, --url, --api-key, --config

- #17: default date range falls back to current month when .env dates are missing
- #18: add --version, --verbose, --debug flags
- #20: add --url, --api-key, --config CLI overrides
- Config supports CLI overrides for URL/API key and explicit config file loading
- Update README with new CLI options
- Add tests for new flags and config overrides

Closes #17, closes #18, closes #20

tests/test_config.py

@@ -74,9 +74,19 @@ def test_get_default_date_range_from_env():
 
 @mock.patch.dict(os.environ, {}, clear=True)
 def test_get_default_date_range_fallback():
-    """Если даты не заданы -- используется хардкод-заглушка."""
+    """Если даты не заданы -- используется текущий месяц."""
+    from datetime import date, timedelta
+
+    today = date.today()
+    start = today.replace(day=1)
+    if today.month == 12:
+        next_month = today.replace(year=today.year + 1, month=1, day=1)
+    else:
+        next_month = today.replace(month=today.month + 1, day=1)
+    end = next_month - timedelta(days=1)
+
     result = Config.get_default_date_range()
-    assert "--" in result  # формат YYYY-MM-DD--YYYY-MM-DD
+    assert result == f"{start.isoformat()}--{end.isoformat()}"
 
 
 @mock.patch.dict(os.environ, {}, clear=True)