se migran los print de los módulos a logging con nivel explícito

pipeline_utils.log pasa a usar logging (parámetro severity) y los print de
pipeline, sapb1_manager, hana_manager, outlook_utilities, email_utilities y
main pasan a logger.info/warning/error, de modo que LOG_LEVEL filtre por
severidad. El texto del log no cambia. Se mantienen los print de CLI en
sunat_schema (__main__), tools/ y tests/.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

draft_sap.py

@@ -1,6 +1,7 @@
 """Validación de precios contra SAP y construcción del draft SAP B1."""
 
 import re
+import logging
 import math
 from datetime import datetime, timedelta
 
@@ -340,7 +341,7 @@ def validate_prices(factura: dict) -> tuple[bool, list[dict]]:
                 guias_lt.append({"guia": guia, "line_total": suma_line_total, "warehouse_code": ", ".join(sorted(wh_set)) if wh_set else "A-CENTRA", "quantity": max_qty, "price_after_vat_sum": sum_pav, "zona":zona, "weight1": weight1, "draft_quantity": 0, "draft_price": 0.0})
                 all_wh.update(wh_set)
             except Exception as ex:
-                log(f"⚠️  Guía {codigo_guia}: error al consultar SAP - {ex}", 2)
+                log(f"⚠️  Guía {codigo_guia}: error al consultar SAP - {ex}", 2, severity=logging.WARNING)
                 guias_lt.append({"guia": guia, "line_total": 0.0, "warehouse_code": "A-CENTRA", "weight1": 0.0, "quantity": 0.0, "price_after_vat_sum": 0.0, "zona": "", "draft_quantity": 0, "draft_price": 0.0})
                 all_ok = False
 
@@ -376,7 +377,7 @@ def validate_prices(factura: dict) -> tuple[bool, list[dict]]:
             if ok:
                 log(f"✅ Coincide: {total_linea:.6f} ≈ {sap_total:.6f}", 3)
             else:
-                log(f"❌ NO coincide — XML: {total_linea:.6f} vs SAP: {sap_total:.6f}", 3)
+                log(f"❌ NO coincide — XML: {total_linea:.6f} vs SAP: {sap_total:.6f}", 3, severity=logging.WARNING)
 
     todas_coinciden = all(r["ok"] for r in resultados)
     return todas_coinciden, resultados