config: increase scheduler ventana from 10 to 60 minutes

Doctors can order exams up to ~45 min after the patient is registered
at reception. With 10 min window the exam sync missed those cases.
60 min ensures late-ordered exams are always captured and pushed to
WhatsApp Lab via upsert.

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

main.py

@@ -66,7 +66,7 @@ async def startup():
     contratos_defaults()
     async def _job_sync():
         try:
-            resultado = await sync_recientes(ventana_min=10)
+            resultado = await sync_recientes(ventana_min=60)
             if not resultado.get("ok") and resultado.get("error"):
                 guardar_sync_log(
                     {"total": 0, "created": 0, "skipped": 0, "updated": 0, "errores": 1, "detalle": [