fix: correct column names in scheduler status query (total, errores)

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

main.py

@@ -81,7 +81,7 @@ async def scheduler_status():
     next_run = job.next_run_time.isoformat() if job and job.next_run_time else None
     conn = get_connection()
     row = conn.execute(
-        "SELECT created_at, total_procesados, total_errores, origen "
+        "SELECT created_at, total, errores, origen "
         "FROM sync_wa_log WHERE origen='scheduler' ORDER BY id DESC LIMIT 1"
     ).fetchone()
     conn.close()