From a Queens weekend clinic where patients lined up in front of his door and as many as 120 were seen a day, Dr. Stan Li wrote more than 17,000 prescriptions - mainly for oxycodone and other highly addictive painkillers - in the last 2 ? years, city Special Narcotics Prosecutor Bridget G. Brennan's office said as Li was charged with selling prescriptions to one patient even after the man repeated