Fix: Use HF_TOKEN from environment for Inference API authentication

app.py

@@ -1,10 +1,13 @@
 """
 DeepMed-R1: Medical Reasoning AI Demo
 """
+import os
 import gradio as gr
 from huggingface_hub import InferenceClient
 
-client = InferenceClient("Qwen/Qwen3-4B")
+# Use HF_TOKEN from Space secrets for authenticated inference
+HF_TOKEN = os.environ.get("HF_TOKEN")
+client = InferenceClient("Qwen/Qwen3-4B", token=HF_TOKEN)
 
 SYSTEM_PROMPT = """You are DeepMed-R1, a medical reasoning AI trained with GRPO and multi-objective clinical rewards.
 
@@ -23,7 +26,7 @@ EXAMPLES = [
     ["A 65-year-old male with hypertension presents with sudden 'worst headache of my life,' neck stiffness, photophobia. BP 180/100. Most likely diagnosis?\nA. Migraine\nB. Subarachnoid hemorrhage\nC. Meningitis\nD. Tension headache"],
     ["A 28-year-old woman: fatigue, weight gain, cold intolerance. TSH 12 mIU/L, Free T4 0.5 ng/dL. Initial treatment?\nA. Levothyroxine\nB. Liothyronine\nC. Methimazole\nD. Radioactive iodine"],
     ["3-month-old with projectile non-bilious vomiting, olive-shaped RUQ mass, metabolic alkalosis. Diagnosis?\nA. Pyloric stenosis\nB. Intussusception\nC. Malrotation\nD. Hirschsprung disease"],
-    ["55-year-old diabetic: RUQ pain, fever 39.2°C, jaundice (Charcot's triad). WBC 18K, bilirubin 5.2, CBD stone on US. Next step?\nA. Cholecystectomy\nB. ERCP with sphincterotomy\nC. MRCP\nD. PTC"],
+    ["55-year-old diabetic: RUQ pain, fever 39.2C, jaundice (Charcot's triad). WBC 18K, bilirubin 5.2, CBD stone on US. Next step?\nA. Cholecystectomy\nB. ERCP with sphincterotomy\nC. MRCP\nD. PTC"],
     ["22-year-old post-MVC: left chest pain, absent breath sounds left, trachea deviated right, JVD, BP 80/50. Immediate management?\nA. Chest X-ray\nB. CT chest\nC. Needle decompression left chest\nD. Intubation"],
 ]