Add HF_TOKEN authentication for gated model access

api.py

@@ -6,9 +6,16 @@ import re
 from io import BytesIO
 import soundfile as sf
 from pydantic import BaseModel
+import os
+from huggingface_hub import login
 from parler_tts import ParlerTTSForConditionalGeneration
 from transformers import AutoTokenizer
 
+# Authenticate with HuggingFace if token is available
+hf_token = os.getenv("HF_TOKEN")
+if hf_token:
+    login(token=hf_token)
+
 # Try to import spaces for HF Spaces deployment
 try:
     import spaces