feat: fix

app.py

@@ -43,7 +43,7 @@ _model_lock = threading.Lock()  # Thread lock for model initialization
 
 def initialize_models():
     """Initialize models on first GPU call (ZeroGPU optimization: load inside GPU context)"""
-    global encoder, common_tts_engine, whisper_asr, args_global
+    global encoder, common_tts_engine, args_global
 
     # Fast path: check if already initialized (without lock)
     if common_tts_engine is not None: