def generate_speech(text: str, language: str = "zh") -> str:
    """Public interface for TTS generation
    
    This is a legacy function maintained for backward compatibility.
    New code should use the factory pattern implementation directly.
    """
    from utils.tts_base import DummyTTSEngine
    
    # Create a dummy engine and generate speech
    dummy_engine = DummyTTSEngine()
    return dummy_engine.generate_speech(text, "af_heart", 1.0)