change zero-gpu support

app.py

@@ -15,6 +15,15 @@ import onnxruntime as ort
 import pyopenjtalk
 import soundfile as sf
 
+try:
+    import spaces
+except ImportError:
+    class spaces:
+        @staticmethod
+        def GPU(func):
+            return func
+
+
 # ============================================================================
 # Configuration
 # ============================================================================
@@ -206,14 +215,17 @@ def get_model_manager(model_name: str) -> ONNXModelManager:
     return model_managers[model_name]
 
 
-# Initialize default model
-get_model_manager(DEFAULT_MODEL)
+# Pre-load all available models
+print("Pre-loading all models for ZeroGPU...")
+for model_name in get_available_models():
+    get_model_manager(model_name)
+print("All models loaded.")
 
 # ============================================================================
 # Gradio Interface Functions
 # ============================================================================
 
-
+@spaces.GPU
 def synthesise(
     text: str,
     model_name: str,