refactor: Update model selection to use MODELS dictionary keys

app.py

@@ -301,11 +301,8 @@ with gr.Blocks() as demo:
             btn = gr.Button("Run")
             with gr.Accordion("Parameters", open=False):
                 model_choice = gr.Radio(
-                    choices=[
-                        "Qwen/Qwen2.5-Coder-32B-Instruct",
-                        "deepseek-ai/DeepSeek-V3",
-                    ],
-                    value="deepseek-ai/DeepSeek-V3",
+                    choices=list(MODELS.keys()),
+                    value=list(MODELS.keys())[0],
                     label="Model",
                 )
                 top_p = gr.Slider(