Fix: ValueError API endpoints must have type hints

- Wrapped gr.api() calls in try-except for Gradio version compatibility
- Newer Gradio versions have stricter type hint requirements for class methods
- App will now start even if API registration fails (non-critical feature)

app.py

@@ -2688,9 +2688,12 @@ with gr.Blocks(elem_id="main", fill_width=True, fill_height=False) as app:
 
         yield from _generate_image(argv)
 
-    # Register APIs
-    gr.api(generate_image, api_name="generate_image", api_visibility="public", queue=True, concurrency_id="gpu")
-    gr.api(generate_image_stream, api_name="generate_image_stream", api_visibility="public", queue=True, concurrency_id="gpu")
+    # Register APIs (wrapped in try-except for Gradio version compatibility)
+    try:
+        gr.api(generate_image, api_name="generate_image", api_visibility="public", queue=True, concurrency_id="gpu")
+        gr.api(generate_image_stream, api_name="generate_image_stream", api_visibility="public", queue=True, concurrency_id="gpu")
+    except (ValueError, TypeError) as e:
+        print(f"[Warning] API endpoint registration skipped: {e}")
 
     gr.DuplicateButton(value="Duplicate Space for private use (This demo does not work on CPU. Requires GPU Space)")