fix: mount FastAPI router into Gradio app for API endpoints on port 7860

app.py

@@ -250,23 +250,18 @@ with gr.Blocks(title="Video Face Swap", theme=gr.themes.Soft()) as demo:
     demo.queue()
 
 if __name__ == "__main__":
-    import threading
-    import uvicorn
-    import os
-    
-    # Start FastAPI server in background thread
-    def run_api():
-        try:
-            from api.main import app as api_app
-            uvicorn.run(api_app, host="0.0.0.0", port=8000, log_level="info")
-        except Exception as e:
-            print(f"API startup error: {e}")
-    
-    # Only start API if not in Gradio's main thread
-    if os.environ.get("GRADIO_SERVER_NAME") is None:
-        api_thread = threading.Thread(target=run_api, daemon=True)
-        api_thread.start()
-        print("FastAPI server starting on port 8000...")
+    # Mount FastAPI routes into Gradio's FastAPI app
+    try:
+        from api.main import app as api_app
+        
+        # Mount API routes directly to Gradio's FastAPI app
+        # demo.app is the FastAPI instance used by Gradio
+        demo.app.include_router(api_app.router)
+        print("✅ FastAPI routes mounted to Gradio app")
+    except Exception as e:
+        print(f"API integration error: {e}")
+        import traceback
+        traceback.print_exc()
     
-    # Launch Gradio app
+    # Launch Gradio app (FastAPI routes are now accessible on same port 7860)
     demo.launch(server_port=7860, share=False)