Rename generated image file to include 'flux' prefix for better identification

FLUX.py

@@ -106,7 +106,7 @@ def generate_image(prompt, request_id, current_request_id, image_dir, attempt=0)
         raise
 
     timestamp = int(time.time())
-    image_filename = f"background_{timestamp}.png"
+    image_filename = f"flux_{timestamp}.png"
     image_path = os.path.join(image_dir, image_filename)
     
     # Ensure the image directory exists