fixed image saving format

api/app.py

@@ -52,7 +52,7 @@ def generate_design():
 
         # Saving sketch in filesystem
         model_key = list(json_data_from_req["MODEL"].keys())[0]  # Es: "03191"
-        image_filename = f"{model_key}_00.jpg"  # Nome file immagine es: "03191_00.jpg"
+        image_filename = f"{model_key}_00.jpeg"  # Nome file immagine es: "03191_00.jpg"
         image_save_path = os.path.join(image_save_dir, image_filename)
         image.save(image_save_path, format='JPEG')