fix: access file path using dictionary key instead of attribute in image processing functions

app.py

@@ -231,7 +231,7 @@ async def homepage():
 @app.api()
 def preprocess(image: FileData) -> FileData:
     init_models()
-    img = Image.open(image.path)
+    img = Image.open(image["path"])
     processed = pipeline.preprocess_image(img)
     out_path = os.path.join(TMP_DIR, f"preprocessed_{int(time.time()*1000)}.png")
     processed.save(out_path)
@@ -260,7 +260,7 @@ def generate_3d(
     torch.manual_seed(seed)
     hr_resolution = int(resolution)
     
-    img = Image.open(image.path)
+    img = Image.open(image["path"])
     image_preprocessed = pipeline.preprocess_image(img)
     temp_processed_path = os.path.join(TMP_DIR, "temp_proc.png")
     image_preprocessed.save(temp_processed_path)