fix: image processing logic for PIL Image input

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app.py

@@ -93,6 +93,9 @@ def process_image(image, ocr_type="ocr", ocr_box="", ocr_color=""):
                 image = image.split(',')[1]
             image_data = base64.b64decode(image)
             image = Image.open(io.BytesIO(image_data))
+        elif not isinstance(image, Image.Image):
+            # その他の形式の場合はPIL Imageに変換
+            image = Image.open(image)
         
         # PIL ImageをRGB形式に変換
         if image.mode != 'RGB':