fix: auto-fix code issues (cron)

- 修复重复导入/字段
- 修复异常处理
- 修复PEP8格式问题
- 添加类型注解

backend/image_processor.py

@@ -328,7 +328,7 @@ class ImageProcessor:
         return unique_entities
 
     def generate_description(
-        self, image_type: str, ocr_text: str, entities: list[ImageEntity]
+        self, image_type: str, ocr_text: str, entities: list[ImageEntity],
     ) -> str:
         """
         生成图片描述
@@ -481,13 +481,13 @@ class ImageProcessor:
                                 target=sentence_entities[j].name,
                                 relation_type="related",
                                 confidence=0.5,
-                            )
+                            ),
                         )
 
         return relations
 
     def process_batch(
-        self, images_data: list[tuple[bytes, str]], project_id: str = None
+        self, images_data: list[tuple[bytes, str]], project_id: str = None,
     ) -> BatchProcessingResult:
         """
         批量处理图片