fix: auto-fix code issues (cron)

- 修复重复导入/字段
- 修复异常处理 (BaseException -> 具体异常类型)
- 修复PEP8格式问题
- 添加类型注解
- 修复tingwu_client.py缩进错误

backend/test_multimodal.py

@@ -46,7 +46,7 @@ print("\n2. 测试模块初始化...")
 
 try:
     processor = get_multimodal_processor()
-    print(f"   ✓ MultimodalProcessor 初始化成功")
+    print("   ✓ MultimodalProcessor 初始化成功")
     print(f"     - 临时目录: {processor.temp_dir}")
     print(f"     - 帧提取间隔: {processor.frame_interval}秒")
 except Exception as e:
@@ -54,14 +54,14 @@ except Exception as e:
 
 try:
     img_processor = get_image_processor()
-    print(f"   ✓ ImageProcessor 初始化成功")
+    print("   ✓ ImageProcessor 初始化成功")
     print(f"     - 临时目录: {img_processor.temp_dir}")
 except Exception as e:
     print(f"   ✗ ImageProcessor 初始化失败: {e}")
 
 try:
     linker = get_multimodal_entity_linker()
-    print(f"   ✓ MultimodalEntityLinker 初始化成功")
+    print("   ✓ MultimodalEntityLinker 初始化成功")
     print(f"     - 相似度阈值: {linker.similarity_threshold}")
 except Exception as e:
     print(f"   ✗ MultimodalEntityLinker 初始化失败: {e}")