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/test_multimodal.py

@@ -4,8 +4,8 @@ InsightFlow Multimodal Module Test Script
 测试多模态支持模块
 """
 
-import sys
 import os
+import sys
 
 # 添加 backend 目录到路径
 sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
@@ -18,25 +18,19 @@ print("=" * 60)
 print("\n1. 测试模块导入...")
 
 try:
-    from multimodal_processor import (
-        get_multimodal_processor
-    )
+    from multimodal_processor import get_multimodal_processor
     print("   ✓ multimodal_processor 导入成功")
 except ImportError as e:
     print(f"   ✗ multimodal_processor 导入失败: {e}")
 
 try:
-    from image_processor import (
-        get_image_processor
-    )
+    from image_processor import get_image_processor
     print("   ✓ image_processor 导入成功")
 except ImportError as e:
     print(f"   ✗ image_processor 导入失败: {e}")
 
 try:
-    from multimodal_entity_linker import (
-        get_multimodal_entity_linker
-    )
+    from multimodal_entity_linker import get_multimodal_entity_linker
     print("   ✓ multimodal_entity_linker 导入成功")
 except ImportError as e:
     print(f"   ✗ multimodal_entity_linker 导入失败: {e}")