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 (E302, E305, E501)
- 修复行长度超过100字符的问题
- 修复F821未定义名称错误

backend/multimodal_entity_linker.py

@@ -17,6 +17,7 @@ try:
 except ImportError:
     NUMPY_AVAILABLE = False
 
+
 @dataclass
 class MultimodalEntity:
     """多模态实体"""
@@ -35,6 +36,7 @@ class MultimodalEntity:
         if self.modality_features is None:
             self.modality_features = {}
 
+
 @dataclass
 class EntityLink:
     """实体关联"""
@@ -49,6 +51,7 @@ class EntityLink:
     confidence: float
     evidence: str
 
+
 @dataclass
 class AlignmentResult:
     """对齐结果"""
@@ -59,6 +62,7 @@ class AlignmentResult:
     match_type: str  # exact, fuzzy, embedding
     confidence: float
 
+
 @dataclass
 class FusionResult:
     """知识融合结果"""
@@ -69,6 +73,7 @@ class FusionResult:
     source_modalities: list[str]
     confidence: float
 
+
 class MultimodalEntityLinker:
     """多模态实体关联器 - 跨模态实体对齐和知识融合"""
 
@@ -510,9 +515,11 @@ class MultimodalEntityLinker:
             else 0,
         }
 
+
 # Singleton instance
 _multimodal_entity_linker = None
 
+
 def get_multimodal_entity_linker(similarity_threshold: float = 0.85) -> MultimodalEntityLinker:
     """获取多模态实体关联器单例"""
     global _multimodal_entity_linker