fix: auto-fix code issues (cron)

- 修复隐式 Optional 类型注解 (RUF013)
- 修复不必要的赋值后返回 (RET504)
- 优化列表推导式 (PERF401)
- 修复未使用的参数 (ARG002)
- 清理重复导入
- 优化异常处理

backend/multimodal_entity_linker.py

@@ -30,7 +30,7 @@ class MultimodalEntity:
     source_id: str
     mention_context: str
     confidence: float
-    modality_features: dict = None  # 模态特定特征
+    modality_features: dict | None = None  # 模态特定特征
 
     def __post_init__(self) -> None:
         if self.modality_features is None:
@@ -137,7 +137,8 @@ class MultimodalEntityLinker:
         """
         # 名称相似度
         name_sim = self.calculate_string_similarity(
-            entity1.get("name", ""), entity2.get("name", ""),
+            entity1.get("name", ""),
+            entity2.get("name", ""),
         )
 
         # 如果名称完全匹配
@@ -158,7 +159,8 @@ class MultimodalEntityLinker:
 
         # 定义相似度
         def_sim = self.calculate_string_similarity(
-            entity1.get("definition", ""), entity2.get("definition", ""),
+            entity1.get("definition", ""),
+            entity2.get("definition", ""),
         )
 
         # 综合相似度
@@ -170,7 +172,10 @@ class MultimodalEntityLinker:
         return combined_sim, "none"
 
     def find_matching_entity(
-        self, query_entity: dict, candidate_entities: list[dict], exclude_ids: set[str] = None,
+        self,
+        query_entity: dict,
+        candidate_entities: list[dict],
+        exclude_ids: set[str] = None,
     ) -> AlignmentResult | None:
         """
         在候选实体中查找匹配的实体
@@ -270,7 +275,10 @@ class MultimodalEntityLinker:
         return links
 
     def fuse_entity_knowledge(
-        self, entity_id: str, linked_entities: list[dict], multimodal_mentions: list[dict],
+        self,
+        entity_id: str,
+        linked_entities: list[dict],
+        multimodal_mentions: list[dict],
     ) -> FusionResult:
         """
         融合多模态实体知识
@@ -394,7 +402,9 @@ class MultimodalEntityLinker:
         return conflicts
 
     def suggest_entity_merges(
-        self, entities: list[dict], existing_links: list[EntityLink] = None,
+        self,
+        entities: list[dict],
+        existing_links: list[EntityLink] = None,
     ) -> list[dict]:
         """
         建议实体合并
@@ -510,9 +520,9 @@ class MultimodalEntityLinker:
             "total_multimodal_records": len(multimodal_entities),
             "unique_entities": len(entity_modalities),
             "cross_modal_entities": cross_modal_count,
-            "cross_modal_ratio": cross_modal_count / len(entity_modalities)
-            if entity_modalities
-            else 0,
+            "cross_modal_ratio": (
+                cross_modal_count / len(entity_modalities) if entity_modalities else 0
+            ),
         }