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/neo4j_manager.py

@@ -107,7 +107,7 @@ class Neo4jManager:
 
         self._connect()
 
-    def _connect(self):
+    def _connect(self) -> None:
         """建立 Neo4j 连接"""
         if not NEO4J_AVAILABLE:
             return
@@ -121,7 +121,7 @@ class Neo4jManager:
             logger.error(f"Failed to connect to Neo4j: {e}")
             self._driver = None
 
-    def close(self):
+    def close(self) -> None:
         """关闭连接"""
         if self._driver:
             self._driver.close()
@@ -137,7 +137,7 @@ class Neo4jManager:
         except BaseException:
             return False
 
-    def init_schema(self):
+    def init_schema(self) -> None:
         """初始化图数据库 Schema（约束和索引）"""
         if not self._driver:
             logger.error("Neo4j not connected")
@@ -178,7 +178,7 @@ class Neo4jManager:
 
     # ==================== 数据同步 ====================
 
-    def sync_project(self, project_id: str, project_name: str, project_description: str = ""):
+    def sync_project(self, project_id: str, project_name: str, project_description: str = "") -> None:
         """同步项目节点到 Neo4j"""
         if not self._driver:
             return
@@ -196,7 +196,7 @@ class Neo4jManager:
                 description=project_description,
             )
 
-    def sync_entity(self, entity: GraphEntity):
+    def sync_entity(self, entity: GraphEntity) -> None:
         """同步单个实体到 Neo4j"""
         if not self._driver:
             return
@@ -225,7 +225,7 @@ class Neo4jManager:
                 properties=json.dumps(entity.properties),
             )
 
-    def sync_entities_batch(self, entities: list[GraphEntity]):
+    def sync_entities_batch(self, entities: list[GraphEntity]) -> None:
         """批量同步实体到 Neo4j"""
         if not self._driver or not entities:
             return
@@ -262,7 +262,7 @@ class Neo4jManager:
                 entities=entities_data,
             )
 
-    def sync_relation(self, relation: GraphRelation):
+    def sync_relation(self, relation: GraphRelation) -> None:
         """同步单个关系到 Neo4j"""
         if not self._driver:
             return
@@ -286,7 +286,7 @@ class Neo4jManager:
                 properties=json.dumps(relation.properties),
             )
 
-    def sync_relations_batch(self, relations: list[GraphRelation]):
+    def sync_relations_batch(self, relations: list[GraphRelation]) -> None:
         """批量同步关系到 Neo4j"""
         if not self._driver or not relations:
             return
@@ -318,7 +318,7 @@ class Neo4jManager:
                 relations=relations_data,
             )
 
-    def delete_entity(self, entity_id: str):
+    def delete_entity(self, entity_id: str) -> None:
         """从 Neo4j 删除实体及其关系"""
         if not self._driver:
             return
@@ -332,7 +332,7 @@ class Neo4jManager:
                 id=entity_id,
             )
 
-    def delete_project(self, project_id: str):
+    def delete_project(self, project_id: str) -> None:
         """从 Neo4j 删除项目及其所有实体和关系"""
         if not self._driver:
             return
@@ -949,7 +949,7 @@ def get_neo4j_manager() -> Neo4jManager:
     return _neo4j_manager
 
 
-def close_neo4j_manager():
+def close_neo4j_manager() -> None:
     """关闭 Neo4j 连接"""
     global _neo4j_manager
     if _neo4j_manager:
@@ -958,7 +958,7 @@ def close_neo4j_manager():
 
 
 # 便捷函数
-def sync_project_to_neo4j(project_id: str, project_name: str, entities: list[dict], relations: list[dict]):
+def sync_project_to_neo4j(project_id: str, project_name: str, entities: list[dict], relations: list[dict]) -> None:
     """
     同步整个项目到 Neo4j