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/search_manager.py

@@ -19,6 +19,7 @@ from dataclasses import dataclass, field
 from datetime import datetime
 from enum import Enum
 
+
 class SearchOperator(Enum):
     """搜索操作符"""
 
@@ -26,6 +27,7 @@ class SearchOperator(Enum):
     OR = "OR"
     NOT = "NOT"
 
+
 # 尝试导入 sentence-transformers 用于语义搜索
 try:
     from sentence_transformers import SentenceTransformer
@@ -37,6 +39,7 @@ except ImportError:
 
 # ==================== 数据模型 ====================
 
+
 @dataclass
 class SearchResult:
     """搜索结果数据模型"""
@@ -60,6 +63,7 @@ class SearchResult:
             "metadata": self.metadata,
         }
 
+
 @dataclass
 class SemanticSearchResult:
     """语义搜索结果数据模型"""
@@ -85,6 +89,7 @@ class SemanticSearchResult:
             result["embedding_dim"] = len(self.embedding)
         return result
 
+
 @dataclass
 class EntityPath:
     """实体关系路径数据模型"""
@@ -114,6 +119,7 @@ class EntityPath:
             "path_description": self.path_description,
         }
 
+
 @dataclass
 class KnowledgeGap:
     """知识缺口数据模型"""
@@ -141,6 +147,7 @@ class KnowledgeGap:
             "metadata": self.metadata,
         }
 
+
 @dataclass
 class SearchIndex:
     """搜索索引数据模型"""
@@ -154,6 +161,7 @@ class SearchIndex:
     created_at: str
     updated_at: str
 
+
 @dataclass
 class TextEmbedding:
     """文本 Embedding 数据模型"""
@@ -168,6 +176,7 @@ class TextEmbedding:
 
 # ==================== 全文搜索 ====================
 
+
 class FullTextSearch:
     """
     全文搜索模块
@@ -778,6 +787,7 @@ class FullTextSearch:
 
 # ==================== 语义搜索 ====================
 
+
 class SemanticSearch:
     """
     语义搜索模块
@@ -1140,6 +1150,7 @@ class SemanticSearch:
 
 # ==================== 实体关系路径发现 ====================
 
+
 class EntityPathDiscovery:
     """
     实体关系路径发现模块
@@ -1611,6 +1622,7 @@ class EntityPathDiscovery:
 
 # ==================== 知识缺口识别 ====================
 
+
 class KnowledgeGapDetection:
     """
     知识缺口识别模块
@@ -2015,6 +2027,7 @@ class KnowledgeGapDetection:
 
 # ==================== 搜索管理器 ====================
 
+
 class SearchManager:
     """
     搜索管理器 - 统一入口
@@ -2187,9 +2200,11 @@ class SearchManager:
             "semantic_search_available": self.semantic_search.is_available(),
         }
 
+
 # 单例模式
 _search_manager = None
 
+
 def get_search_manager(db_path: str = "insightflow.db") -> SearchManager:
     """获取搜索管理器单例"""
     global _search_manager
@@ -2198,6 +2213,8 @@ def get_search_manager(db_path: str = "insightflow.db") -> SearchManager:
     return _search_manager
 
 # 便捷函数
+
+
 def fulltext_search(
     query: str, project_id: str | None = None, limit: int = 20
 ) -> list[SearchResult]:
@@ -2205,6 +2222,7 @@ def fulltext_search(
     manager = get_search_manager()
     return manager.fulltext_search.search(query, project_id, limit=limit)
 
+
 def semantic_search(
     query: str, project_id: str | None = None, top_k: int = 10
 ) -> list[SemanticSearchResult]:
@@ -2212,11 +2230,13 @@ def semantic_search(
     manager = get_search_manager()
     return manager.semantic_search.search(query, project_id, top_k=top_k)
 
+
 def find_entity_path(source_id: str, target_id: str, max_depth: int = 5) -> EntityPath | None:
     """查找实体路径便捷函数"""
     manager = get_search_manager()
     return manager.path_discovery.find_shortest_path(source_id, target_id, max_depth)
 
+
 def detect_knowledge_gaps(project_id: str) -> list[KnowledgeGap]:
     """知识缺口检测便捷函数"""
     manager = get_search_manager()