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/knowledge_reasoner.py

@@ -15,6 +15,7 @@ import httpx
 KIMI_API_KEY = os.getenv("KIMI_API_KEY", "")
 KIMI_BASE_URL = os.getenv("KIMI_BASE_URL", "https://api.kimi.com/coding")
 
+
 class ReasoningType(Enum):
     """推理类型"""
 
@@ -24,6 +25,7 @@ class ReasoningType(Enum):
     COMPARATIVE = "comparative"  # 对比推理
     SUMMARY = "summary"  # 总结推理
 
+
 @dataclass
 class ReasoningResult:
     """推理结果"""
@@ -35,6 +37,7 @@ class ReasoningResult:
     related_entities: list[str]  # 相关实体
     gaps: list[str]  # 知识缺口
 
+
 @dataclass
 class InferencePath:
     """推理路径"""
@@ -44,6 +47,7 @@ class InferencePath:
     path: list[dict]  # 路径上的节点和关系
     strength: float  # 路径强度
 
+
 class KnowledgeReasoner:
     """知识推理引擎"""
 
@@ -498,9 +502,11 @@ class KnowledgeReasoner:
             "confidence": 0.5,
         }
 
+
 # Singleton instance
 _reasoner = None
 
+
 def get_knowledge_reasoner() -> KnowledgeReasoner:
     global _reasoner
     if _reasoner is None: