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

@@ -15,7 +15,6 @@ 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"""
 
@@ -25,7 +24,6 @@ class ReasoningType(Enum):
     COMPARATIVE = "comparative"  # 对比推理
     SUMMARY = "summary"  # 总结推理
 
-
 @dataclass
 class ReasoningResult:
     """推理结果"""
@@ -37,7 +35,6 @@ class ReasoningResult:
     related_entities: list[str]  # 相关实体
     gaps: list[str]  # 知识缺口
 
-
 @dataclass
 class InferencePath:
     """推理路径"""
@@ -47,7 +44,6 @@ 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"""
 
@@ -484,11 +480,9 @@ class KnowledgeReasoner:
             "confidence": 0.5,
         }
 
-
 # Singleton instance
 _reasoner = None
 
-
 def get_knowledge_reasoner() -> KnowledgeReasoner:
     global _reasoner
     if _reasoner is None: