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/knowledge_reasoner.py

@@ -51,7 +51,7 @@ class InferencePath:
 class KnowledgeReasoner:
     """知识推理引擎"""
 
-    def __init__(self, api_key: str = None, base_url: str = None) -> None:
+    def __init__(self, api_key: str | None = None, base_url: str = None) -> None:
         self.api_key = api_key or KIMI_API_KEY
         self.base_url = base_url or KIMI_BASE_URL
         self.headers = {
@@ -82,7 +82,11 @@ class KnowledgeReasoner:
             return result["choices"][0]["message"]["content"]
 
     async def enhanced_qa(
-        self, query: str, project_context: dict, graph_data: dict, reasoning_depth: str = "medium",
+        self,
+        query: str,
+        project_context: dict,
+        graph_data: dict,
+        reasoning_depth: str = "medium",
     ) -> ReasoningResult:
         """
         增强问答 - 结合图谱推理的问答
@@ -139,7 +143,10 @@ class KnowledgeReasoner:
         return {"type": "factual", "entities": [], "intent": "general", "complexity": "simple"}
 
     async def _causal_reasoning(
-        self, query: str, project_context: dict, graph_data: dict,
+        self,
+        query: str,
+        project_context: dict,
+        graph_data: dict,
     ) -> ReasoningResult:
         """因果推理 - 分析原因和影响"""
 
@@ -200,7 +207,10 @@ class KnowledgeReasoner:
         )
 
     async def _comparative_reasoning(
-        self, query: str, project_context: dict, graph_data: dict,
+        self,
+        query: str,
+        project_context: dict,
+        graph_data: dict,
     ) -> ReasoningResult:
         """对比推理 - 比较实体间的异同"""
 
@@ -254,7 +264,10 @@ class KnowledgeReasoner:
         )
 
     async def _temporal_reasoning(
-        self, query: str, project_context: dict, graph_data: dict,
+        self,
+        query: str,
+        project_context: dict,
+        graph_data: dict,
     ) -> ReasoningResult:
         """时序推理 - 分析时间线和演变"""
 
@@ -308,7 +321,10 @@ class KnowledgeReasoner:
         )
 
     async def _associative_reasoning(
-        self, query: str, project_context: dict, graph_data: dict,
+        self,
+        query: str,
+        project_context: dict,
+        graph_data: dict,
     ) -> ReasoningResult:
         """关联推理 - 发现实体间的隐含关联"""
 
@@ -362,7 +378,11 @@ class KnowledgeReasoner:
         )
 
     def find_inference_paths(
-        self, start_entity: str, end_entity: str, graph_data: dict, max_depth: int = 3,
+        self,
+        start_entity: str,
+        end_entity: str,
+        graph_data: dict,
+        max_depth: int = 3,
     ) -> list[InferencePath]:
         """
         发现两个实体之间的推理路径
@@ -449,7 +469,10 @@ class KnowledgeReasoner:
         return length_factor * confidence_factor
 
     async def summarize_project(
-        self, project_context: dict, graph_data: dict, summary_type: str = "comprehensive",
+        self,
+        project_context: dict,
+        graph_data: dict,
+        summary_type: str = "comprehensive",
     ) -> dict:
         """
         项目智能总结