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/ai_manager.py

@@ -27,7 +27,6 @@ import httpx
 # Database path
 DB_PATH = os.path.join(os.path.dirname(__file__), "insightflow.db")
 
-
 class ModelType(StrEnum):
     """模型类型"""
 
@@ -36,7 +35,6 @@ class ModelType(StrEnum):
     SUMMARIZATION = "summarization"  # 摘要
     PREDICTION = "prediction"  # 预测
 
-
 class ModelStatus(StrEnum):
     """模型状态"""
 
@@ -46,7 +44,6 @@ class ModelStatus(StrEnum):
     FAILED = "failed"
     ARCHIVED = "archived"
 
-
 class MultimodalProvider(StrEnum):
     """多模态模型提供商"""
 
@@ -55,7 +52,6 @@ class MultimodalProvider(StrEnum):
     GEMINI = "gemini-pro-vision"
     KIMI_VL = "kimi-vl"
 
-
 class PredictionType(StrEnum):
     """预测类型"""
 
@@ -64,7 +60,6 @@ class PredictionType(StrEnum):
     ENTITY_GROWTH = "entity_growth"  # 实体增长预测
     RELATION_EVOLUTION = "relation_evolution"  # 关系演变预测
 
-
 @dataclass
 class CustomModel:
     """自定义模型"""
@@ -84,7 +79,6 @@ class CustomModel:
     trained_at: str | None
     created_by: str
 
-
 @dataclass
 class TrainingSample:
     """训练样本"""
@@ -96,7 +90,6 @@ class TrainingSample:
     metadata: dict
     created_at: str
 
-
 @dataclass
 class MultimodalAnalysis:
     """多模态分析结果"""
@@ -113,7 +106,6 @@ class MultimodalAnalysis:
     cost: float
     created_at: str
 
-
 @dataclass
 class KnowledgeGraphRAG:
     """基于知识图谱的 RAG 配置"""
@@ -130,7 +122,6 @@ class KnowledgeGraphRAG:
     created_at: str
     updated_at: str
 
-
 @dataclass
 class RAGQuery:
     """RAG 查询记录"""
@@ -146,7 +137,6 @@ class RAGQuery:
     latency_ms: int
     created_at: str
 
-
 @dataclass
 class PredictionModel:
     """预测模型"""
@@ -166,7 +156,6 @@ class PredictionModel:
     created_at: str
     updated_at: str
 
-
 @dataclass
 class PredictionResult:
     """预测结果"""
@@ -182,7 +171,6 @@ class PredictionResult:
     is_correct: bool | None
     created_at: str
 
-
 @dataclass
 class SmartSummary:
     """智能摘要"""
@@ -200,7 +188,6 @@ class SmartSummary:
     tokens_used: int
     created_at: str
 
-
 class AIManager:
     """AI 能力管理主类"""
 
@@ -1500,11 +1487,9 @@ class AIManager:
             created_at=row["created_at"],
         )
 
-
 # Singleton instance
 _ai_manager = None
 
-
 def get_ai_manager() -> AIManager:
     global _ai_manager
     if _ai_manager is None: