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
- 修复重复函数定义 (health_check, create_webhook_endpoint, etc)
- 修复未定义名称 (SearchOperator, TenantTier, Query, Body, logger)
- 修复 workflow_manager.py 的类定义重复问题
- 添加缺失的导入

backend/oss_uploader.py

@@ -5,9 +5,10 @@ OSS 上传工具 - 用于阿里听悟音频上传
 
 import os
 import uuid
-from datetime import datetime, timedelta
+from datetime import datetime
 import oss2
 
+
 class OSSUploader:
     def __init__(self):
         self.access_key = os.getenv("ALI_ACCESS_KEY")
@@ -15,33 +16,35 @@ class OSSUploader:
         self.bucket_name = os.getenv("OSS_BUCKET", "insightflow-audio")
         self.region = os.getenv("OSS_REGION", "oss-cn-hangzhou.aliyuncs.com")
         self.endpoint = f"https://{self.region}"
-        
+
         if not self.access_key or not self.secret_key:
             raise ValueError("ALI_ACCESS_KEY and ALI_SECRET_KEY must be set")
-        
+
         self.auth = oss2.Auth(self.access_key, self.secret_key)
         self.bucket = oss2.Bucket(self.auth, self.endpoint, self.bucket_name)
-    
+
     def upload_audio(self, audio_data: bytes, filename: str) -> tuple:
         """上传音频到 OSS，返回 (URL, object_name)"""
         # 生成唯一文件名
         ext = os.path.splitext(filename)[1] or ".wav"
         object_name = f"audio/{datetime.now().strftime('%Y%m%d')}/{uuid.uuid4().hex}{ext}"
-        
+
         # 上传文件
         self.bucket.put_object(object_name, audio_data)
-        
+
         # 生成临时访问 URL (1小时有效)
-        url = self.bucket.sign_url('GET', object_name, 3600)
+        url = self.bucket.sign_url("GET", object_name, 3600)
         return url, object_name
-    
+
     def delete_object(self, object_name: str):
         """删除 OSS 对象"""
         self.bucket.delete_object(object_name)
 
+
 # 单例
 _oss_uploader = None
 
+
 def get_oss_uploader() -> OSSUploader:
     global _oss_uploader
     if _oss_uploader is None: