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/oss_uploader.py

@@ -12,29 +12,29 @@ import oss2
 
 class OSSUploader:
     def __init__(self) -> None:
-        self.access_key  = os.getenv("ALI_ACCESS_KEY")
-        self.secret_key  = os.getenv("ALI_SECRET_KEY")
-        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}"
+        self.access_key = os.getenv("ALI_ACCESS_KEY")
+        self.secret_key = os.getenv("ALI_SECRET_KEY")
+        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)
+        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}"
+        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) -> None:
@@ -43,11 +43,11 @@ class OSSUploader:
 
 
 # 单例
-_oss_uploader  = None
+_oss_uploader = None
 
 
 def get_oss_uploader() -> OSSUploader:
     global _oss_uploader
     if _oss_uploader is None:
-        _oss_uploader  = OSSUploader()
+        _oss_uploader = OSSUploader()
     return _oss_uploader