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/enterprise_manager.py

@@ -699,7 +699,9 @@ class EnterpriseManager:
             conn.close()
 
     def get_tenant_sso_config(
-        self, tenant_id: str, provider: str | None = None,
+        self,
+        tenant_id: str,
+        provider: str | None = None,
     ) -> SSOConfig | None:
         """获取租户的 SSO 配置"""
         conn = self._get_connection()
@@ -871,7 +873,10 @@ class EnterpriseManager:
         return metadata
 
     def create_saml_auth_request(
-        self, tenant_id: str, config_id: str, relay_state: str | None = None,
+        self,
+        tenant_id: str,
+        config_id: str,
+        relay_state: str | None = None,
     ) -> SAMLAuthRequest:
         """创建 SAML 认证请求"""
         conn = self._get_connection()
@@ -1235,7 +1240,10 @@ class EnterpriseManager:
         return []
 
     def _upsert_scim_user(
-        self, conn: sqlite3.Connection, tenant_id: str, user_data: dict[str, Any],
+        self,
+        conn: sqlite3.Connection,
+        tenant_id: str,
+        user_data: dict[str, Any],
     ) -> None:
         """插入或更新 SCIM 用户"""
         cursor = conn.cursor()
@@ -1405,7 +1413,11 @@ class EnterpriseManager:
             try:
                 # 获取审计日志数据
                 logs = self._fetch_audit_logs(
-                    export.tenant_id, export.start_date, export.end_date, export.filters, db_manager,
+                    export.tenant_id,
+                    export.start_date,
+                    export.end_date,
+                    export.filters,
+                    db_manager,
                 )
 
                 # 根据合规标准过滤字段
@@ -1414,7 +1426,9 @@ class EnterpriseManager:
 
                 # 生成导出文件
                 file_path, file_size, checksum = self._generate_export_file(
-                    export_id, logs, export.export_format,
+                    export_id,
+                    logs,
+                    export.export_format,
                 )
 
                 now = datetime.now()
@@ -1465,7 +1479,9 @@ class EnterpriseManager:
         return []
 
     def _apply_compliance_filter(
-        self, logs: list[dict[str, Any]], standard: str,
+        self,
+        logs: list[dict[str, Any]],
+        standard: str,
     ) -> list[dict[str, Any]]:
         """应用合规标准字段过滤"""
         fields = self.COMPLIANCE_FIELDS.get(ComplianceStandard(standard), [])
@@ -1481,7 +1497,10 @@ class EnterpriseManager:
         return filtered_logs
 
     def _generate_export_file(
-        self, export_id: str, logs: list[dict[str, Any]], format: str,
+        self,
+        export_id: str,
+        logs: list[dict[str, Any]],
+        format: str,
     ) -> tuple[str, int, str]:
         """生成导出文件"""
         import hashlib
@@ -1672,7 +1691,9 @@ class EnterpriseManager:
             conn.close()
 
     def list_retention_policies(
-        self, tenant_id: str, resource_type: str | None = None,
+        self,
+        tenant_id: str,
+        resource_type: str | None = None,
     ) -> list[DataRetentionPolicy]:
         """列出数据保留策略"""
         conn = self._get_connection()
@@ -1876,7 +1897,10 @@ class EnterpriseManager:
             conn.close()
 
     def _retain_audit_logs(
-        self, conn: sqlite3.Connection, policy: DataRetentionPolicy, cutoff_date: datetime,
+        self,
+        conn: sqlite3.Connection,
+        policy: DataRetentionPolicy,
+        cutoff_date: datetime,
     ) -> dict[str, int]:
         """保留审计日志"""
         cursor = conn.cursor()
@@ -1909,14 +1933,20 @@ class EnterpriseManager:
         return {"affected": 0, "archived": 0, "deleted": 0, "errors": 0}
 
     def _retain_projects(
-        self, conn: sqlite3.Connection, policy: DataRetentionPolicy, cutoff_date: datetime,
+        self,
+        conn: sqlite3.Connection,
+        policy: DataRetentionPolicy,
+        cutoff_date: datetime,
     ) -> dict[str, int]:
         """保留项目数据"""
         # 简化实现
         return {"affected": 0, "archived": 0, "deleted": 0, "errors": 0}
 
     def _retain_transcripts(
-        self, conn: sqlite3.Connection, policy: DataRetentionPolicy, cutoff_date: datetime,
+        self,
+        conn: sqlite3.Connection,
+        policy: DataRetentionPolicy,
+        cutoff_date: datetime,
     ) -> dict[str, int]:
         """保留转录数据"""
         # 简化实现
@@ -2101,9 +2131,11 @@ class EnterpriseManager:
                 if isinstance(row["start_date"], str)
                 else row["start_date"]
             ),
-            end_date=datetime.fromisoformat(row["end_date"])
-            if isinstance(row["end_date"], str)
-            else row["end_date"],
+            end_date=(
+                datetime.fromisoformat(row["end_date"])
+                if isinstance(row["end_date"], str)
+                else row["end_date"]
+            ),
             filters=json.loads(row["filters"] or "{}"),
             compliance_standard=row["compliance_standard"],
             status=row["status"],