fix: auto-fix code issues (cron)

- 修复重复导入/字段 (llm_client.py 中的重复注释)
- 修复PEP8格式问题 (E501行长度超过100字符)
- 修复多行SQL语句和字符串格式化
- 修复f-string过长问题

涉及文件:
- backend/developer_ecosystem_manager.py
- backend/document_processor.py
- backend/enterprise_manager.py
- backend/export_manager.py
- backend/growth_manager.py
- backend/llm_client.py
- backend/localization_manager.py
- backend/main.py
- backend/neo4j_manager.py
- backend/ops_manager.py
- backend/performance_manager.py
- backend/plugin_manager.py
- backend/search_manager.py
- backend/security_manager.py
- backend/subscription_manager.py
- backend/tenant_manager.py
- backend/test_phase8_task6.py
- backend/test_phase8_task8.py
- backend/tingwu_client.py
- backend/workflow_manager.py

backend/tingwu_client.py

@@ -35,7 +35,8 @@ class TingwuClient:
             "x-acs-action": "CreateTask",
             "x-acs-version": "2023-09-30",
             "x-acs-date": timestamp,
-            "Authorization": f"ACS3-HMAC-SHA256 Credential = {self.access_key}/acs/tingwu/cn-beijing",
+            "Authorization": f"ACS3-HMAC-SHA256 Credential = {self.access_key}"
+            f"/acs/tingwu/cn-beijing",
         }
 
     def create_task(self, audio_url: str, language: str = "zh") -> str: