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/growth_manager.py

@@ -1405,7 +1405,8 @@ class GrowthManager:
                 conn.execute(
                     """
                     INSERT INTO email_logs
-                    (id, campaign_id, tenant_id, user_id, email, template_id, status, subject, created_at)
+                    (id, campaign_id, tenant_id, user_id, email, template_id,
+                     status, subject, created_at)
                     VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
                 """,
                     (
@@ -1647,7 +1648,8 @@ class GrowthManager:
 
             # 更新执行计数
             conn.execute(
-                "UPDATE automation_workflows SET execution_count = execution_count + 1 WHERE id = ?",
+                """UPDATE automation_workflows
+                SET execution_count = execution_count + 1 WHERE id = ?""",
                 (workflow_id,),
             )
             conn.commit()