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/test_phase8_task8.py

@@ -275,7 +275,8 @@ class TestOpsManager:
                     """
                     INSERT INTO alerts
                     (id, rule_id, tenant_id, severity, status, title, description,
-                     metric, value, threshold, labels, annotations, started_at, notification_sent, suppression_count)
+                     metric, value, threshold, labels, annotations, started_at,
+                     notification_sent, suppression_count)
                     VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
                 """,
                     (
@@ -343,7 +344,8 @@ class TestOpsManager:
                     conn.execute(
                         """
                         INSERT INTO resource_metrics
-                        (id, tenant_id, resource_type, resource_id, metric_name, metric_value, unit, timestamp)
+                        (id, tenant_id, resource_type, resource_id, metric_name,
+                         metric_value, unit, timestamp)
                         VALUES (?, ?, ?, ?, ?, ?, ?, ?)
                     """,
                         (