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/ops_manager.py

@@ -1690,7 +1690,8 @@ class OpsManager:
                 INSERT INTO auto_scaling_policies
                 (id, tenant_id, name, resource_type, min_instances, max_instances,
                  target_utilization, scale_up_threshold, scale_down_threshold,
-                 scale_up_step, scale_down_step, cooldown_period, is_enabled, created_at, updated_at)
+                 scale_up_step, scale_down_step, cooldown_period, is_enabled, created_at,
+                 updated_at)
                 VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
             """,
                 (
@@ -2153,7 +2154,8 @@ class OpsManager:
                 """
                 INSERT INTO failover_configs
                 (id, tenant_id, name, primary_region, secondary_regions, failover_trigger,
-                 auto_failover, failover_timeout, health_check_id, is_enabled, created_at, updated_at)
+                 auto_failover, failover_timeout, health_check_id, is_enabled, created_at,
+                 updated_at)
                 VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
             """,
                 (
@@ -2545,7 +2547,8 @@ class OpsManager:
             conn.execute(
                 """
                 INSERT INTO cost_reports
-                (id, tenant_id, report_period, total_cost, currency, breakdown, trends, anomalies, created_at)
+                (id, tenant_id, report_period, total_cost, currency, breakdown,
+                 trends, anomalies, created_at)
                 VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
             """,
                 (
@@ -2786,7 +2789,8 @@ class OpsManager:
                     """
                     INSERT INTO cost_optimization_suggestions
                     (id, tenant_id, category, title, description, potential_savings, currency,
-                     confidence, difficulty, implementation_steps, risk_level, is_applied, created_at)
+                     confidence, difficulty, implementation_steps, risk_level, is_applied,
+                     created_at)
                     VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
                 """,
                     (