fix: auto-fix code issues (cron)

- 修复重复导入/字段
- 修复异常处理
- 修复PEP8格式问题 (816+ 处)
- 添加缺失的导入 (json, re)
- 统一SQL查询格式
- 修复赋值语句空格问题

修复文件:
- db_manager.py (96处)
- search_manager.py (77处)
- ops_manager.py (66处)
- developer_ecosystem_manager.py (68处)
- growth_manager.py (60处)
- enterprise_manager.py (61处)
- tenant_manager.py (57处)
- plugin_manager.py (48处)
- subscription_manager.py (46处)
- security_manager.py (29处)
- workflow_manager.py (32处)
- localization_manager.py (31处)
- api_key_manager.py (20处)
- ai_manager.py (23处)
- performance_manager.py (24处)
- neo4j_manager.py (25处)
- collaboration_manager.py (33处)
- test_phase8_task8.py (16处)
- test_phase8_task6.py (4处)
- knowledge_reasoner.py (添加import json)
- llm_client.py (添加import json)

backend/test_phase8_task8.py

@@ -198,7 +198,7 @@ class TestOpsManager:
             for channel in channels:
                 if channel.tenant_id == self.tenant_id:
                     with self.manager._get_db() as conn:
-                        conn.execute("DELETE FROM alert_channels WHERE id  = ?", (channel.id,))
+                        conn.execute("DELETE FROM alert_channels WHERE id = ?", (channel.id,))
                         conn.commit()
             self.log("Deleted test alert channels")
 
@@ -320,8 +320,8 @@ class TestOpsManager:
             # 清理
             self.manager.delete_alert_rule(rule.id)
             with self.manager._get_db() as conn:
-                conn.execute("DELETE FROM alerts WHERE id  = ?", (alert_id,))
-                conn.execute("DELETE FROM resource_metrics WHERE tenant_id  = ?", (self.tenant_id,))
+                conn.execute("DELETE FROM alerts WHERE id = ?", (alert_id,))
+                conn.execute("DELETE FROM resource_metrics WHERE tenant_id = ?", (self.tenant_id,))
                 conn.commit()
             self.log("Cleaned up test data")
 
@@ -381,8 +381,8 @@ class TestOpsManager:
 
             # 清理
             with self.manager._get_db() as conn:
-                conn.execute("DELETE FROM capacity_plans WHERE tenant_id  = ?", (self.tenant_id,))
-                conn.execute("DELETE FROM resource_metrics WHERE tenant_id  = ?", (self.tenant_id,))
+                conn.execute("DELETE FROM capacity_plans WHERE tenant_id = ?", (self.tenant_id,))
+                conn.execute("DELETE FROM resource_metrics WHERE tenant_id = ?", (self.tenant_id,))
                 conn.commit()
             self.log("Cleaned up capacity planning test data")
 
@@ -437,9 +437,9 @@ class TestOpsManager:
 
             # 清理
             with self.manager._get_db() as conn:
-                conn.execute("DELETE FROM scaling_events WHERE tenant_id  = ?", (self.tenant_id,))
+                conn.execute("DELETE FROM scaling_events WHERE tenant_id = ?", (self.tenant_id,))
                 conn.execute(
-                    "DELETE FROM auto_scaling_policies WHERE tenant_id  = ?", (self.tenant_id,)
+                    "DELETE FROM auto_scaling_policies WHERE tenant_id = ?", (self.tenant_id,)
                 )
                 conn.commit()
             self.log("Cleaned up auto scaling test data")
@@ -495,7 +495,7 @@ class TestOpsManager:
 
             # 清理
             with self.manager._get_db() as conn:
-                conn.execute("DELETE FROM health_checks WHERE tenant_id  = ?", (self.tenant_id,))
+                conn.execute("DELETE FROM health_checks WHERE tenant_id = ?", (self.tenant_id,))
                 conn.commit()
             self.log("Cleaned up health check test data")
 
@@ -550,8 +550,8 @@ class TestOpsManager:
 
             # 清理
             with self.manager._get_db() as conn:
-                conn.execute("DELETE FROM failover_events WHERE tenant_id  = ?", (self.tenant_id,))
-                conn.execute("DELETE FROM failover_configs WHERE tenant_id  = ?", (self.tenant_id,))
+                conn.execute("DELETE FROM failover_events WHERE tenant_id = ?", (self.tenant_id,))
+                conn.execute("DELETE FROM failover_configs WHERE tenant_id = ?", (self.tenant_id,))
                 conn.commit()
             self.log("Cleaned up failover test data")
 
@@ -604,8 +604,8 @@ class TestOpsManager:
 
             # 清理
             with self.manager._get_db() as conn:
-                conn.execute("DELETE FROM backup_records WHERE tenant_id  = ?", (self.tenant_id,))
-                conn.execute("DELETE FROM backup_jobs WHERE tenant_id  = ?", (self.tenant_id,))
+                conn.execute("DELETE FROM backup_records WHERE tenant_id = ?", (self.tenant_id,))
+                conn.execute("DELETE FROM backup_jobs WHERE tenant_id = ?", (self.tenant_id,))
                 conn.commit()
             self.log("Cleaned up backup test data")
 
@@ -686,14 +686,14 @@ class TestOpsManager:
             # 清理
             with self.manager._get_db() as conn:
                 conn.execute(
-                    "DELETE FROM cost_optimization_suggestions WHERE tenant_id  = ?",
+                    "DELETE FROM cost_optimization_suggestions WHERE tenant_id = ?",
                     (self.tenant_id,),
                 )
-                conn.execute("DELETE FROM idle_resources WHERE tenant_id  = ?", (self.tenant_id,))
+                conn.execute("DELETE FROM idle_resources WHERE tenant_id = ?", (self.tenant_id,))
                 conn.execute(
-                    "DELETE FROM resource_utilizations WHERE tenant_id  = ?", (self.tenant_id,)
+                    "DELETE FROM resource_utilizations WHERE tenant_id = ?", (self.tenant_id,)
                 )
-                conn.execute("DELETE FROM cost_reports WHERE tenant_id  = ?", (self.tenant_id,))
+                conn.execute("DELETE FROM cost_reports WHERE tenant_id = ?", (self.tenant_id,))
                 conn.commit()
             self.log("Cleaned up cost optimization test data")