refactor(knowledge): migrate deleted-item cleanup from polling scheduler to event-driven worker

Replaces the scheduler-polled KnowledgeDeletedCleanupWorker with an
event-driven KnowledgeDeletedCleanupEventWorker in tenant-api; cleanup
events are now enqueued transactionally at delete time instead of swept
periodically. Also fixes statement_timeout parameterization in
MonitoringRetentionWorker and propagates errors from cleanupDeletedKnowledgeItem.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

server/migrations_ops/20260520120000_create_scheduler_control_tables.up.sql

@@ -93,7 +93,6 @@ VALUES
     ('monitoring_result_recovery', '监控结果恢复', 'monitoring', '恢复已回调但未成功进入结果队列的监控采集结果。', true, 'interval', 60, 'Asia/Shanghai', 30, 100, '{}'::jsonb),
     ('monitoring_lease_recovery', '监控租约回收', 'monitoring', '回收超过租约时间仍未回调的监控采集任务。', true, 'interval', 1800, 'Asia/Shanghai', 30, NULL, '{}'::jsonb),
     ('monitoring_received_inspection', '监控 received 卡死检查', 'monitoring', '检查长时间停留在 received 状态的监控任务。', true, 'interval', 300, 'Asia/Shanghai', 30, 100, '{}'::jsonb),
-    ('knowledge_deleted_cleanup', '知识库删除清理', 'knowledge', '清理已删除知识库条目的异步对象与向量数据。', true, 'interval', 15, 'Asia/Shanghai', 30, NULL, '{}'::jsonb),
     ('generation_state_check', '生成任务状态巡检', 'generation', '低频巡检文章生成任务与文章状态一致性。', true, 'interval', 300, 'Asia/Shanghai', 10, 100, '{}'::jsonb),
     ('monitoring_retention_cleanup', '监控历史保留清理', 'monitoring', '按业务日期清理最近 30 天窗口以前的监控历史数据。', true, 'interval', 86400, 'Asia/Shanghai', 900, 5000,
      '{"retention_days":30,"batch_size":5000,"max_batches_per_run":200,"dry_run":false,"statement_timeout":"5s","run_at_local":"02:30"}'::jsonb)

server/migrations_ops/20260520123000_remove_knowledge_deleted_cleanup_scheduler_job.down.sql

@@ -0,0 +1,5 @@
+INSERT INTO ops.scheduler_jobs
+    (job_key, display_name, category, description, enabled, schedule_type, interval_seconds, timezone, timeout_seconds, batch_size, config)
+VALUES
+    ('knowledge_deleted_cleanup', '知识库删除清理', 'knowledge', '清理已删除知识库条目的异步对象与向量数据。', true, 'interval', 15, 'Asia/Shanghai', 30, NULL, '{}'::jsonb)
+ON CONFLICT (job_key) DO NOTHING;

server/migrations_ops/20260520123000_remove_knowledge_deleted_cleanup_scheduler_job.up.sql

@@ -0,0 +1,8 @@
+DELETE FROM ops.scheduler_job_triggers
+WHERE job_key = 'knowledge_deleted_cleanup';
+
+DELETE FROM ops.scheduler_job_runs
+WHERE job_key = 'knowledge_deleted_cleanup';
+
+DELETE FROM ops.scheduler_jobs
+WHERE job_key = 'knowledge_deleted_cleanup';