```

refactor(core,ai): 调整模块导入路径并移除废弃文件

- 修复 scheduler.py 中的导入路径错误，将 reports.service
  改为 reports.services
- 移除废弃的 app/core/background/task_queue.py 文件
- 移除废弃的 app/modules/ai_agent/adapters.py 文件
- 修复 ai_memory/service.py 中的导入路径错误，将
  events.service 改为 events.services
```

app/tasks/events.py

@@ -0,0 +1,30 @@
+from socket import gethostname
+from typing import Any
+
+from app.core.constants import ActorValue
+from app.core.database import SessionLocal
+from app.tasks.app import celery_app, settings
+
+
+@celery_app.task(name="events.dispatch_pending")
+def dispatch_pending_events(
+    limit: int | None = None,
+    actor: str = ActorValue.WORKER,
+) -> list[dict[str, Any]]:
+    from app.modules.events.services import EventService
+    from app.modules.observability.constants import HeartbeatComponent
+    from app.modules.observability.service import ObservabilityService
+
+    db = SessionLocal()
+    try:
+        ObservabilityService(db).record_heartbeat(
+            component=HeartbeatComponent.WORKER,
+            instance_id=gethostname(),
+            actor=actor,
+        )
+        return EventService(db).dispatch_pending(
+            limit=limit or settings.event_dispatch_batch_size,
+            worker_id=f"{actor}:{gethostname()}",
+        )
+    finally:
+        db.close()