feat(notify): 站内通知补齐完成、到期逾期与知识事件

backend/app/main.py

@@ -32,6 +32,7 @@ from .db import SessionFactory, current_app_role, engine
 from .errors import AppError, ErrorCode, http_status_for
 from .logging_setup import get_logger, request_id_ctx, setup_logging
 from .middleware import IdempotencyMiddleware, RequestContextMiddleware, error_body
+from .services import reminders
 from .services.wechat_bot import manager as wechat_manager
 
 settings = get_settings()
@@ -53,7 +54,10 @@ async def lifespan(app: FastAPI):
     )
     # 已登录的微信通道在进程启动时接上，不然重启之后消息就静默收不到了。
     await wechat_manager.start_all()
+    # 到期/逾期提醒：多 worker 下靠 advisory lock 保证只有一个进程在扫。
+    reminders.start()
     yield
+    await reminders.shutdown()
     await wechat_manager.shutdown()
     await engine.dispose()