feat(msg): 修复通知服务并添加ES降级与Push Gateway推送

database.ts 导出db常量替代getDb()函数

env.ts JWT_SECRET/ES_URL改optional加DEV_MODE/PUSH_GATEWAY_URL

elasticsearch.ts ES降级: ES_URL未设置时esClient=null

notifications.service.ts 加createBatch+分页查询+Push Gateway推送调用

新建msg-init.sql创建2张表

services/msg/src/app.module.ts

@@ -1,7 +1,10 @@
-import { Module } from '@nestjs/common';
-import { NotificationsModule } from './notifications/notifications.module.js';
+import { Module } from "@nestjs/common";
+import { NotificationsModule } from "./notifications/notifications.module.js";
+import { HealthModule } from "./shared/health/health.module.js";
+import { LifecycleService } from "./shared/lifecycle/lifecycle.service.js";
 
 @Module({
-  imports: [NotificationsModule],
+  imports: [NotificationsModule, HealthModule],
+  providers: [LifecycleService],
 })
 export class AppModule {}