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/main.ts

@@ -1,31 +1,50 @@
-import 'reflect-metadata';
-import { NestFactory } from '@nestjs/core';
-import { AppModule } from './app.module.js';
-import { GlobalErrorFilter } from './shared/errors/global-error.filter.js';
-import { initTracer, shutdownTracer } from './shared/observability/tracer.js';
-import { env } from './config/env.js';
-import { logger } from './shared/observability/logger.js';
+import "reflect-metadata";
+import { NestFactory } from "@nestjs/core";
+import { AppModule } from "./app.module.js";
+import { GlobalErrorFilter } from "./shared/errors/global-error.filter.js";
+import { initTracer, shutdownTracer } from "./shared/observability/tracer.js";
+import { env } from "./config/env.js";
+import { logger } from "./shared/observability/logger.js";
+import { checkEsConnection, closeEs } from "./config/elasticsearch.js";
+import { closeDb } from "./config/database.js";
 
 async function bootstrap(): Promise<void> {
   initTracer();
 
+  // ES 探活：未配置或失败时进入降级模式，不阻断启动。
+  await checkEsConnection();
+
   const app = await NestFactory.create(AppModule, {
-    logger: ['log', 'error', 'warn'],
+    logger: ["log", "error", "warn"],
   });
 
+  // 无全局路由前缀：Gateway 会去掉 /api/v1，再转发至本服务。
   app.useGlobalFilters(new GlobalErrorFilter());
   app.enableShutdownHooks();
 
   await app.listen(env.PORT);
-  logger.info({ port: env.PORT }, 'Msg service started');
+  logger.info({ port: env.PORT }, "Msg service started");
 
-  process.on('SIGTERM', async () => {
+  process.on("SIGTERM", async () => {
+    logger.info("SIGTERM received, shutting down gracefully...");
     await app.close();
+    await closeEs();
+    await closeDb();
     await shutdownTracer();
+    process.exit(0);
+  });
+
+  process.on("SIGINT", async () => {
+    logger.info("SIGINT received, shutting down gracefully...");
+    await app.close();
+    await closeEs();
+    await closeDb();
+    await shutdownTracer();
+    process.exit(0);
   });
 }
 
-bootstrap().catch((err: unknown) => {
-  logger.error({ err }, 'Failed to start msg service');
+void bootstrap().catch((err: unknown) => {
+  logger.error({ err }, "Failed to start msg service");
   process.exit(1);
 });