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/shared/errors/global-error.filter.ts

@@ -1,7 +1,12 @@
-import { Catch, ExceptionFilter, ArgumentsHost, HttpException, Logger } from '@nestjs/common';
-import { Request, Response } from 'express';
-import { ZodError } from 'zod';
-import { ApplicationError } from './application-error.js';
+import {
+  Catch,
+  ExceptionFilter,
+  ArgumentsHost,
+  HttpException,
+  Logger,
+} from "@nestjs/common";
+import { ZodError } from "zod";
+import { ApplicationError } from "./application-error.js";
 
 @Catch()
 export class GlobalErrorFilter implements ExceptionFilter {
@@ -9,10 +14,13 @@ export class GlobalErrorFilter implements ExceptionFilter {
 
   catch(exception: unknown, host: ArgumentsHost): void {
     const ctx = host.switchToHttp();
-    const response = ctx.getResponse<Response>();
-    const request = ctx.getRequest<Request>();
+    // NestJS HttpArgumentsHost 的 getResponse/getRequest 返回 express 实例，
+    // 但 msg 服务未引入 @types/express，此处按 core-edu / content 模式不显式标注类型。
+    const response = ctx.getResponse();
+    const request = ctx.getRequest();
 
-    const traceId = (request.headers['x-request-id'] as string | undefined) ?? 'unknown';
+    const traceId =
+      (request.headers["x-request-id"] as string | undefined) ?? "unknown";
 
     let statusCode = 500;
     let body: Record<string, unknown>;
@@ -27,8 +35,8 @@ export class GlobalErrorFilter implements ExceptionFilter {
       body = {
         success: false,
         error: {
-          code: 'MSG_VALIDATION_ERROR',
-          message: 'Validation failed',
+          code: "MSG_VALIDATION_ERROR",
+          message: "Validation failed",
           details: exception.flatten(),
           traceId,
         },
@@ -40,7 +48,7 @@ export class GlobalErrorFilter implements ExceptionFilter {
       body = {
         success: false,
         error: {
-          code: 'HTTP_ERROR',
+          code: "HTTP_ERROR",
           message,
           traceId,
         },
@@ -53,8 +61,8 @@ export class GlobalErrorFilter implements ExceptionFilter {
       body = {
         success: false,
         error: {
-          code: 'INTERNAL_ERROR',
-          message: 'An unexpected error occurred',
+          code: "INTERNAL_ERROR",
+          message: "An unexpected error occurred",
           traceId,
         },
       };
@@ -63,14 +71,17 @@ export class GlobalErrorFilter implements ExceptionFilter {
     response.status(statusCode).json(body);
   }
 
-  private extractHttpMessage(res: string | object, exception: HttpException): string {
-    if (typeof res === 'string') {
+  private extractHttpMessage(
+    res: string | object,
+    exception: HttpException,
+  ): string {
+    if (typeof res === "string") {
       return res;
     }
-    if (res && typeof res === 'object' && 'message' in res) {
+    if (res && typeof res === "object" && "message" in res) {
       // 从 HttpException 响应体收窄类型（NestJS 约定包含 message 字段）
       const msg = (res as { message: unknown }).message;
-      return typeof msg === 'string' ? msg : exception.message;
+      return typeof msg === "string" ? msg : exception.message;
     }
     return exception.message;
   }