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/config/env.ts

@@ -1,16 +1,22 @@
-import { z } from 'zod';
+import { z } from "zod";
 
 const envSchema = z.object({
-  PORT: z.string().default('3007'),
+  PORT: z.string().default("3007"),
   DATABASE_URL: z.string().url(),
   REDIS_URL: z.string().url().optional(),
-  JWT_SECRET: z.string(),
-  JWT_ISSUER: z.string().default('next-edu-cloud'),
-  KAFKA_BROKERS: z.string().default('localhost:9092'),
-  ES_URL: z.string().url().default('http://localhost:9200'),
+  JWT_SECRET: z.string().optional(),
+  JWT_ISSUER: z.string().default("next-edu-cloud"),
+  KAFKA_BROKERS: z.string().default("localhost:9092"),
+  ES_URL: z.string().url().optional(),
+  PUSH_GATEWAY_URL: z.string().url().optional(),
   OTEL_EXPORTER_OTLP_ENDPOINT: z.string().url().optional(),
-  LOG_LEVEL: z.enum(['fatal', 'error', 'warn', 'info', 'debug', 'trace']).default('info'),
-  NODE_ENV: z.enum(['development', 'production', 'test']).default('development'),
+  LOG_LEVEL: z
+    .enum(["fatal", "error", "warn", "info", "debug", "trace"])
+    .default("info"),
+  NODE_ENV: z
+    .enum(["development", "production", "test"])
+    .default("development"),
+  DEV_MODE: z.string().optional().default("false"),
 });
 
 export type Env = z.infer<typeof envSchema>;
@@ -18,8 +24,11 @@ export type Env = z.infer<typeof envSchema>;
 export function loadEnv(): Env {
   const result = envSchema.safeParse(process.env);
   if (!result.success) {
-    console.error('❌ Invalid environment variables:', result.error.flatten().fieldErrors);
-    throw new Error('Invalid environment configuration');
+    console.error(
+      "❌ Invalid environment variables:",
+      result.error.flatten().fieldErrors,
+    );
+    throw new Error("Invalid environment configuration");
   }
   return result.data;
 }