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/elasticsearch.ts

@@ -1,13 +1,87 @@
-import { Client } from '@elastic/elasticsearch';
-import { env } from './env.js';
+import { Client } from "@elastic/elasticsearch";
+import { env } from "./env.js";
 
-export const esClient = new Client({ node: env.ES_URL });
+/**
+ * Elasticsearch 客户端。
+ *
+ * 降级模式：当 ES_URL 未设置或连接失败时，esClient 为 null，
+ * 所有 ES 操作通过 safeIndex / safeSearch 自动跳过，服务仍可启动。
+ */
+export const esClient: Client | null = env.ES_URL
+  ? new Client({ node: env.ES_URL })
+  : null;
 
+/**
+ * 探活 ES 连接。失败仅记录日志，不抛错（降级模式）。
+ */
 export async function checkEsConnection(): Promise<void> {
+  if (!esClient) {
+    console.log("Elasticsearch disabled (ES_URL not set)");
+    return;
+  }
   try {
     await esClient.ping();
-    console.log('Elasticsearch connected');
+    console.log("Elasticsearch connected");
   } catch (err) {
-    console.error('Elasticsearch connection failed:', err);
+    console.error("Elasticsearch connection failed:", err);
+  }
+}
+
+/**
+ * 关闭 ES 客户端连接。
+ */
+export async function closeEs(): Promise<void> {
+  if (esClient) {
+    await esClient.close();
+  }
+}
+
+export interface IndexParams {
+  index: string;
+  id: string;
+  document: Record<string, unknown>;
+}
+
+export interface SearchHit {
+  _id: string;
+  _source: Record<string, unknown>;
+}
+
+export interface SearchResult {
+  hits: SearchHit[];
+}
+
+/**
+ * 安全索引文档。client 为 null 或失败时跳过（降级模式），返回是否成功。
+ */
+export async function safeIndex(params: IndexParams): Promise<boolean> {
+  if (!esClient) return false;
+  try {
+    await esClient.index(params);
+    return true;
+  } catch (err) {
+    console.error("Elasticsearch index failed:", err);
+    return false;
+  }
+}
+
+/**
+ * 安全搜索。client 为 null 或失败时返回空数组（降级模式）。
+ */
+export async function safeSearch(
+  index: string,
+  query: Record<string, unknown>,
+): Promise<SearchResult> {
+  if (!esClient) return { hits: [] };
+  try {
+    const result = await esClient.search({ index, query });
+    const hits = (result.hits.hits as unknown[]).map((raw) => {
+      const hit = raw as { _id: string; _source: Record<string, unknown> };
+      return { _id: hit._id, _source: hit._source };
+    });
+    return { hits };
+  } catch (err) {
+    console.error("Elasticsearch search failed:", err);
+    return { hits: [] };
   }
 }