feat: NATS 连接与 JetStream 流引导（BPOS_EVT/CMD/DLQ）＋touch 发布

test/unit/health.test.ts

@@ -1,12 +1,23 @@
-import { describe, expect, it } from 'vitest';
+import { describe, expect, it, vi } from 'vitest';
+
+// 单测不碰真实总线：mock 掉 bus/nats，真实模块（及其 NATS 连接）永不求值
+vi.mock('../../src/shared/bus/nats', () => ({
+  checkNats: async () => 'ok' as const,
+}));
+
 import { buildApp } from '../../src/app/app';
 
 describe('health', () => {
-  it('无探活项时返回 200 ok', async () => {
+  it('nats 探活 ok（mock）时返回 200', async () => {
     const res = await buildApp().request('/health');
     expect(res.status).toBe(200);
-    const body = (await res.json()) as { ok: boolean; service: string };
+    const body = (await res.json()) as {
+      ok: boolean;
+      service: string;
+      checks: Record<string, string>;
+    };
     expect(body.ok).toBe(true);
     expect(body.service).toMatch(/^bpos-service-/);
+    expect(body.checks['nats']).toBe('ok');
   });
 });