feat(api): 搭建 API 与 Worker 骨架及契约基线

NestJS 11 + Fastify 统一错误体与 trace_id，/health 真实探活 DB/Redis，OpenAPI 3.1 契约含 20 个错误码；shared 包提供错误码、权限点、ULID、分页与通用 schema；worker 完成队列进程骨架。

apps/api/src/infra/infra.service.spec.ts

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+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { testConfig } from '../testing/test-app';
+import { PrismaService } from './prisma/prisma.service';
+import { RedisService } from './redis/redis.service';
+
+describe('PrismaService', () => {
+  it('关闭应用时断开 Prisma 连接', async () => {
+    const service = new PrismaService(testConfig);
+    const disconnect = vi.spyOn(service, '$disconnect').mockResolvedValue();
+    await service.onModuleDestroy();
+    expect(disconnect).toHaveBeenCalledTimes(1);
+  });
+});
+
+describe('RedisService', () => {
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it('ping 返回 PONG', async () => {
+    const service = new RedisService(testConfig);
+    const client = service.getClient();
+    vi.spyOn(client, 'connect').mockResolvedValue(undefined);
+    vi.spyOn(client, 'ping').mockResolvedValue('PONG');
+    await expect(service.ping()).resolves.toBe('PONG');
+  });
+
+  it('关闭应用时断开 Redis 连接', () => {
+    const service = new RedisService(testConfig);
+    const client = service.getClient();
+    const disconnect = vi.spyOn(client, 'disconnect').mockReturnValue(undefined);
+    service.onModuleDestroy();
+    expect(disconnect).toHaveBeenCalledTimes(1);
+  });
+});