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/testing/test-app.ts

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+import { API_PREFIX, ErrorCode } from '@lingxi/shared';
+import { Controller, Get, NotFoundException } from '@nestjs/common';
+import { FastifyAdapter, type NestFastifyApplication } from '@nestjs/platform-fastify';
+import { Test } from '@nestjs/testing';
+import { type Mock, vi } from 'vitest';
+
+import { AppException } from '../common/errors/app-exception';
+import { AllExceptionsFilter } from '../common/filters/all-exceptions.filter';
+import { APP_CONFIG } from '../config/config.module';
+import type { AppConfig } from '../config/env';
+import { PRISMA, REDIS } from '../infra/tokens';
+import { HealthController } from '../modules/platform/health/health.controller';
+import { HealthService } from '../modules/platform/health/health.service';
+
+export const testConfig: AppConfig = {
+  nodeEnv: 'test',
+  isProduction: false,
+  port: 3000,
+  host: '127.0.0.1',
+  logLevel: 'error',
+  databaseUrl: 'postgresql://lingxi:lingxi@127.0.0.1:15432/lingxi_test',
+  redisUrl: 'redis://127.0.0.1:16379',
+  webOrigins: ['http://127.0.0.1:5173'],
+  maxUploadMb: 500,
+  featureVideo: false,
+};
+
+@Controller('__test')
+class ThrowingController {
+  @Get('app-error')
+  appError(): never {
+    throw new AppException({ code: ErrorCode.STATE_NOT_ALLOWED, message: '当前状态不允许该操作' });
+  }
+
+  @Get('http-404')
+  notFound(): never {
+    throw new NotFoundException('资源不存在');
+  }
+
+  @Get('boom')
+  boom(): never {
+    throw new Error('unexpected failure');
+  }
+}
+
+export interface TestAppOptions {
+  databaseUp?: boolean;
+  redisUp?: boolean;
+  includeErrorRoutes?: boolean;
+}
+
+export interface TestApp {
+  app: NestFastifyApplication;
+  prisma: { $queryRaw: Mock };
+  redis: { ping: Mock };
+}
+
+export async function createTestApp(options: TestAppOptions = {}): Promise<TestApp> {
+  const prisma = {
+    $queryRaw:
+      options.databaseUp === false
+        ? vi.fn().mockRejectedValue(new Error('connect ECONNREFUSED 127.0.0.1:15432'))
+        : vi.fn().mockResolvedValue([{ '?column?': 1 }]),
+  };
+  const redis = {
+    ping:
+      options.redisUp === false
+        ? vi.fn().mockRejectedValue(new Error('connect ECONNREFUSED 127.0.0.1:16379'))
+        : vi.fn().mockResolvedValue('PONG'),
+  };
+
+  const moduleRef = await Test.createTestingModule({
+    controllers:
+      options.includeErrorRoutes === true
+        ? [HealthController, ThrowingController]
+        : [HealthController],
+    providers: [
+      HealthService,
+      { provide: PRISMA, useValue: prisma },
+      { provide: REDIS, useValue: redis },
+      { provide: APP_CONFIG, useValue: testConfig },
+    ],
+  }).compile();
+
+  const app = moduleRef.createNestApplication<NestFastifyApplication>(new FastifyAdapter());
+  app.setGlobalPrefix(API_PREFIX, { exclude: ['health'] });
+  app.useGlobalFilters(new AllExceptionsFilter());
+  await app.init();
+
+  return { app, prisma, redis };
+}