feat: bootstrap from Fabric monorepo

src/main.ts

@@ -0,0 +1,56 @@
+import 'reflect-metadata';
+import { ValidationPipe } from '@nestjs/common';
+import { NestFactory } from '@nestjs/core';
+import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
+import { AppModule } from './app.module';
+import { createRequestContextMiddleware } from './common/request-context.middleware';
+import { MetricsService } from './common/metrics.service';
+
+function requireEnv(name: string): string {
+  const value = process.env[name];
+  if (!value || value.trim() === '') {
+    throw new Error(`Missing required env: ${name}`);
+  }
+  return value;
+}
+
+function validateEnv(): void {
+  requireEnv('DB_HOST');
+  requireEnv('DB_PORT');
+  requireEnv('DB_USER');
+  requireEnv('DB_PASSWORD');
+  requireEnv('DB_NAME');
+  requireEnv('CENTER_SHARED_SECRET');
+  requireEnv('JWT_ACCESS_SECRET');
+  requireEnv('JWT_REFRESH_SECRET');
+}
+
+async function bootstrap() {
+  validateEnv();
+
+  const app = await NestFactory.create(AppModule);
+  app.setGlobalPrefix('api');
+  const metrics = app.get(MetricsService);
+  app.use(createRequestContextMiddleware('center', metrics));
+  app.useGlobalPipes(
+    new ValidationPipe({
+      whitelist: true,
+      forbidNonWhitelisted: true,
+      transform: true,
+    }),
+  );
+
+  const swaggerConfig = new DocumentBuilder()
+    .setTitle('Fabric Backend Center API')
+    .setDescription('Identity Hub APIs for Fabric')
+    .setVersion('1.0.0')
+    .build();
+  const swaggerDoc = SwaggerModule.createDocument(app, swaggerConfig);
+  SwaggerModule.setup('docs', app, swaggerDoc);
+
+  const port = process.env.PORT ? Number(process.env.PORT) : 7001;
+  await app.listen(port);
+  console.log(`Fabric.Backend.Center listening on :${port}`);
+}
+
+void bootstrap();