feat: add structured Logger to dashboard.service, graceful shutdown, node version check (#835)

* feat: add Logger to dashboard.service.ts (#773)
feat: add graceful shutdown handler (#776)
feat: add Node.js version check on startup (#775)

* fix: resolve test failures and duplicate NestFactory.create in main.ts

---------

Co-authored-by: portable <emmanueltemitopedorcas20@gmail.com>

Author: tolulopedd26

src/dashboard/dashboard.service.ts

@@ -1,6 +1,6 @@
 // @ts-nocheck
 
-import { Injectable, NotFoundException } from '@nestjs/common';
+import { Injectable, NotFoundException, Logger } from '@nestjs/common';
 import { Decimal } from '@prisma/client/runtime/library';
 import { PrismaService } from '../database/prisma.service';
 import {
@@ -13,9 +13,12 @@ import {
 
 @Injectable()
 export class DashboardService {
+  private readonly logger = new Logger(DashboardService.name);
+
   constructor(private prisma: PrismaService) {}
 
   async getDashboard(userId: string): Promise<DashboardDto> {
+    this.logger.log(`Fetching dashboard for user ${userId}`);
     const [profile, stats, recentActivity, recommendations] = await Promise.all([
       this.getProfileSummary(userId),
       this.getQuickStats(userId),

src/main.ts

@@ -16,9 +16,18 @@ import { validateEnvironment } from './utils/validate-env';
 
 async function bootstrap() {
   validateEnvironment();
-  const app = await NestFactory.create(AppModule);
+
   const logger = new Logger('Bootstrap');
 
+  // Node.js version check (#775)
+  const nodeMajor = parseInt(process.versions.node.split('.')[0], 10);
+  if (nodeMajor < 18) {
+    logger.error(`Node.js >= 18 required, found ${process.versions.node}`);
+    process.exit(1);
+  }
+
+  const app = await NestFactory.create(AppModule);
+
   // Enable validation
   app.useGlobalPipes(
     new ValidationPipe({
@@ -69,6 +78,8 @@ async function bootstrap() {
   // Setup Swagger documentation
   setupSwagger(app);
 
+  app.enableShutdownHooks();
+
   const port = process.env.PORT || 3000;
   await app.listen(port);
   logger.log(`PropChain API running on http://localhost:${port}`);