fix: harden backend production deployment

src/app.service.ts

@@ -2,6 +2,8 @@ import { Injectable } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
 import { AppStatusResponseDto } from './business/shared';
 
+const packageJson: { version: string } = require('../package.json');
+
 /**
  * 应用服务类
  *
@@ -31,7 +33,7 @@ export class AppService {
 
     return {
       service: 'Pixel Game Server',
-      version: '1.1.1',
+      version: packageJson.version,
       status: 'running',
       timestamp: new Date().toISOString(),
       uptime: Math.floor((Date.now() - this.startTime) / 1000),