chore: add deployment configuration for PM2 and production environment

- Add deploy.sh script for automated deployment via rsync
- Add ecosystem.config.js for PM2 process management (2 instances)
- Add .env.production.example as production env template
- Update config.module.ts to support .env.production file
- Add 'pnpm run deploy' script to package.json

src/config/config.module.ts

@@ -10,7 +10,7 @@ import { validateEnvironment } from './env.validation';
       isGlobal: true,
       load: [databaseConfig],
       validate: validateEnvironment,
-      envFilePath: ['.env.local', '.env'],
+      envFilePath: ['.env.local', '.env.production', '.env'],
     }),
   ],
   exports: [ConfigModule],