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

.env.production.example

@@ -0,0 +1,12 @@
+# 生产环境配置
+# 复制此文件为 .env.production 并修改配置
+
+NODE_ENV=production
+PORT=3000
+
+# 数据库配置
+DB_HOST=localhost
+DB_PORT=3306
+DB_USERNAME=your_db_username
+DB_PASSWORD=your_db_password
+DB_DATABASE=meme_mind