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

package.json

@@ -17,7 +17,8 @@
     "test:watch": "jest --watch",
     "test:cov": "jest --coverage",
     "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
-    "test:e2e": "jest --config ./test/jest-e2e.json"
+    "test:e2e": "jest --config ./test/jest-e2e.json",
+    "deploy": "bash deploy.sh"
   },
   "dependencies": {
     "@nestjs/common": "^11.0.1",