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

ecosystem.config.js

@@ -0,0 +1,27 @@
+module.exports = {
+  apps: [
+    {
+      name: 'mememind-server',
+      script: 'dist/main.js',
+      instances: 2,
+      exec_mode: 'cluster',
+      autorestart: true,
+      watch: false,
+      max_memory_restart: '1G',
+      env: {
+        NODE_ENV: 'production',
+        PORT: 3000,
+      },
+      env_production: {
+        NODE_ENV: 'production',
+        PORT: 3000,
+      },
+      error_file: './logs/error.log',
+      out_file: './logs/out.log',
+      log_file: './logs/combined.log',
+      time: true,
+      merge_logs: true,
+      log_date_format: 'YYYY-MM-DD HH:mm:ss Z',
+    },
+  ],
+};