feat: Add PM2 ecosystem configuration for production process management

[believetimothy]

Summary

Adds a PM2 ecosystem configuration file (ecosystem.config.js) for production process management, enabling cluster mode, auto-restart, memory-based restart, and log rotation.

Changes

• ecosystem.config.js — New PM2 ecosystem configuration with:
  • Cluster mode (exec_mode: "cluster", instances: "max") for multi-core utilization
  • Auto-restart on crash with configurable restart delay (4s) and max restarts (16)
  • Max-memory-restart at 1G threshold to prevent memory leaks
  • Log management with merged logs, timestamps, and pm2-logrotate module instructions (50MB rotation, 10 retained files, daily rotation, gzip compression)
  • Environment configuration for production (NODE_ENV, PORT)
  • Zero-downtime deployments via pm2 reload

Usage

# Start in production
pm2 start ecosystem.config.js --env production

# Reload all cluster instances with zero downtime
pm2 reload ecosystem.config.js --update-env

# Install log rotation module
pm2 install pm2-logrotate
pm2 set pm2-logrotate:max_size 50M
pm2 set pm2-logrotate:retain 10
pm2 set pm2-logrotate:compress true
pm2 set pm2-logrotate:rotateInterval '0 0 * * *'

Closes

• closes infra: Add PM2 ecosystem config #263
• closes infra: Implement distributed tracing (Jaeger/Zipkin) #265
• closes feat(admin): Add admin dashboard API endpoints #272

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