feat: add PM2-compatible entry point (src/bot.js) and ecosystem config

- src/bot.js: same logic as index.js but no blessed TUI; writes plain
  text to stdout so pm2 logs works cleanly on VPS
- ecosystem.config.cjs: pm2 config with live/sim envs, log files at
  logs/out.log + logs/error.log, auto-restart policy
- logs/.gitkeep: track the logs/ dir (*.log files are gitignored)
- package.json: added bot / bot-sim / bot-dev scripts

Usage on VPS:
  pm2 start ecosystem.config.cjs            # live
  pm2 start ecosystem.config.cjs --env sim  # simulation
  pm2 logs polymarket-copy

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -7,6 +7,9 @@
   "scripts": {
     "start": "node src/index.js",
     "dev": "nodemon --ignore 'data/*.json' src/index.js",
+    "bot": "node src/bot.js",
+    "bot-sim": "DRY_RUN=true node src/bot.js",
+    "bot-dev": "DRY_RUN=true nodemon --ignore 'data/*.json' src/bot.js",
     "mm": "DRY_RUN=false node src/mm.js",
     "mm-sim": "DRY_RUN=true node src/mm.js",
     "mm-dev": "DRY_RUN=true nodemon --ignore 'data/*.json' src/mm.js",