Add market close updates and update deployment path for Compose Manager

Bot enhancements:
- Add scheduled update at market close (4:00 PM ET on trading days)
- Implement is_trading_day() method to check weekdays/holidays
- Market close update sends PYPL price at end of trading day

Deployment changes:
- Update all scripts to use Docker Compose Manager plugin path
- New path: /boot/config/plugins/compose.manager/projects/discord-stock-bot
- Container now integrates with Unraid Docker UI Compose section
- Update documentation with plugin integration details

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

setup-unraid.sh

@@ -4,7 +4,7 @@
 set -e
 
 UNRAID_HOST="${UNRAID_HOST:-root@192.168.2.61}"
-REMOTE_PATH="/mnt/user/docker/custom-dockers/discord-stock-bot"
+REMOTE_PATH="/boot/config/plugins/compose.manager/projects/discord-stock-bot"
 
 echo "Setting up Unraid server for git-based deployment..."
 echo ""