Initial commit: self-hosted Docker setup for OpenFrontIO

Includes docker-compose, setup script, nginx reverse proxy docs,
and GAME_ENV configuration notes for self-hosted deployments.

supervisord-local.conf

@@ -0,0 +1,25 @@
+[supervisord]
+nodaemon=true
+user=root
+logfile=/var/log/supervisor/supervisord.log
+pidfile=/var/run/supervisord.pid
+
+[program:nginx]
+command=/usr/sbin/nginx -g "daemon off;"
+autostart=true
+autorestart=true
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0
+
+[program:node]
+command=npm run start:server
+directory=/usr/src/app
+autostart=true
+autorestart=true
+user=node
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0