fix: correct Docker CMD to use root-level server.js

The Next.js standalone build outputs server.js to /app/server.js, not
/app/apps/web/server.js. This was causing the container to crash on
startup with MODULE_NOT_FOUND errors, resulting in 404s for abaci.one.

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

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

Dockerfile

@@ -50,4 +50,4 @@ ENV PORT 3000
 ENV HOSTNAME "0.0.0.0"
 
 # Start the application
-CMD ["node", "apps/web/server.js"]
+CMD ["node", "server.js"]