[Crash] Unchecked this.room.perm.inputCmd in chat message handler

[coderabbitai]

Summary

Game server crashes when this.room.perm is undefined during command processing.

Affected Code

server-game/src/client.js:345

if (text.startsWith("/")) {
  this.room.perm.inputCmd(this.player, text); // CRASH if this.room.perm is undefined

Vulnerability

If room initialization fails or race condition during shutdown, this.room.perm may be undefined.

Impact

• Game server crash when player types command
• Denial of service

Recommended Fix

if (text.startsWith("/")) {
  this.room.perm?.inputCmd(this.player, text);

References

• PR: New Blocks & Ported fancyMuzzle flash #43