ports: forward UDP/2603 to fix DR XP reports

DR_Server binds UDP/2603 in addition to TCP/2603 — that's where the
DSOUND.dll mod's NAT-punched XP-report socket sends client kill XP
back to the server (see ChatCommandHandler.cs / [DLL XP REPORT] path
in the source). The original forward was tcp-only, so every WAN
client's UDP XP packet was dropped at the router. Symptom: every
character stuck at lvl 1/xp 0 regardless of how the client launched.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ports.toml

@@ -53,7 +53,7 @@ protocol = "tcp"
 [[forward]]
 name = "DR game"
 port = 2603
-protocol = "tcp"
+protocol = "both"
 
 [[forward]]
 name = "DR aux UDP"