fix(mudcraft): set voice_host so clients connect to correct UDP endpoint

Simple Voice Chat was advertising a blank voice_host, causing clients to
try connecting to the pod's internal IP over UDP. Explicitly set
voice_host=mudcraft.nook.family:24454 via ConfigMap + initContainer.

servers/legion/k8s/mudcraft/configmap-voicechat.yaml

@@ -0,0 +1,25 @@
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: mudcraft-voicechat
+  namespace: mudcraft
+data:
+  voicechat-server.properties: |
+    port=24454
+    bind_address=
+    max_voice_distance=48.0
+    whisper_distance=24.0
+    codec=VOIP
+    mtu_size=1024
+    tcp_rate_limit=16
+    keep_alive=1000
+    enable_groups=true
+    voice_host=mudcraft.nook.family:24454
+    allow_recording=true
+    spectator_interaction=false
+    spectator_player_possession=false
+    force_voice_chat=false
+    login_timeout=10000
+    broadcast_range=-1.0
+    allow_pings=true