Switch server scripts to tmux for panel console access

Rewrite start-azeroth-servers.sh to launch auth/worldserver in named
tmux sessions instead of nohup/disown. Add kill-azeroth-servers.sh to
tear down sessions and stray processes. Update vps-update-server.sh
with a --restart flag that stops servers before compile and restarts
them in tmux after.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/kill-azeroth-servers.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+# Kill AzerothCore authserver + worldserver tmux sessions and any stray processes.
+#
+# Usage:
+#   bash scripts/kill-azeroth-servers.sh
+
+set -euo pipefail
+
+AUTH_SESSION="authserver"
+WORLD_SESSION="worldserver"
+
+echo "Stopping servers..."
+
+# Kill tmux sessions
+if tmux has-session -t "$WORLD_SESSION" 2>/dev/null; then
+  tmux kill-session -t "$WORLD_SESSION"
+  echo "  killed tmux session: $WORLD_SESSION"
+else
+  echo "  no tmux session: $WORLD_SESSION"
+fi
+
+if tmux has-session -t "$AUTH_SESSION" 2>/dev/null; then
+  tmux kill-session -t "$AUTH_SESSION"
+  echo "  killed tmux session: $AUTH_SESSION"
+else
+  echo "  no tmux session: $AUTH_SESSION"
+fi
+
+# Clean up any stray processes not managed by tmux
+if pkill -x worldserver 2>/dev/null; then
+  echo "  killed stray worldserver process"
+fi
+if pkill -x authserver 2>/dev/null; then
+  echo "  killed stray authserver process"
+fi
+
+echo "Done."