chore: fix start/stop.sh to use this app's name, not the template's (frontend audit rank 15)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

start.sh

@@ -9,7 +9,7 @@ LOG_FILE=".demo.log"
 if [ -f "$PID_FILE" ]; then
   existing="$(cat "$PID_FILE")"
   if [ -n "$existing" ] && kill -0 "$existing" 2>/dev/null; then
-    echo "crema-app-aifirst-template already running (pid $existing)"
+    echo "arcadia-admin already running (pid $existing)"
     exit 0
   fi
   rm -f "$PID_FILE"
@@ -20,4 +20,4 @@ pid=$!
 echo "$pid" >"$PID_FILE"
 disown "$pid" 2>/dev/null || true
 
-echo "crema-app-aifirst-template started (pid $pid) — logs: $LOG_FILE"
+echo "arcadia-admin started (pid $pid) — logs: $LOG_FILE"