fix: correct cleanup service order in dev.sh

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/dev.sh

@@ -21,7 +21,7 @@ cleanup() {
     fi
 
     # 清理所有 PID 文件并杀服务进程
-    for service in activityService galleryService socialService assetService userService gateway; do
+    for service in gateway activityService galleryService socialService assetService userService; do
         pkill -9 -f "$service" 2>/dev/null || true
         rm -f "/tmp/dev_sh_${service}.pid" "/tmp/dev_sh_${service}_restart"
         echo -e "${YELLOW}  🛑 $service 已停止${NC}"