fix(1978): fix xiaoxia-gpu-worker.service bad unit file & log path permissions

- User=%i -> User=ying (%%i is template-only specifier, not valid here)
- After=musetalk.service -> After=musetalk-worker.service (match actual service name)
- Log path from /tmp/ to $HOME/ to avoid permission issues for ying user

deploy/gpu_worker/scripts/setup-gpu-node.sh

@@ -59,4 +59,5 @@ echo "  sudo systemctl status musetalk-worker"
 echo "  sudo systemctl status xiaoxia-gpu-worker"
 echo "  sudo systemctl status gpu-poll.timer"
 echo "健康检查：curl http://127.0.0.1:7861/health"
-echo "更新日志：tail -f /tmp/gpu-worker-update.log"
+echo "更新日志：tail -f ~/gpu-worker-update.log"
+echo "轮询日志：tail -f ~/gpu-poll.log"