chore: fallback to docker build in deploy script

deploy/deploy-dev.sh

@@ -21,7 +21,11 @@ echo "    完成: dist/ ($(du -sh dist | cut -f1))"
 TAG=$(date +%Y%m%d%H%M%S)
 IMAGE="${IMAGE_REPO}:${TAG}"
 echo "==> [2/4] 构建镜像 $IMAGE ..."
-docker buildx build --platform linux/amd64 -f deploy/Dockerfile -t "$IMAGE" --load .
+if docker buildx version >/dev/null 2>&1; then
+  docker buildx build --platform linux/amd64 -f deploy/Dockerfile -t "$IMAGE" --load .
+else
+  docker build -f deploy/Dockerfile -t "$IMAGE" .
+fi
 echo "    镜像构建完成"
 
 # 3. 推送到 Harbor