fix: kubectl本地打包避docker下载超时; Service关联用spec.selector而非metadata.labels; 数据源兼容SvcSummary/IngSummary格式

backend/Dockerfile

@@ -83,10 +83,9 @@ RUN sed -i 's|dl-cdn.alpinelinux.org|mirrors.tuna.tsinghua.edu.cn|g' /etc/apk/re
 RUN --mount=type=cache,target=/var/cache/apk \
     apk add ca-certificates tzdata bash curl git docker-cli docker-cli-buildx
 
-# kubectl 预装（~50MB，国内网络从 dl.k8s.io 下载约10s）// Logan.Li
-ARG KUBECTL_VERSION=v1.32.0
-RUN curl -sLo /usr/local/bin/kubectl https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl && \
-    chmod +x /usr/local/bin/kubectl
+# kubectl 预装（~50MB，本地打包进镜像，避免 Docker build 时网络下载）// Logan.Li
+COPY backend/kubectl /usr/local/bin/kubectl
+RUN chmod +x /usr/local/bin/kubectl
 
 # npm 淘宝镜像加速（node 懒加载后生效）
 RUN npm config set registry https://registry.npmmirror.com 2>/dev/null || true