Install production build toolchain in provision

jenkins/Jenkinsfile.production-api-build

@@ -64,6 +64,10 @@ pipeline {
             set -euo pipefail
             chmod +x scripts/jenkins-prepare-cargo-env.sh
             source scripts/jenkins-prepare-cargo-env.sh
+            if ! command -v clang >/dev/null 2>&1 || ! command -v lld >/dev/null 2>&1; then
+              echo "[api-build] 缺少 clang/lld。请先运行 Genarrative-Server-Provision 安装 Linux 构建依赖。" >&2
+              exit 1
+            fi
             if ! command -v sccache >/dev/null 2>&1; then
               echo "[api-build] 未找到 sccache，改用 rustc 直接构建。"
               unset RUSTC_WRAPPER