fix(acceptance): 按实际节点聚合多 Worker 指标

同站点存在多个物理节点时，按每个 Ready Pod 的 nodeName 映射真实 SSH 主机采集 metrics，并隔离 ssh 标准输入，避免吞掉后续 Pod 目标。所有 Worker Pod 指标按容量最小/最大、连接池最小/最大和计数器总和聚合，不再随机漏采一个实例。\n\n运行时门禁根据已启用的第四节点计算 Ready 节点数，并跳过零副本站点，同时继续逐 Pod 校验 P24/P28/P32 容量、连接池和租约。\n\n验证：bash -n、ShellCheck、双节点 metrics 映射测试、生产只读双 Worker metrics 探针、manual-release-test。

tests/release/production-acceptance-script-test.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# shellcheck disable=SC2034 # Variables are consumed by dynamically sourced functions.
+# shellcheck disable=SC2034,SC2329 # Symbols are consumed by dynamically sourced functions.
 set -euo pipefail
 
 root=$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)
@@ -46,7 +46,11 @@ if is_release_ancestor invalid "$third"; then
 fi
 
 remote_kubectl() {
-  printf 0
+  if [[ $* == *'get pods'* ]]; then
+    printf '{"items":[]}'
+  else
+    printf 0
+  fi
 }
 
 cluster_ssh() {
@@ -63,6 +67,32 @@ else
 fi
 [[ $metrics_status == 2 ]]
 
+remote_kubectl() {
+  printf '%s\n' '{"items":[
+    {"metadata":{},"spec":{"nodeName":"easyai-hongkong"},"status":{"podIP":"10.42.3.10","conditions":[{"type":"Ready","status":"True"}]}},
+    {"metadata":{},"spec":{"nodeName":"easyai-hongkong-worker-2"},"status":{"podIP":"10.42.5.10","conditions":[{"type":"Ready","status":"True"}]}}
+  ]}'
+}
+
+cluster_ssh() {
+  while IFS= read -r _; do :; done
+  printf '# target_host %s\n' "$1"
+  printf 'test_metric 1\n'
+}
+
+CLUSTER_NINGBO_HOST=root@ningbo.invalid
+CLUSTER_HONGKONG_HOST=root@hongkong.invalid
+CLUSTER_LOS_ANGELES_HOST=root@losangeles.invalid
+CLUSTER_WORKER_NODE_4_NAME=easyai-hongkong-worker-2
+CLUSTER_WORKER_NODE_4_HOST=root@hongkong-worker-2.invalid
+metrics=$(workload_metrics_for_site worker hongkong)
+grep -Fq '# target_host root@hongkong.invalid' <<<"$metrics"
+grep -Fq '# target_host root@hongkong-worker-2.invalid' <<<"$metrics"
+[[ $(grep -c '^test_metric 1$' <<<"$metrics") == 2 ]]
+[[ $(metric_min test_metric <<<"$metrics") == 1 ]]
+[[ $(metric_max test_metric <<<"$metrics") == 1 ]]
+[[ $(metric_sum test_metric <<<"$metrics") == 2 ]]
+
 long_running_load() {
   while :; do
     sleep 1