fix(acceptance): 修复本地数据库身份标记

通过 psql 标准输入执行变量替换，并校验本地集群标识格式，确保安全标记在导入生产脱敏快照前可靠写入，避免验收编排因 -c 参数不展开变量而退出。\n\n验证：bash -n；ShellCheck；本地 CNPG 双实例实际写入与查询标记通过。

scripts/acceptance/local-cluster.sh

@@ -263,13 +263,14 @@ mark_local_database() {
   local primary
   primary=$(kubectl --context "$context" -n "$namespace" get cluster easyai-postgres \
     -o 'jsonpath={.status.currentPrimary}')
-  kubectl --context "$context" -n "$namespace" exec "$primary" -c postgres -- \
-    psql -X -v ON_ERROR_STOP=1 -U postgres -d easyai_ai_gateway \
-      -v cluster_id="$LOCAL_CLUSTER_ID" -c \
-      "INSERT INTO system_settings(setting_key,value)
-       VALUES('acceptance_local_cluster_id',jsonb_build_object('clusterId', :'cluster_id'))
-       ON CONFLICT(setting_key) DO UPDATE SET value=excluded.value,updated_at=now();" \
-      >/dev/null
+  [[ $LOCAL_CLUSTER_ID =~ ^easyai-local-[0-9a-f]{24}$ ]]
+  printf '%s\n' \
+    "INSERT INTO system_settings(setting_key,value)
+     VALUES('acceptance_local_cluster_id',jsonb_build_object('clusterId', :'cluster_id'))
+     ON CONFLICT(setting_key) DO UPDATE SET value=excluded.value,updated_at=now();" |
+    kubectl --context "$context" -n "$namespace" exec -i "$primary" -c postgres -- \
+      psql -X -v ON_ERROR_STOP=1 -U postgres -d easyai_ai_gateway \
+        -v cluster_id="$LOCAL_CLUSTER_ID" >/dev/null
 }
 
 import_snapshot() {