feat(release): 固定启用香港异步 Worker

将生产 Worker 拓扑固定为宁波 1 个、香港 1 个，并让发布、容量配置和回滚流程持续保留香港 Worker。当前仍只使用宁波 PostgreSQL，关闭横向自动扩缩容，避免依赖数据库同步副本。

验证：API 全量 go test、迁移安全检查、cluster release helper、manual release、bash -n、ShellCheck、Kustomize 渲染均通过。

tests/release/cluster-release-helper-test.sh

@@ -41,6 +41,7 @@ kubectl=("$tmp/kubectl")
 NAMESPACE=easyai
 ACTIVE_RELEASE_SHA=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
 AI_GATEWAY_WORKER_REPLICAS_NINGBO=1
+AI_GATEWAY_WORKER_REPLICAS_HONGKONG=1
 AI_GATEWAY_ASYNC_WORKER_INSTANCE_HARD_LIMIT=24
 AI_GATEWAY_ASYNC_WORKER_HARD_LIMIT=48
 AI_GATEWAY_ASYNC_WORKER_GLOBAL_HARD_LIMIT=48
@@ -55,6 +56,8 @@ AI_GATEWAY_MEDIA_REQUEST_CONCURRENCY=24
 AI_GATEWAY_WORKER_AUTOSCALING_ENABLED=false
 AI_GATEWAY_WORKER_MIN_REPLICAS_NINGBO=1
 AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO=1
+AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG=1
+AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG=1
 AI_GATEWAY_WORKER_TARGET_OUTSTANDING_PER_REPLICA=48
 AI_GATEWAY_WORKER_CPU_REQUEST_MILLICORES=500
 AI_GATEWAY_WORKER_MEMORY_REQUEST_MIB=512
@@ -67,6 +70,10 @@ if rollout_worker_site ningbo 'registry.example.invalid/api@sha256:deadbeef' &&
   echo 'failed Worker rollout was reported as successful' >&2
   exit 1
 fi
+if rollout_worker_site hongkong 'registry.example.invalid/api@sha256:deadbeef' && true; then
+  echo 'failed Hong Kong Worker rollout was reported as successful' >&2
+  exit 1
+fi
 
 deployment_strategy() {
   local deployment=$1
@@ -86,12 +93,18 @@ grep -Fq '      maxSurge: 1' <<<"$strategy"
 grep -Fq '      maxUnavailable: 0' <<<"$strategy"
 
 grep -Fq 'name: easyai-api-hongkong' "$root/deploy/kubernetes/production/kustomization.yaml"
-grep -Fq 'name: easyai-worker-hongkong' "$root/deploy/kubernetes/production/kustomization.yaml"
 grep -Fq 'name: easyai-web-hongkong' "$root/deploy/kubernetes/production/kustomization.yaml"
-if grep -Fq 'AI_GATEWAY_WORKER_REPLICAS_HONGKONG=' \
-  "$root/deploy/kubernetes/easyai-ai-gateway-cluster-release.conf.example"; then
-  echo 'Hong Kong Worker capacity remains in the single-node release environment' >&2
+if grep -Fq 'name: easyai-worker-hongkong' \
+  "$root/deploy/kubernetes/production/kustomization.yaml"; then
+  echo 'Hong Kong Worker is still deleted from the production desired state' >&2
   exit 1
 fi
+grep -Fq 'AI_GATEWAY_WORKER_REPLICAS_HONGKONG=1' \
+  "$root/deploy/kubernetes/easyai-ai-gateway-cluster-release.conf.example"
+grep -Fq "hongkong) replicas=\$AI_GATEWAY_WORKER_REPLICAS_HONGKONG" "$helper"
+
+hongkong_strategy=$(deployment_strategy easyai-worker-hongkong)
+grep -Fq '  replicas: 1' <<<"$hongkong_strategy"
+grep -Fq 'easyai.io/worker-only' <<<"$hongkong_strategy"
 
 echo 'cluster_release_helper_tests=PASS'