feat(deploy): 切换宁波单节点生产拓扑

移除已停用的香港 API、Web、Worker 和边缘 Service 渲染结果，将 Worker 与容量控制器固定到宁波单实例，并在发布成功后清理旧香港资源。\n\n容量控制器忽略最大副本为零的站点，集群环境允许不再声明香港主机；单节点 production acceptance 不再依赖香港 Service、Deployment 或 SSH 回退。\n\n验证：Go 全量测试与 go vet；迁移安全检查；Kustomize 单节点渲染；ShellCheck；cluster release、production acceptance 和 manual release 测试。

apps/api/internal/capacitycontroller/controller.go

@@ -140,12 +140,15 @@ func (controller *Controller) reconcile(ctx context.Context) error {
 	sites := make([]SiteResources, 0, 2)
 	kubernetesStates := make(map[string]KubernetesSiteState, 2)
 	for _, site := range []string{"ningbo", "hongkong"} {
+		minReplicas, maxReplicas := controller.siteReplicaBounds(site)
+		if maxReplicas == 0 {
+			continue
+		}
 		state, stateErr := controller.kubernetes.SiteState(ctx, site)
 		if stateErr != nil {
 			return stateErr
 		}
 		kubernetesStates[site] = state
-		minReplicas, maxReplicas := controller.siteReplicaBounds(site)
 		sites = append(sites, SiteResources{
 			Site: site, CurrentReplicas: state.CurrentReplicas,
 			MinReplicas: minReplicas, MaxReplicas: maxReplicas,

apps/api/internal/config/config.go

@@ -198,11 +198,11 @@ func Load() Config {
 		) != "",
 		WorkerAutoscalingEnabled:          env("AI_GATEWAY_WORKER_AUTOSCALING_ENABLED", "false") == "true",
 		WorkerReplicasNingbo:              envOptionalIntValidated("AI_GATEWAY_WORKER_REPLICAS_NINGBO", 1),
-		WorkerReplicasHongkong:            envOptionalIntValidated("AI_GATEWAY_WORKER_REPLICAS_HONGKONG", 1),
+		WorkerReplicasHongkong:            envOptionalIntValidated("AI_GATEWAY_WORKER_REPLICAS_HONGKONG", 0),
 		WorkerMinReplicasNingbo:           envOptionalIntValidated("AI_GATEWAY_WORKER_MIN_REPLICAS_NINGBO", 1),
-		WorkerMinReplicasHongkong:         envOptionalIntValidated("AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG", 1),
+		WorkerMinReplicasHongkong:         envOptionalIntValidated("AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG", 0),
 		WorkerMaxReplicasNingbo:           envOptionalIntValidated("AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO", 1),
-		WorkerMaxReplicasHongkong:         envOptionalIntValidated("AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG", 1),
+		WorkerMaxReplicasHongkong:         envOptionalIntValidated("AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG", 0),
 		WorkerTargetOutstandingPerReplica: envOptionalIntValidated("AI_GATEWAY_WORKER_TARGET_OUTSTANDING_PER_REPLICA", 0),
 		WorkerScaleUpWindowSeconds:        envIntValidated("AI_GATEWAY_WORKER_SCALE_UP_WINDOW_SECONDS", 20),
 		WorkerScaleDownStabilizationSeconds: envIntValidated(

apps/api/internal/config/config_test.go

@@ -217,6 +217,26 @@ func TestWorkerAutoscalingConfiguration(t *testing.T) {
 	}
 }
 
+func TestWorkerTopologyDefaultsToNingboSingleNode(t *testing.T) {
+	for _, name := range []string{
+		"AI_GATEWAY_WORKER_REPLICAS_NINGBO",
+		"AI_GATEWAY_WORKER_REPLICAS_HONGKONG",
+		"AI_GATEWAY_WORKER_MIN_REPLICAS_NINGBO",
+		"AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG",
+		"AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO",
+		"AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG",
+	} {
+		t.Setenv(name, "")
+	}
+	cfg := Load()
+	if cfg.WorkerReplicasNingbo != 1 || cfg.WorkerMinReplicasNingbo != 1 || cfg.WorkerMaxReplicasNingbo != 1 {
+		t.Fatalf("Ningbo Worker defaults=%d/%d/%d, want 1/1/1", cfg.WorkerReplicasNingbo, cfg.WorkerMinReplicasNingbo, cfg.WorkerMaxReplicasNingbo)
+	}
+	if cfg.WorkerReplicasHongkong != 0 || cfg.WorkerMinReplicasHongkong != 0 || cfg.WorkerMaxReplicasHongkong != 0 {
+		t.Fatalf("Hong Kong Worker defaults=%d/%d/%d, want disabled", cfg.WorkerReplicasHongkong, cfg.WorkerMinReplicasHongkong, cfg.WorkerMaxReplicasHongkong)
+	}
+}
+
 func TestLoadPrefersWorkerGlobalHardLimitAlias(t *testing.T) {
 	t.Setenv("AI_GATEWAY_ASYNC_WORKER_HARD_LIMIT", "48")
 	t.Setenv("AI_GATEWAY_ASYNC_WORKER_GLOBAL_HARD_LIMIT", "96")