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。

deploy/kubernetes/easyai-ai-gateway-cluster-release

@@ -16,6 +16,7 @@ source "$config_file"
 : "${K3S_BIN:=/usr/local/bin/k3s}"
 : "${DESIRED_STATE_DIR:=/usr/local/share/easyai-ai-gateway-release/production}"
 : "${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:=$AI_GATEWAY_ASYNC_WORKER_HARD_LIMIT}"
@@ -34,6 +35,8 @@ source "$config_file"
 : "${AI_GATEWAY_WORKER_AUTOSCALING_ENABLED:=false}"
 : "${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:=$((AI_GATEWAY_ASYNC_WORKER_INSTANCE_HARD_LIMIT * 2))}"
 : "${AI_GATEWAY_WORKER_SCALE_UP_WINDOW_SECONDS:=20}"
 : "${AI_GATEWAY_WORKER_SCALE_DOWN_STABILIZATION_SECONDS:=600}"
@@ -56,7 +59,10 @@ source "$config_file"
 for replica_value in \
   "$AI_GATEWAY_WORKER_REPLICAS_NINGBO" \
   "$AI_GATEWAY_WORKER_MIN_REPLICAS_NINGBO" \
-  "$AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO"; do
+  "$AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO" \
+  "$AI_GATEWAY_WORKER_REPLICAS_HONGKONG" \
+  "$AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG" \
+  "$AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG"; do
   [[ $replica_value =~ ^[0-9]+$ ]] || {
     echo 'Worker replica configuration must contain non-negative integers' >&2
     exit 1
@@ -127,13 +133,16 @@ done
    AI_GATEWAY_WORKER_MIN_REPLICAS_NINGBO <= AI_GATEWAY_WORKER_REPLICAS_NINGBO &&
    AI_GATEWAY_WORKER_REPLICAS_NINGBO <= AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO &&
    AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO <= 16 &&
+   AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG <= AI_GATEWAY_WORKER_REPLICAS_HONGKONG &&
+   AI_GATEWAY_WORKER_REPLICAS_HONGKONG <= AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG &&
+   AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG <= 16 &&
    AI_GATEWAY_NODE_MEMORY_TARGET_PERCENT < AI_GATEWAY_NODE_MEMORY_HARD_PERCENT &&
    AI_GATEWAY_NODE_MEMORY_HARD_PERCENT <= 95 &&
    AI_GATEWAY_NODE_CPU_TARGET_PERCENT <= 90 &&
    AI_GATEWAY_POSTGRES_CONNECTION_BUDGET <= 150 &&
    AI_GATEWAY_POSTGRES_NON_WORKER_CONNECTION_BUDGET < AI_GATEWAY_POSTGRES_CONNECTION_BUDGET &&
    AI_GATEWAY_POSTGRES_NON_WORKER_CONNECTION_BUDGET +
-     AI_GATEWAY_WORKER_REPLICAS_NINGBO *
+     (AI_GATEWAY_WORKER_REPLICAS_NINGBO + AI_GATEWAY_WORKER_REPLICAS_HONGKONG) *
        AI_GATEWAY_DATABASE_MAX_CONNS <= AI_GATEWAY_POSTGRES_CONNECTION_BUDGET )) || {
   echo 'worker capacity configuration exceeds the release safety bounds' >&2
   exit 1
@@ -159,6 +168,7 @@ manifest_get() {
 capacity_config_hash() {
   printf '%s\n' \
     "$AI_GATEWAY_WORKER_REPLICAS_NINGBO" \
+    "$AI_GATEWAY_WORKER_REPLICAS_HONGKONG" \
     "$AI_GATEWAY_ASYNC_WORKER_INSTANCE_HARD_LIMIT" \
     "$AI_GATEWAY_ASYNC_WORKER_HARD_LIMIT" \
     "$AI_GATEWAY_ASYNC_WORKER_GLOBAL_HARD_LIMIT" \
@@ -177,6 +187,8 @@ capacity_config_hash() {
     "$AI_GATEWAY_WORKER_AUTOSCALING_ENABLED" \
     "$AI_GATEWAY_WORKER_MIN_REPLICAS_NINGBO" \
     "$AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO" \
+    "$AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG" \
+    "$AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG" \
     "$AI_GATEWAY_WORKER_TARGET_OUTSTANDING_PER_REPLICA" \
     "$AI_GATEWAY_WORKER_SCALE_UP_WINDOW_SECONDS" \
     "$AI_GATEWAY_WORKER_SCALE_DOWN_STABILIZATION_SECONDS" \
@@ -196,6 +208,9 @@ record_capacity_config() {
 		--arg replicasNingbo "$AI_GATEWAY_WORKER_REPLICAS_NINGBO" \
 		--arg minNingbo "$AI_GATEWAY_WORKER_MIN_REPLICAS_NINGBO" \
 		--arg maxNingbo "$AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO" \
+		--arg replicasHongkong "$AI_GATEWAY_WORKER_REPLICAS_HONGKONG" \
+		--arg minHongkong "$AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG" \
+		--arg maxHongkong "$AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG" \
 		--arg autoscaling "$AI_GATEWAY_WORKER_AUTOSCALING_ENABLED" \
 		--arg instanceLimit "$AI_GATEWAY_ASYNC_WORKER_INSTANCE_HARD_LIMIT" \
 		--arg globalLimit "$AI_GATEWAY_ASYNC_WORKER_GLOBAL_HARD_LIMIT" \
@@ -213,11 +228,11 @@ record_capacity_config() {
 		--arg postgresBudget "$AI_GATEWAY_POSTGRES_CONNECTION_BUDGET" \
 		'{data:{
 			AI_GATEWAY_WORKER_REPLICAS_NINGBO:$replicasNingbo,
-			AI_GATEWAY_WORKER_REPLICAS_HONGKONG:null,
+			AI_GATEWAY_WORKER_REPLICAS_HONGKONG:$replicasHongkong,
 			AI_GATEWAY_WORKER_MIN_REPLICAS_NINGBO:$minNingbo,
-			AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG:null,
+			AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG:$minHongkong,
 			AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO:$maxNingbo,
-			AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG:null,
+			AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG:$maxHongkong,
 			AI_GATEWAY_WORKER_AUTOSCALING_ENABLED:$autoscaling,
 			AI_GATEWAY_ASYNC_WORKER_INSTANCE_HARD_LIMIT:$instanceLimit,
 			AI_GATEWAY_ASYNC_WORKER_HARD_LIMIT:$globalLimit,
@@ -245,6 +260,7 @@ record_capacity_config() {
   for deployment in \
     easyai-api-ningbo \
     easyai-worker-ningbo \
+    easyai-worker-hongkong \
     easyai-capacity-controller; do
     "${kubectl[@]}" annotate deployment "$deployment" -n "$NAMESPACE" \
       "easyai.io/config-hash=$config_hash" --overwrite >/dev/null
@@ -295,9 +311,9 @@ verify_site() {
   wait_for_url "$site Web" "http://$address:$web_port/" 'EasyAI AI Gateway'
 }
 
-retire_hongkong_site() {
+retire_hongkong_edges() {
   "${kubectl[@]}" delete deployment \
-    easyai-api-hongkong easyai-worker-hongkong easyai-web-hongkong \
+    easyai-api-hongkong easyai-web-hongkong \
     -n "$NAMESPACE" --ignore-not-found=true --wait=true >/dev/null
   "${kubectl[@]}" delete service \
     api-hongkong-edge web-hongkong-edge \
@@ -383,6 +399,7 @@ rollout_worker_site() {
   local replicas ready_replicas
   case $site in
     ningbo) replicas=$AI_GATEWAY_WORKER_REPLICAS_NINGBO ;;
+    hongkong) replicas=$AI_GATEWAY_WORKER_REPLICAS_HONGKONG ;;
     *) return 1 ;;
   esac
   "${kubectl[@]}" set env "deployment/easyai-worker-$site" -n "$NAMESPACE" \
@@ -403,9 +420,9 @@ rollout_worker_site() {
     "AI_GATEWAY_WORKER_REPLICAS_NINGBO=$AI_GATEWAY_WORKER_REPLICAS_NINGBO" \
     "AI_GATEWAY_WORKER_MIN_REPLICAS_NINGBO=$AI_GATEWAY_WORKER_MIN_REPLICAS_NINGBO" \
     "AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO=$AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO" \
-    'AI_GATEWAY_WORKER_REPLICAS_HONGKONG-' \
-    'AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG-' \
-    'AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG-' \
+    "AI_GATEWAY_WORKER_REPLICAS_HONGKONG=$AI_GATEWAY_WORKER_REPLICAS_HONGKONG" \
+    "AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG=$AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG" \
+    "AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG=$AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG" \
     "AI_GATEWAY_WORKER_TARGET_OUTSTANDING_PER_REPLICA=$AI_GATEWAY_WORKER_TARGET_OUTSTANDING_PER_REPLICA" || return 1
   "${kubectl[@]}" set resources "deployment/easyai-worker-$site" -n "$NAMESPACE" \
     --containers=worker \
@@ -435,9 +452,9 @@ rollout_capacity_controller() {
     "AI_GATEWAY_WORKER_REPLICAS_NINGBO=$AI_GATEWAY_WORKER_REPLICAS_NINGBO" \
     "AI_GATEWAY_WORKER_MIN_REPLICAS_NINGBO=$AI_GATEWAY_WORKER_MIN_REPLICAS_NINGBO" \
     "AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO=$AI_GATEWAY_WORKER_MAX_REPLICAS_NINGBO" \
-    'AI_GATEWAY_WORKER_REPLICAS_HONGKONG-' \
-    'AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG-' \
-    'AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG-' \
+    "AI_GATEWAY_WORKER_REPLICAS_HONGKONG=$AI_GATEWAY_WORKER_REPLICAS_HONGKONG" \
+    "AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG=$AI_GATEWAY_WORKER_MIN_REPLICAS_HONGKONG" \
+    "AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG=$AI_GATEWAY_WORKER_MAX_REPLICAS_HONGKONG" \
     "AI_GATEWAY_WORKER_TARGET_OUTSTANDING_PER_REPLICA=$AI_GATEWAY_WORKER_TARGET_OUTSTANDING_PER_REPLICA" \
     "AI_GATEWAY_WORKER_SCALE_UP_WINDOW_SECONDS=$AI_GATEWAY_WORKER_SCALE_UP_WINDOW_SECONDS" \
     "AI_GATEWAY_WORKER_SCALE_DOWN_STABILIZATION_SECONDS=$AI_GATEWAY_WORKER_SCALE_DOWN_STABILIZATION_SECONDS" \
@@ -604,6 +621,7 @@ apply_capacity_config() {
     return 1
   }
   rollout_worker_site ningbo ""
+  rollout_worker_site hongkong ""
   rollout_api_capacity_site ningbo
   if [[ $capacity_controller_enabled == true ]]; then
     rollout_capacity_controller ""
@@ -613,7 +631,7 @@ apply_capacity_config() {
   verify_site ningbo
   wait_for_url 'public readiness' "$PUBLIC_BASE_URL/api/v1/readyz" '"ok":true'
   record_capacity_config
-  echo "production_capacity=PASS config_hash=$(capacity_config_hash) site=ningbo replicas=$AI_GATEWAY_WORKER_REPLICAS_NINGBO instance_limit=$AI_GATEWAY_ASYNC_WORKER_INSTANCE_HARD_LIMIT global_limit=$AI_GATEWAY_ASYNC_WORKER_GLOBAL_HARD_LIMIT admission_microbatch=$AI_GATEWAY_ASYNC_ADMISSION_MICROBATCH_SIZE worker_database_pool=$AI_GATEWAY_DATABASE_MAX_CONNS api_database_pool=$AI_GATEWAY_API_DATABASE_MAX_CONNS database_min_idle=$AI_GATEWAY_DATABASE_MIN_IDLE_CONNS database_max_idle_seconds=$AI_GATEWAY_DATABASE_MAX_CONN_IDLE_SECONDS media_concurrency=$AI_GATEWAY_MEDIA_MATERIALIZATION_CONCURRENCY worker_memory_request_mib=$AI_GATEWAY_WORKER_MEMORY_REQUEST_MIB worker_cpu_request_millicores=$AI_GATEWAY_WORKER_CPU_REQUEST_MILLICORES autoscaling=$AI_GATEWAY_WORKER_AUTOSCALING_ENABLED"
+  echo "production_capacity=PASS config_hash=$(capacity_config_hash) replicas_ningbo=$AI_GATEWAY_WORKER_REPLICAS_NINGBO replicas_hongkong=$AI_GATEWAY_WORKER_REPLICAS_HONGKONG instance_limit=$AI_GATEWAY_ASYNC_WORKER_INSTANCE_HARD_LIMIT global_limit=$AI_GATEWAY_ASYNC_WORKER_GLOBAL_HARD_LIMIT admission_microbatch=$AI_GATEWAY_ASYNC_ADMISSION_MICROBATCH_SIZE worker_database_pool=$AI_GATEWAY_DATABASE_MAX_CONNS api_database_pool=$AI_GATEWAY_API_DATABASE_MAX_CONNS database_min_idle=$AI_GATEWAY_DATABASE_MIN_IDLE_CONNS database_max_idle_seconds=$AI_GATEWAY_DATABASE_MAX_CONN_IDLE_SECONDS media_concurrency=$AI_GATEWAY_MEDIA_MATERIALIZATION_CONCURRENCY worker_memory_request_mib=$AI_GATEWAY_WORKER_MEMORY_REQUEST_MIB worker_cpu_request_millicores=$AI_GATEWAY_WORKER_CPU_REQUEST_MILLICORES autoscaling=$AI_GATEWAY_WORKER_AUTOSCALING_ENABLED"
 }
 
 rollout_site() {
@@ -924,6 +942,7 @@ activate_manifest() {
        { rollout_worker_site ningbo "$api_image" &&
          { [[ $action == rollback ]] ||
            rollout_capacity_controller "$api_image"; }; }; } &&
+     rollout_worker_site hongkong "$api_image" &&
      rollout_site ningbo "$api_image" "$web_image" "$api_changed" "$web_changed" &&
      wait_for_url 'public readiness' "$PUBLIC_BASE_URL/api/v1/readyz" '"ok":true'; then
     :
@@ -936,7 +955,7 @@ activate_manifest() {
 		return 1
 	fi
 
-	retire_hongkong_site
+	retire_hongkong_edges
 	record_capacity_config
 	record_current "$manifest" "$action" "$started_at"
   rm -f -- "$deployment_snapshot" "$current_file"