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。

deploy/kubernetes/production/application.yaml

@@ -158,7 +158,7 @@ metadata:
     app.kubernetes.io/component: capacity-controller
     app.kubernetes.io/part-of: easyai-ai-gateway
 spec:
-  replicas: 2
+  replicas: 1
   strategy:
     type: RollingUpdate
     rollingUpdate:
@@ -176,22 +176,9 @@ spec:
     spec:
       serviceAccountName: easyai-capacity-controller
       terminationGracePeriodSeconds: 30
-      affinity:
-        podAntiAffinity:
-          requiredDuringSchedulingIgnoredDuringExecution:
-            - topologyKey: easyai.io/site
-              labelSelector:
-                matchLabels:
-                  app.kubernetes.io/name: easyai-capacity-controller
       nodeSelector:
+        easyai.io/site: ningbo
         easyai.io/workload: "true"
-      topologySpreadConstraints:
-        - maxSkew: 1
-          topologyKey: easyai.io/site
-          whenUnsatisfiable: DoNotSchedule
-          labelSelector:
-            matchLabels:
-              app.kubernetes.io/name: easyai-capacity-controller
       securityContext:
         runAsNonRoot: true
         runAsUser: 10001
@@ -225,7 +212,7 @@ spec:
             - name: AI_GATEWAY_WORKER_DATABASE_MAX_CONNS
               value: "32"
             - name: AI_GATEWAY_POSTGRES_NON_WORKER_CONNECTION_BUDGET
-              value: "72"
+              value: "36"
             - name: POD_NAMESPACE
               valueFrom:
                 fieldRef:
@@ -438,7 +425,7 @@ metadata:
     app.kubernetes.io/component: worker
     app.kubernetes.io/part-of: easyai-ai-gateway
 spec:
-  replicas: 0
+  replicas: 1
   strategy:
     type: RollingUpdate
     rollingUpdate: