fix(cluster): 强制关键副本跨节点分散

避免同站点 Worker 与容量控制器在滚动发布时集中到同一节点，并让 Kubernetes 运行态清单变更进入可追溯的 API release。\n\n验证：bash -n、ShellCheck、manual-release-test、生产集群 server-side dry-run。

deploy/kubernetes/production/application.yaml

@@ -174,6 +174,13 @@ 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/workload: "true"
       topologySpreadConstraints:
@@ -447,6 +454,14 @@ spec:
     spec:
       serviceAccountName: easyai-ai-gateway
       terminationGracePeriodSeconds: 90
+      affinity:
+        podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            - topologyKey: kubernetes.io/hostname
+              labelSelector:
+                matchLabels:
+                  app.kubernetes.io/name: easyai-worker
+                  easyai.io/site: ningbo
       topologySpreadConstraints:
         - maxSkew: 1
           topologyKey: kubernetes.io/hostname
@@ -612,6 +627,14 @@ spec:
     spec:
       serviceAccountName: easyai-ai-gateway
       terminationGracePeriodSeconds: 90
+      affinity:
+        podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            - topologyKey: kubernetes.io/hostname
+              labelSelector:
+                matchLabels:
+                  app.kubernetes.io/name: easyai-worker
+                  easyai.io/site: hongkong
       topologySpreadConstraints:
         - maxSkew: 1
           topologyKey: kubernetes.io/hostname