feat(deploy): 增加三节点 K3s 高可用迁移能力

新增 WireGuard 全互联、三 server embedded-etcd K3s、CloudNativePG 双实例、Barman OSS 备份、双 NGINX、Kubernetes Secret/RBAC 与本地旧文件按严格 24 小时清理。

新增维护窗口数据迁移、digest 固定滚动发布、应用回滚、跨节点文件 E2E、节点和数据库故障演练、CNPG 恢复与 etcd 快照验收脚本；洛杉矶仅作为带 NoSchedule 污点的仲裁节点。

所有生产 Secret 只在执行时从 0600 本地环境和旧生产容器导入，仓库不保存凭据；公网入口保持人工 DNS 故障切换边界。

验证：bash -n、ShellCheck、kubectl kustomize、Node 语法检查、Secret 扫描、OSS put/head/delete 实测。

deploy/kubernetes/production/application-config.yaml

@@ -0,0 +1,39 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: easyai-ai-gateway-config
+  labels:
+    app.kubernetes.io/part-of: easyai-ai-gateway
+data:
+  APP_ENV: production
+  HTTP_ADDR: ":8088"
+  IDENTITY_MODE: hybrid
+  IDENTITY_SECRET_STORE: kubernetes
+  IDENTITY_KUBERNETES_NAMESPACE: easyai
+  IDENTITY_KUBERNETES_SECRET_NAME: easyai-gateway-security-events
+  IDENTITY_SECURITY_EVENTS_HEARTBEAT_INTERVAL_SECONDS: "60"
+  IDENTITY_SECURITY_EVENTS_STALE_AFTER_SECONDS: "180"
+  IDENTITY_SECURITY_EVENTS_CLOCK_SKEW_SECONDS: "60"
+  SERVER_MAIN_BASE_URL: http://10.77.0.1:3000
+  TASK_PROGRESS_CALLBACK_ENABLED: "true"
+  TASK_PROGRESS_CALLBACK_URL: http://10.77.0.1:3000/internal/platform/task-progress-callbacks
+  TASK_PROGRESS_CALLBACK_TIMEOUT_MS: "5000"
+  TASK_PROGRESS_CALLBACK_MAX_ATTEMPTS: "10"
+  AI_GATEWAY_TASK_CLEANUP_ENABLED: "false"
+  AI_GATEWAY_TASK_RETENTION_DAYS: "30"
+  AI_GATEWAY_TASK_ANALYSIS_RETENTION_DAYS: "7"
+  AI_GATEWAY_TASK_CLEANUP_INTERVAL_SECONDS: "300"
+  AI_GATEWAY_TASK_CLEANUP_BATCH_SIZE: "1000"
+  CORS_ALLOWED_ORIGIN: https://ai.51easyai.com
+  AI_GATEWAY_PUBLIC_BASE_URL: https://ai.51easyai.com
+  AI_GATEWAY_WEB_BASE_URL: https://ai.51easyai.com
+  AI_GATEWAY_GENERATED_STORAGE_DIR: /app/data/static/generated
+  AI_GATEWAY_UPLOADED_STORAGE_DIR: /app/data/static/uploaded
+  AI_GATEWAY_LOCAL_TEMP_ASSET_TTL_HOURS: "24"
+  AI_GATEWAY_LOCAL_RESULT_TTL_HOURS: "24"
+  AI_GATEWAY_LOCAL_RESULT_MIN_FREE_BYTES: "10737418240"
+  AI_GATEWAY_LOCAL_RESULT_MAX_BYTES: "268435456"
+  AI_GATEWAY_LOCAL_RESULT_MAX_TASK_BYTES: "536870912"
+  AI_GATEWAY_ASYNC_QUEUE_WORKER_ENABLED: "true"
+  AI_GATEWAY_ASYNC_WORKER_HARD_LIMIT: "2048"
+  AI_GATEWAY_ASYNC_WORKER_REFRESH_INTERVAL_SECONDS: "5"