feat(i18n): cloud 模块全量国际化迁移 — 4 组件 + 90 新增翻译键

迁移组件:
- RegionManager.tsx — providerNames→getProviderNames(t) 函数模式, 全量 t() 替换
- CloudAccountManager.tsx — providerLabels→getProviderLabels(t), 卡片/弹框/表单全量迁移
- CloudBilling.tsx — 概览/记录/预警三 Tab 全量迁移, TrendChart/StatStrip 标签国际化
- DomainManager.tsx — 域名卡片/状态徽章/创建编辑弹框全量迁移

翻译键: cloud 命名空间 145→235 键 (+90), common 新增 deleteFailed/deleteSuccess
验证: tsc -b=0, npm build✅ (21.21s), 17/17 集成测试通过, 0 缺失键, 0 残留 UI 中文

frontend/src/locales/zh-CN.json

@@ -471,7 +471,9 @@
     "channel": "渠道",
     "contact": "联系人",
     "true": "是",
-    "false": "否"
+    "false": "否",
+    "deleteFailed": "删除失败",
+    "deleteSuccess": "删除成功"
   },
   "menu": {
     "dashboard": "仪表盘",
@@ -3822,7 +3824,95 @@
     "setBudget": "设置预算",
     "budgetAlert": "预算预警",
     "budgetUsage": "预算使用率",
-    "budgetRemaining": "剩余预算"
+    "budgetRemaining": "剩余预算",
+    "code": "编码",
+    "vendor": "云商",
+    "location": "位置",
+    "enabled": "启用",
+    "disabled": "禁用",
+    "allVendors": "全部云商",
+    "selectedRegionCount": "已选择 {{count}} 个区域",
+    "clearSelection": "取消选择",
+    "batchDelete": "批量删除",
+    "batchDeleteRegion": "批量删除区域",
+    "batchDeleteRegionConfirm": "确定删除选中的 {{count}} 个区域吗？此操作不可撤销。",
+    "batchDeletedRegions": "已删除 {{count}} 个区域",
+    "batchDeleteFailed": "批量删除失败",
+    "deleteRegionConfirm": "确定删除「{{name}}」吗？此操作不可撤销。",
+    "regionDeleted": "区域已删除",
+    "regionsSubtitle": "管理各云厂商的区域与接入端点",
+    "noRegionData": "暂无区域数据",
+    "searchRegion": "搜索区域名称或编码...",
+    "noMatchRegion": "暂无匹配区域",
+    "geoLocation": "地理位置",
+    "regionNamePlaceholder": "如：华北-北京",
+    "regionCodePlaceholder": "如：cn-north-1",
+    "locationPlaceholder": "如：中国北京",
+    "endpointPlaceholder": "如：ecs.cn-north-1.aliyuncs.com",
+    "normal": "正常",
+    "stopped": "已停用",
+    "error": "异常",
+    "searchAccount": "搜索账号名称或AccessKey...",
+    "accountsSubtitle": "管理多云平台的访问凭证和账号信息",
+    "noAccountData": "暂无云账号数据",
+    "monthlyFee": "月费用",
+    "serverCount": "服务器数",
+    "keepBlank": "留空保持不变",
+    "monthlyFeeUnit": "月费用 (元)",
+    "saveChanges": "保存修改",
+    "createAccount": "创建账号",
+    "editAccountDesc": "修改账号信息和访问凭证，留空则保持原凭证不变",
+    "addAccountDesc": "录入多云平台的访问凭证，用于资源同步与成本统计",
+    "accountNamePlaceholder": "阿里云生产账号",
+    "platformLabel": "云平台",
+    "allPlatforms": "全部平台",
+    "loadStatsFailed": "加载统计失败",
+    "loadBillingFailed": "加载账单失败",
+    "loadAlertRulesFailed": "加载预警规则失败",
+    "deleteBillingConfirm": "确定删除这条成本记录？",
+    "operationFailed": "操作失败",
+    "overviewStats": "概览统计",
+    "costRecords": "成本记录",
+    "startDate": "开始日期",
+    "endDate": "结束日期",
+    "query": "查询",
+    "billingSubtitle": "多云成本统计、记录与预警",
+    "today": "今日",
+    "thisMonth": "本月",
+    "yearly": "年度",
+    "alertCount": "{{count}} 条",
+    "recordCost": "记录成本",
+    "costAlert": "成本预警",
+    "monthlyAccumulated": "月累计",
+    "current": "当前",
+    "monthVendorDistribution": "本月厂商成本分布",
+    "noDistributionData": "暂无分布数据",
+    "noStatsData": "暂无统计数据",
+    "noCostRecords": "暂无成本记录",
+    "colDate": "日期",
+    "colService": "服务",
+    "colRegion": "区域",
+    "colAccount": "账号",
+    "colCost": "费用",
+    "colDescription": "说明",
+    "noAlertRules": "暂无预警规则",
+    "alertRuleHint": "添加规则后，成本超阈值将在此页管理",
+    "colMetric": "指标",
+    "lastTriggered": "最后触发",
+    "deleteBillingRecord": "删除账单记录",
+    "deleteAlertRule": "删除预警规则",
+    "deleteAlertRuleConfirm": "确定删除此预警规则？",
+    "pending": "待审核",
+    "searchDomain": "搜索域名...",
+    "allStatus": "全部状态",
+    "domainsSubtitle": "管理域名注册信息和DNS解析记录",
+    "noDomainData": "暂无域名数据",
+    "recordCountLabel": "解析记录数",
+    "enableSsl": "启用 SSL",
+    "createDomain": "创建域名",
+    "editDomainDesc": "修改域名注册信息、DNS 配置和 SSL 证书状态",
+    "addDomainDesc": "录入域名信息，包括注册商、DNS 服务商和到期时间",
+    "daysLeft": "{{count}}天"
   },
   "agent": {
     "title": "Agent 管理",