refactor(i18n): U43 深度残余硬编码中文 UI 文本清零 — 17 文件 ~40 处→0

趋势标签(上升/下降/平稳) + K8s 卡片标题(Pod级别/安全上下文/实例/详情) + data-table 默认值(搜索/暂无数据) + Deployment 编辑器标签(数据卷/挂载/只读写/manifest提示/镜像拉取凭证) + HostSettings 4 个命名空间描述 + 7 个 K8s 页面刷新按钮 + 资源编辑器新建/编辑 + Agent 执行命令描述 + 账单保存成功 toast + 容量预警标题

新增 common 30 语义化翻译键, zh/en 7898→7928 对齐
tsc -b=0, npm build✓ (16.55s), ESLint=0/43/any=0, go build=0, 17/17 测试通过

frontend/src/components/cloud/BillingRecordDialog.tsx

@@ -80,7 +80,7 @@ export function BillingRecordDialog({ open, onOpenChange, editingRecord, onSucce
       }
       onOpenChange(false);
       onSuccess();
-      toast('保存成功');
+      toast(i18n.t("common.saveSuccess"));
     } catch (e) {
       toast.error(i18n.t('kubernetes.msg.saveFailed'), { description: (e as JsonData).message });
     } finally {

frontend/src/components/cloud/BillingRuleDialog.tsx

@@ -71,7 +71,7 @@ export function BillingRuleDialog({ open, onOpenChange, editingRule, onSuccess }
       }
       onOpenChange(false);
       onSuccess();
-      toast('保存成功');
+      toast(i18n.t("common.saveSuccess"));
     } catch (e) {
       toast.error(i18n.t('kubernetes.msg.saveFailed'), { description: (e as JsonData).message });
     } finally {