refactor(i18n): U27 多模块 phantom key 批量清理 — Cloud/Deploy/Agent/Monitor/System 5 模块 25 文件, 180 个 phantom key → 51 残留, 129 个替换为语义化键, 新增 12 子命名空间, zh/en 7185→7294 +109 键对齐, tsc -b=0, npm build✓ (16.31s), ESLint=0/0/0, go build=0, 17/17 测试通过

frontend/src/components/monitor/datasource/PrometheusDatasourceManager.tsx

@@ -34,7 +34,7 @@ export default function PrometheusDatasourceManager() {
   const [editingDs, setEditingDs] = useState<PromDS | null>(null);
 
   useEffect(() => {
-    if (isError) toast.error(i18n.t('获取数据源列表失败'));
+    if (isError) toast.error(i18n.t('monitor.promDs2.listFailed'));
   }, [isError]);
 
   const openCreate = () => {
@@ -67,7 +67,7 @@ export default function PrometheusDatasourceManager() {
       await setDefaultMutation.mutateAsync(ds.id);
       toast.success(`已将「${ds.name}」设为默认数据源`);
     } catch {
-      toast.error(i18n.t('删除失败'));
+      toast.error(i18n.t('monitor.promDs2.deleteFailed'));
     }
   };
 
@@ -95,8 +95,8 @@ export default function PrometheusDatasourceManager() {
         {sources.length === 0 ? (
           <PageEmpty
             icon={<Database className="h-12 w-12" />}
-            title={i18n.t('暂无 Prometheus 数据源')}
-            description={i18n.t('添加数据源后可用于指标监控与监控大屏')}
+            title={i18n.t('monitor.promDs2.noData')}
+            description={i18n.t('monitor.promDs2.addHint')}
             action={(
               <Button onClick={openCreate} size="sm" className="dg-btn-primary">
                 <Plus className="w-4 h-4 mr-1" />添加数据源