feat: add i18n keys for AI Models card and fix missing .status.error CSS

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

frontend/src/locales/en.ts

@@ -131,6 +131,17 @@ export interface Translations {
     footerDegraded: string;
     footerChecking: string;
     totalChunks: string;
+    cardModels: string;
+    testConnectionBtn: string;
+    testingBtn: string;
+    roleMainLlm: string;
+    roleHydeLlm: string;
+    roleEmbedding: string;
+    roleReranker: string;
+    modelStatusNeverCalled: string;
+    modelStatusDisabled: string;
+    sharesUsageWithMain: string;
+    lastCalledNever: string;
   };
   docs: {
     topbarTitle: string;
@@ -361,6 +372,17 @@ export const en: Translations = {
     footerDegraded: 'Degraded',
     footerChecking: 'Checking…',
     totalChunks: 'Total vector chunks',
+    cardModels: 'AI Models',
+    testConnectionBtn: 'Test connection',
+    testingBtn: 'Testing…',
+    roleMainLlm: 'Main answer LLM',
+    roleHydeLlm: 'HyDE query expansion',
+    roleEmbedding: 'Embedding',
+    roleReranker: 'Reranker',
+    modelStatusNeverCalled: 'Not called yet',
+    modelStatusDisabled: 'Disabled',
+    sharesUsageWithMain: 'Shares usage with main LLM',
+    lastCalledNever: 'Never',
   },
   docs: {
     topbarTitle: 'Document Management',

frontend/src/locales/zh.ts

@@ -132,6 +132,17 @@ export const zh: Translations = {
     footerDegraded: '降级运行',
     footerChecking: '检查中…',
     totalChunks: '向量分块总数',
+    cardModels: 'AI 模型',
+    testConnectionBtn: '测试连接',
+    testingBtn: '测试中…',
+    roleMainLlm: '主问答 LLM',
+    roleHydeLlm: 'HyDE 查询增强',
+    roleEmbedding: 'Embedding',
+    roleReranker: 'Reranker',
+    modelStatusNeverCalled: '尚未调用',
+    modelStatusDisabled: '已禁用',
+    sharesUsageWithMain: '与主 LLM 共用统计',
+    lastCalledNever: '从未',
   },
   docs: {
     topbarTitle: '文档管理',

frontend/src/styles/globals.css

@@ -136,6 +136,8 @@ body {
 .status.warn::before { background: var(--warn); }
 .status.risk { color: var(--danger); background: var(--danger-bg); }
 .status.risk::before { background: var(--danger); }
+.status.error { color: var(--danger); background: var(--danger-bg); }
+.status.error::before { background: var(--danger); }
 .status.info { color: var(--info); background: var(--info-bg); }
 .status.info::before { background: var(--info); }