fix(首页): 使用真实登录用户昵称显示问候语

- 移除 mock 数据中的 currentUser 引用
- 使用 AuthProvider 获取真实登录用户信息
- 未登录时显示默认昵称"用户"

src/app/page.tsx

@@ -6,13 +6,15 @@ import { AppLayout } from '@/components/layout/AppLayout';
 import { Welcome } from '@/components/features/Welcome';
 import { ChatInput } from '@/components/features/ChatInput';
 import { QuickActions } from '@/components/features/QuickActions';
-import { currentUser, getGreeting } from '@/data/mock';
+import { getGreeting } from '@/data/mock';
+import { useAuth } from '@/providers/AuthProvider';
 import { useConversations } from '@/hooks/useConversations';
 import { useModels, useTools, useSettings } from '@/hooks/useSettings';
 import type { QuickAction } from '@/types';
 
 export default function HomePage() {
   const router = useRouter();
+  const { user } = useAuth();
   const { createConversation } = useConversations();
   const { models, loading: modelsLoading } = useModels();
   const { tools: availableTools, loading: toolsLoading } = useTools();
@@ -22,7 +24,8 @@ export default function HomePage() {
   const [enabledTools, setEnabledTools] = useState<string[]>([]);
   const [isSending, setIsSending] = useState(false);
 
-  const greeting = getGreeting(currentUser.name);
+  // 使用真实登录用户的昵称，如果未登录则显示"用户"
+  const greeting = getGreeting(user?.nickname || '用户');
 
   // 初始化默认设置
   useEffect(() => {