去除多余异常

frontend/src/App.tsx

@@ -1,4 +1,4 @@
-import React, { useState, useEffect } from 'react';
+import  { useState, useEffect } from 'react';
 import { AlertCircle, RefreshCw } from 'lucide-react';
 import { ApiKeyForm } from './components/ApiKeyForm';
 import { ApiKeyCard } from './components/ApiKeyCard';

frontend/src/components/ApiKeyCard.tsx

@@ -1,5 +1,5 @@
-import React, { useState } from 'react';
-import { CheckCircle2, XCircle, Loader2, Trash2, RefreshCw, Copy, Eye, EyeOff } from 'lucide-react';
+import  { useState } from 'react';
+import { CheckCircle2, XCircle,Trash2, RefreshCw, Copy, Eye, EyeOff } from 'lucide-react';
 import { apiKeyService } from '../services/api';
 import type { ApiKey } from '../types/api';
 

frontend/src/components/Stats.tsx

@@ -1,5 +1,4 @@
-import React from 'react';
-import { CheckCircle, XCircle, DollarSign, Zap } from 'lucide-react';
+import { CheckCircle, XCircle, Zap,JapaneseYen } from 'lucide-react';
 import type { ApiKey } from '../types/api';
 
 interface StatsProps {
@@ -36,8 +35,8 @@ export function Stats({ apiKeys }: StatsProps) {
     },
     {
       name: '总余额',
-      value: `$${totalBalance.toFixed(2)}`,
-      icon: DollarSign,
+      value: `¥${totalBalance.toFixed(2)}`,
+      icon: JapaneseYen,
       color: 'text-blue-600',
       bgColor: 'bg-blue-50',
     },