feat(i18n): add internationalization support with i18next

- Add i18next and related dependencies for internationalization
- Implement language switcher component with English and Chinese support
- Create translation files for English and Chinese locales
- Update login and home pages to use translations
- Configure i18n initialization with language detection
- Add dayjs locale synchronization with i18n language changes
- Update tsconfig and eslint to ignore new locales directory
- Remove unused App.css and simplify index.css
- Update npmrc with mirror configuration

src/pages/Home.tsx

@@ -14,6 +14,8 @@ import {
   Typography, 
   styled 
 } from '@mui/material';
+import { useTranslation } from 'react-i18next';
+import LanguageSwitcher from '../components/LanguageSwitcher';
 
 const StyledCard = styled(Card)({
   height: '100%',
@@ -93,8 +95,18 @@ const recentQueries = [
 ];
 
 const Home = () => {
+  const { t } = useTranslation();
+  
   return (
-    <Box>
+    <Box className="p-6">
+      {/* Header with Language Switcher */}
+      <Box className="flex justify-between items-center mb-6">
+        <Typography variant="h4" className="font-bold text-gray-800">
+          {t('navigation.dashboard')}
+        </Typography>
+        <LanguageSwitcher />
+      </Box>
+      
       <Grid container spacing={3}>
         {/* Knowledge Base Status Card */}
         <Grid size={{ xs: 12, md: 6, lg: 4 }}>

src/pages/Login.tsx

@@ -1,5 +1,6 @@
 import { useState } from 'react';
 import { useNavigate } from 'react-router-dom';
+import { useTranslation } from 'react-i18next';
 import { 
   Box, 
   Button, 
@@ -14,8 +15,10 @@ import {
   Card,
   CardContent
 } from '@mui/material';
+import LanguageSwitcher from '../components/LanguageSwitcher';
 
 const Login = () => {
+  const { t } = useTranslation();
   const [email, setEmail] = useState('');
   const [password, setPassword] = useState('');
   const [rememberEmail, setRememberEmail] = useState(false);
@@ -24,6 +27,8 @@ const Login = () => {
   const [passwordError, setPasswordError] = useState(false);
   const navigate = useNavigate();
 
+  console.log(t, t('en'), t('login'));
+
   const handleSubmit = (e: React.FormEvent) => {
     e.preventDefault();
 
@@ -44,7 +49,7 @@ const Login = () => {
     <Box sx={{ minHeight: '100vh', width: '100vw', bgcolor: 'background.default', display: 'flex', flexDirection: 'column' }}>
       {/* 顶部栏使用主题主色 */}
       <AppBar position="static" color="primary" enableColorOnDark>
-        <Toolbar sx={{ minHeight: 60 }}>
+        <Toolbar sx={{ minHeight: 60, justifyContent: 'space-between' }}>
           <Box
             sx={{
               width: 40,
@@ -62,6 +67,7 @@ const Login = () => {
           >
             T
           </Box>
+          <LanguageSwitcher />
         </Toolbar>
       </AppBar>
 
@@ -69,12 +75,12 @@ const Login = () => {
       <Container maxWidth="sm" sx={{ flex: 1, display: 'flex', alignItems: 'center' }}>
         <Card sx={{ width: '100%' }}>
           <CardContent sx={{ p: 4 }}>
-            <Typography variant="caption" color="text.secondary" sx={{ mb: 1, display: 'block' }}>
-              Servicename
+            <Typography variant="subtitle1" color="text.secondary" sx={{ mb: 1, display: 'block' }}>
+              T-Systems Enterprise RAG Empowerment System
             </Typography>
             <Typography variant="h5" fontWeight={700} sx={{ mb: 2 }}>
-              Enter Login
-              <br /> Email & Password
+              {t('login.login')}
+              <br /> {t('login.emailLabel')} & {t('login.passwordLabel')}
             </Typography>
 
             <Box component="form" onSubmit={handleSubmit} noValidate>
@@ -83,7 +89,7 @@ const Login = () => {
                 id="email"
                 name="email"
                 type="email"
-                placeholder="Email"
+                placeholder={t('login.emailPlaceholder')}
                 autoComplete="email"
                 value={email}
                 onChange={(e) => setEmail(e.target.value)}
@@ -97,7 +103,7 @@ const Login = () => {
                 id="password"
                 name="password"
                 type="password"
-                placeholder="Password"
+                placeholder={t('login.passwordPlaceholder')}
                 autoComplete="current-password"
                 value={password}
                 onChange={(e) => setPassword(e.target.value)}
@@ -115,23 +121,18 @@ const Login = () => {
                       id="rememberEmail"
                     />
                   }
-                  label="Remember email"
+                  label={t('login.rememberMe')}
                 />
-                <Link href="#" variant="caption">
-                  Forgot your username or password?
-                </Link>
               </Box>
 
               <Button type="submit" variant="contained" fullWidth disabled={isSubmitting}>
-                {isSubmitting ? 'Processing...' : 'Login'}
+                {isSubmitting ? 'Processing...' : t('login.login')}
               </Button>
             </Box>
 
             <Box sx={{ mt: 2, textAlign: 'center' }}>
-              <Link href="#">Do you need help?</Link>
               <Box mt={0.5}>
-                {/* 保留说明文案，去掉社交登录 */}
-                No account? <Link href="#">Sign up</Link>.
+                {t('login.signInTip')} <Link href="#">{t('login.signUp')}</Link>.
               </Box>
             </Box>
           </CardContent>