feat: 实现AppHeader和LoginView完整国际化支持

- 完成AppHeader.vue全面国际化
  * 版本检查和更新通知系统多语言支持
  * 用户菜单和账户信息修改模态框国际化
  * 退出登录确认流程多语言化
  * 总计替换30+个硬编码中文字符串

- 实现LoginView.vue完整国际化
  * 登录表单所有文本支持多语言
  * 添加语言切换组件到登录页面
  * 确保用户可在登录前选择语言

- 扩展三语言翻译文件
  * zh-cn.js: 简体中文标准翻译
  * zh-tw.js: 繁体中文专业化翻译
  * en.js: 英文技术术语标准翻译
  * 新增header和login完整翻译组

- 提升用户体验
  * 登录页面右上角工具栏（语言+主题切换）
  * 响应式布局适配多设备
  * 完整的首次访问多语言体验

web/admin-spa/src/components/layout/AppHeader.vue

@@ -11,7 +11,7 @@
         <LogoTitle
           :loading="oemLoading"
           :logo-src="oemSettings.siteIconData || oemSettings.siteIcon"
-          subtitle="管理后台"
+          :subtitle="t('header.adminPanel')"
           :title="oemSettings.siteName"
           title-class="text-white dark:text-gray-100"
         >
@@ -27,10 +27,10 @@
                 class="inline-flex animate-pulse items-center gap-1 rounded-full border border-green-600 bg-green-500 px-2 py-0.5 text-xs text-white transition-colors hover:bg-green-600"
                 :href="versionInfo.releaseInfo?.htmlUrl || '#'"
                 target="_blank"
-                title="有新版本可用"
+                :title="t('header.newVersionAvailable')"
               >
                 <i class="fas fa-arrow-up text-[10px]" />
-                <span>新版本</span>
+                <span>{{ t('header.newVersion') }}</span>
               </a>
             </div>
           </template>
@@ -77,7 +77,7 @@
             <!-- 版本信息 -->
             <div class="border-b border-gray-100 px-4 py-3 dark:border-gray-700">
               <div class="flex items-center justify-between text-sm">
-                <span class="text-gray-500 dark:text-gray-400">当前版本</span>
+                <span class="text-gray-500 dark:text-gray-400">{{ t('header.currentVersion') }}</span>
                 <span class="font-mono text-gray-700 dark:text-gray-300"
                   >v{{ versionInfo.current || '...' }}</span
                 >
@@ -85,7 +85,7 @@
               <div v-if="versionInfo.hasUpdate" class="mt-2">
                 <div class="mb-2 flex items-center justify-between text-sm">
                   <span class="font-medium text-green-600 dark:text-green-400">
-                    <i class="fas fa-arrow-up mr-1" />有新版本
+                    <i class="fas fa-arrow-up mr-1" />{{ t('header.hasUpdate') }}
                   </span>
                   <span class="font-mono text-green-600 dark:text-green-400"
                     >v{{ versionInfo.latest }}</span
@@ -96,14 +96,14 @@
                   :href="versionInfo.releaseInfo?.htmlUrl || '#'"
                   target="_blank"
                 >
-                  <i class="fas fa-external-link-alt mr-1" />查看更新
+                  <i class="fas fa-external-link-alt mr-1" />{{ t('header.viewUpdate') }}
                 </a>
               </div>
               <div
                 v-else-if="versionInfo.checkingUpdate"
                 class="mt-2 text-center text-xs text-gray-500 dark:text-gray-400"
               >
-                <i class="fas fa-spinner fa-spin mr-1" />检查更新中...
+                <i class="fas fa-spinner fa-spin mr-1" />{{ t('header.checkingUpdate') }}
               </div>
               <div v-else class="mt-2 text-center">
                 <!-- 已是最新版提醒 -->
@@ -114,7 +114,7 @@
                     class="inline-block rounded-lg border border-green-200 bg-green-100 px-3 py-1.5 dark:border-green-800 dark:bg-green-900/30"
                   >
                     <p class="text-xs font-medium text-green-700 dark:text-green-400">
-                      <i class="fas fa-check-circle mr-1" />当前已是最新版本
+                      <i class="fas fa-check-circle mr-1" />{{ t('header.alreadyLatest') }}
                     </p>
                   </div>
                   <button
@@ -123,7 +123,7 @@
                     class="text-xs text-blue-500 transition-colors hover:text-blue-700 dark:text-blue-400 dark:hover:text-blue-300"
                     @click="checkForUpdates()"
                   >
-                    <i class="fas fa-sync-alt mr-1" />检查更新
+                    <i class="fas fa-sync-alt mr-1" />{{ t('header.checkUpdate') }}
                   </button>
                 </transition>
               </div>
@@ -134,7 +134,7 @@
               @click="openChangePasswordModal"
             >
               <i class="fas fa-key text-blue-500" />
-              <span>修改账户信息</span>
+              <span>{{ t('header.changeAccountInfo') }}</span>
             </button>
 
             <hr class="my-2 border-gray-200 dark:border-gray-700" />
@@ -144,7 +144,7 @@
               @click="logout"
             >
               <i class="fas fa-sign-out-alt text-red-500" />
-              <span>退出登录</span>
+              <span>{{ t('header.logout') }}</span>
             </button>
           </div>
         </div>
@@ -165,7 +165,7 @@
           >
             <i class="fas fa-key text-white" />
           </div>
-          <h3 class="text-xl font-bold text-gray-900 dark:text-gray-100">修改账户信息</h3>
+          <h3 class="text-xl font-bold text-gray-900 dark:text-gray-100">{{ t('header.changePasswordModal.title') }}</h3>
         </div>
         <button
           class="text-gray-400 transition-colors hover:text-gray-600 dark:hover:text-gray-300"
@@ -181,7 +181,7 @@
       >
         <div>
           <label class="mb-3 block text-sm font-semibold text-gray-700 dark:text-gray-300"
-            >当前用户名</label
+            >{{ t('header.changePasswordModal.currentUsername') }}</label
           >
           <input
             class="form-input w-full cursor-not-allowed bg-gray-100 dark:bg-gray-700 dark:text-gray-300"
@@ -190,31 +190,31 @@
             :value="currentUser.username || 'Admin'"
           />
           <p class="mt-2 text-xs text-gray-500 dark:text-gray-400">
-            当前用户名，输入新用户名以修改
+            {{ t('header.changePasswordModal.currentUsernameHint') }}
           </p>
         </div>
 
         <div>
           <label class="mb-3 block text-sm font-semibold text-gray-700 dark:text-gray-300"
-            >新用户名</label
+            >{{ t('header.changePasswordModal.newUsername') }}</label
           >
           <input
             v-model="changePasswordForm.newUsername"
             class="form-input w-full"
-            placeholder="输入新用户名（留空保持不变）"
+            :placeholder="t('header.changePasswordModal.newUsernamePlaceholder')"
             type="text"
           />
-          <p class="mt-2 text-xs text-gray-500 dark:text-gray-400">留空表示不修改用户名</p>
+          <p class="mt-2 text-xs text-gray-500 dark:text-gray-400">{{ t('header.changePasswordModal.newUsernameHint') }}</p>
         </div>
 
         <div>
           <label class="mb-3 block text-sm font-semibold text-gray-700 dark:text-gray-300"
-            >当前密码</label
+            >{{ t('header.changePasswordModal.currentPassword') }}</label
           >
           <input
             v-model="changePasswordForm.currentPassword"
             class="form-input w-full"
-            placeholder="请输入当前密码"
+            :placeholder="t('header.changePasswordModal.currentPasswordPlaceholder')"
             required
             type="password"
           />
@@ -222,26 +222,26 @@
 
         <div>
           <label class="mb-3 block text-sm font-semibold text-gray-700 dark:text-gray-300"
-            >新密码</label
+            >{{ t('header.changePasswordModal.newPassword') }}</label
           >
           <input
             v-model="changePasswordForm.newPassword"
             class="form-input w-full"
-            placeholder="请输入新密码"
+            :placeholder="t('header.changePasswordModal.newPasswordPlaceholder')"
             required
             type="password"
           />
-          <p class="mt-2 text-xs text-gray-500 dark:text-gray-400">密码长度至少8位</p>
+          <p class="mt-2 text-xs text-gray-500 dark:text-gray-400">{{ t('header.changePasswordModal.newPasswordHint') }}</p>
         </div>
 
         <div>
           <label class="mb-3 block text-sm font-semibold text-gray-700 dark:text-gray-300"
-            >确认新密码</label
+            >{{ t('header.changePasswordModal.confirmPassword') }}</label
           >
           <input
             v-model="changePasswordForm.confirmPassword"
             class="form-input w-full"
-            placeholder="请再次输入新密码"
+            :placeholder="t('header.changePasswordModal.confirmPasswordPlaceholder')"
             required
             type="password"
           />
@@ -253,7 +253,7 @@
             type="button"
             @click="closeChangePasswordModal"
           >
-            取消
+            {{ t('common.cancel') }}
           </button>
           <button
             class="btn btn-primary flex-1 px-6 py-3 font-semibold"
@@ -262,7 +262,7 @@
           >
             <div v-if="changePasswordLoading" class="loading-spinner mr-2" />
             <i v-else class="fas fa-save mr-2" />
-            {{ changePasswordLoading ? '保存中...' : '保存修改' }}
+            {{ changePasswordLoading ? t('header.changePasswordModal.saving') : t('header.changePasswordModal.save') }}
           </button>
         </div>
       </form>
@@ -273,6 +273,7 @@
 <script setup>
 import { ref, reactive, computed, onMounted, onUnmounted } from 'vue'
 import { useRouter } from 'vue-router'
+import { useI18n } from 'vue-i18n'
 import { useAuthStore } from '@/stores/auth'
 import { showToast } from '@/utils/toast'
 import { apiClient } from '@/config/api'
@@ -282,6 +283,7 @@ import LanguageSwitch from '@/components/common/LanguageSwitch.vue'
 
 const router = useRouter()
 const authStore = useAuthStore()
+const { t } = useI18n()
 
 // 当前用户信息
 const currentUser = computed(() => authStore.user || { username: 'Admin' })
@@ -391,12 +393,12 @@ const closeChangePasswordModal = () => {
 // 修改密码
 const changePassword = async () => {
   if (changePasswordForm.newPassword !== changePasswordForm.confirmPassword) {
-    showToast('两次输入的密码不一致', 'error')
+    showToast(t('header.changePasswordModal.passwordMismatch'), 'error')
     return
   }
 
   if (changePasswordForm.newPassword.length < 8) {
-    showToast('新密码长度至少8位', 'error')
+    showToast(t('header.changePasswordModal.passwordTooShort'), 'error')
     return
   }
 
@@ -411,8 +413,8 @@ const changePassword = async () => {
 
     if (data.success) {
       const message = changePasswordForm.newUsername
-        ? '账户信息修改成功，请重新登录'
-        : '密码修改成功，请重新登录'
+        ? t('header.changePasswordModal.accountInfoChangeSuccess')
+        : t('header.changePasswordModal.passwordChangeSuccess')
       showToast(message, 'success')
       closeChangePasswordModal()
 
@@ -422,10 +424,10 @@ const changePassword = async () => {
         router.push('/login')
       }, 1500)
     } else {
-      showToast(data.message || '修改失败', 'error')
+      showToast(data.message || t('header.changePasswordModal.changeFailed'), 'error')
     }
   } catch (error) {
-    showToast('修改密码失败', 'error')
+    showToast(t('header.changePasswordModal.changePasswordFailed'), 'error')
   } finally {
     changePasswordLoading.value = false
   }
@@ -433,10 +435,10 @@ const changePassword = async () => {
 
 // 退出登录
 const logout = () => {
-  if (confirm('确定要退出登录吗？')) {
+  if (confirm(t('header.logoutConfirm'))) {
     authStore.logout()
     router.push('/login')
-    showToast('已安全退出', 'success')
+    showToast(t('header.logoutSuccess'), 'success')
   }
   userMenuOpen.value = false
 }

web/admin-spa/src/i18n/locales/en.js

@@ -23,7 +23,51 @@ export default {
     adminPanel: 'Admin Panel',
     userMenu: 'User Menu',
     logout: 'Logout',
-    settings: 'Settings'
+    settings: 'Settings',
+    
+    // Version related
+    currentVersion: 'Current Version',
+    newVersionAvailable: 'New version available',
+    newVersion: 'New Version',
+    hasUpdate: 'New Version Available',
+    viewUpdate: 'View Update',
+    checkingUpdate: 'Checking for updates...',
+    alreadyLatest: 'Already the latest version',
+    checkUpdate: 'Check Update',
+    
+    // User menu items
+    changeAccountInfo: 'Change Account Info',
+    
+    // Change password modal
+    changePasswordModal: {
+      title: 'Change Account Information',
+      currentUsername: 'Current Username',
+      currentUsernameHint: 'Current username, enter new username to modify',
+      newUsername: 'New Username',
+      newUsernamePlaceholder: 'Enter new username (leave empty to keep unchanged)',
+      newUsernameHint: 'Leave empty to keep username unchanged',
+      currentPassword: 'Current Password',
+      currentPasswordPlaceholder: 'Please enter current password',
+      newPassword: 'New Password',
+      newPasswordPlaceholder: 'Please enter new password',
+      newPasswordHint: 'Password must be at least 8 characters',
+      confirmPassword: 'Confirm New Password',
+      confirmPasswordPlaceholder: 'Please enter new password again',
+      saving: 'Saving...',
+      save: 'Save Changes',
+      
+      // Messages
+      passwordMismatch: 'Passwords do not match',
+      passwordTooShort: 'New password must be at least 8 characters',
+      accountInfoChangeSuccess: 'Account information changed successfully, please log in again',
+      passwordChangeSuccess: 'Password changed successfully, please log in again',
+      changeFailed: 'Change failed',
+      changePasswordFailed: 'Failed to change password'
+    },
+    
+    // Logout
+    logoutConfirm: 'Are you sure you want to logout?',
+    logoutSuccess: 'Logged out safely'
   },
   apiStats: {
     title: 'API Key Usage Statistics',
@@ -160,5 +204,16 @@ export default {
     securityNoticeSingle: 'Your API Key is only used to query your own statistical data and will not be stored or used for other purposes',
     securityNoticeMulti: 'Your API Keys are only used to query statistical data and will not be stored. Some individual information will not be displayed in aggregate mode.',
     multiKeyTip: 'Tip: Supports querying up to 30 API Keys simultaneously. Use Ctrl+Enter for quick query.'
+  },
+  
+  // Login page
+  login: {
+    title: 'Admin Panel',
+    username: 'Username',
+    usernamePlaceholder: 'Please enter username',
+    password: 'Password',
+    passwordPlaceholder: 'Please enter password',
+    loginButton: 'Login',
+    loggingIn: 'Logging in...'
   }
 }

web/admin-spa/src/i18n/locales/zh-cn.js

@@ -23,7 +23,51 @@ export default {
     adminPanel: '管理后台',
     userMenu: '用户菜单',
     logout: '退出登录',
-    settings: '系统设置'
+    settings: '系统设置',
+    
+    // Version related
+    currentVersion: '当前版本',
+    newVersionAvailable: '有新版本可用',
+    newVersion: '新版本',
+    hasUpdate: '有新版本',
+    viewUpdate: '查看更新',
+    checkingUpdate: '检查更新中...',
+    alreadyLatest: '当前已是最新版本',
+    checkUpdate: '检查更新',
+    
+    // User menu items
+    changeAccountInfo: '修改账户信息',
+    
+    // Change password modal
+    changePasswordModal: {
+      title: '修改账户信息',
+      currentUsername: '当前用户名',
+      currentUsernameHint: '当前用户名，输入新用户名以修改',
+      newUsername: '新用户名',
+      newUsernamePlaceholder: '输入新用户名（留空保持不变）',
+      newUsernameHint: '留空表示不修改用户名',
+      currentPassword: '当前密码',
+      currentPasswordPlaceholder: '请输入当前密码',
+      newPassword: '新密码',
+      newPasswordPlaceholder: '请输入新密码',
+      newPasswordHint: '密码长度至少8位',
+      confirmPassword: '确认新密码',
+      confirmPasswordPlaceholder: '请再次输入新密码',
+      saving: '保存中...',
+      save: '保存修改',
+      
+      // Messages
+      passwordMismatch: '两次输入的密码不一致',
+      passwordTooShort: '新密码长度至少8位',
+      accountInfoChangeSuccess: '账户信息修改成功，请重新登录',
+      passwordChangeSuccess: '密码修改成功，请重新登录',
+      changeFailed: '修改失败',
+      changePasswordFailed: '修改密码失败'
+    },
+    
+    // Logout
+    logoutConfirm: '确定要退出登录吗？',
+    logoutSuccess: '已安全退出'
   },
   apiStats: {
     title: 'API Key 使用统计',
@@ -160,5 +204,16 @@ export default {
     securityNoticeSingle: '您的 API Key 仅用于查询自己的统计数据，不会被存储或用于其他用途',
     securityNoticeMulti: '您的 API Keys 仅用于查询统计数据，不会被存储。聚合模式下部分个体化信息将不显示。',
     multiKeyTip: '提示：最多支持同时查询 30 个 API Keys。使用 Ctrl+Enter 快速查询。'
+  },
+  
+  // Login page
+  login: {
+    title: '管理后台',
+    username: '用户名',
+    usernamePlaceholder: '请输入用户名',
+    password: '密码',
+    passwordPlaceholder: '请输入密码',
+    loginButton: '登录',
+    loggingIn: '登录中...'
   }
 }

web/admin-spa/src/i18n/locales/zh-tw.js

@@ -23,7 +23,51 @@ export default {
     adminPanel: '管理後台',
     userMenu: '用戶選單',
     logout: '退出登錄',
-    settings: '系統設置'
+    settings: '系統設置',
+    
+    // Version related
+    currentVersion: '當前版本',
+    newVersionAvailable: '有新版本可用',
+    newVersion: '新版本',
+    hasUpdate: '有新版本',
+    viewUpdate: '查看更新',
+    checkingUpdate: '檢查更新中...',
+    alreadyLatest: '當前已是最新版本',
+    checkUpdate: '檢查更新',
+    
+    // User menu items
+    changeAccountInfo: '修改帳戶資訊',
+    
+    // Change password modal
+    changePasswordModal: {
+      title: '修改帳戶資訊',
+      currentUsername: '當前用戶名',
+      currentUsernameHint: '當前用戶名，輸入新用戶名以修改',
+      newUsername: '新用戶名',
+      newUsernamePlaceholder: '輸入新用戶名（留空保持不變）',
+      newUsernameHint: '留空表示不修改用戶名',
+      currentPassword: '當前密碼',
+      currentPasswordPlaceholder: '請輸入當前密碼',
+      newPassword: '新密碼',
+      newPasswordPlaceholder: '請輸入新密碼',
+      newPasswordHint: '密碼長度至少8位',
+      confirmPassword: '確認新密碼',
+      confirmPasswordPlaceholder: '請再次輸入新密碼',
+      saving: '保存中...',
+      save: '保存修改',
+      
+      // Messages
+      passwordMismatch: '兩次輸入的密碼不一致',
+      passwordTooShort: '新密碼長度至少8位',
+      accountInfoChangeSuccess: '帳戶資訊修改成功，請重新登錄',
+      passwordChangeSuccess: '密碼修改成功，請重新登錄',
+      changeFailed: '修改失敗',
+      changePasswordFailed: '修改密碼失敗'
+    },
+    
+    // Logout
+    logoutConfirm: '確定要退出登錄嗎？',
+    logoutSuccess: '已安全退出'
   },
   apiStats: {
     title: 'API Key 使用統計',
@@ -160,5 +204,16 @@ export default {
     securityNoticeSingle: '您的 API Key 僅用於查詢自己的統計資料，不會被儲存或用於其他用途',
     securityNoticeMulti: '您的 API Keys 僅用於查詢統計資料，不會被儲存。彙整模式下部分個體化資訊將不顯示。',
     multiKeyTip: '提示：最多支援同時查詢 30 個 API Keys。使用 Ctrl+Enter 快速查詢。'
+  },
+  
+  // Login page
+  login: {
+    title: '管理後台',
+    username: '用戶名',
+    usernamePlaceholder: '請輸入用戶名',
+    password: '密碼',
+    passwordPlaceholder: '請輸入密碼',
+    loginButton: '登錄',
+    loggingIn: '登錄中...'
   }
 }

web/admin-spa/src/views/LoginView.vue

@@ -1,7 +1,10 @@
 <template>
   <div class="flex min-h-screen items-center justify-center p-4 sm:p-6">
-    <!-- 主题切换按钮 - 固定在右上角 -->
-    <div class="fixed right-4 top-4 z-50">
+    <!-- 右上角工具栏 -->
+    <div class="fixed right-4 top-4 z-50 flex items-center gap-2 sm:gap-3">
+      <!-- 语言切换按钮 -->
+      <LanguageSwitch mode="dropdown" size="medium" />
+      <!-- 主题切换按钮 -->
       <ThemeToggle mode="dropdown" />
     </div>
 
@@ -34,18 +37,18 @@
           v-else-if="oemLoading"
           class="mx-auto mb-2 h-8 w-48 animate-pulse rounded bg-gray-300/50 sm:h-9 sm:w-64"
         />
-        <p class="text-base text-gray-600 dark:text-gray-400 sm:text-lg">管理后台</p>
+        <p class="text-base text-gray-600 dark:text-gray-400 sm:text-lg">{{ t('login.title') }}</p>
       </div>
 
       <form class="space-y-4 sm:space-y-6" @submit.prevent="handleLogin">
         <div>
           <label class="mb-2 block text-sm font-semibold text-gray-900 dark:text-gray-100 sm:mb-3"
-            >用户名</label
+            >{{ t('login.username') }}</label
           >
           <input
             v-model="loginForm.username"
             class="form-input w-full"
-            placeholder="请输入用户名"
+            :placeholder="t('login.usernamePlaceholder')"
             required
             type="text"
           />
@@ -53,12 +56,12 @@
 
         <div>
           <label class="mb-2 block text-sm font-semibold text-gray-900 dark:text-gray-100 sm:mb-3"
-            >密码</label
+            >{{ t('login.password') }}</label
           >
           <input
             v-model="loginForm.password"
             class="form-input w-full"
-            placeholder="请输入密码"
+            :placeholder="t('login.passwordPlaceholder')"
             required
             type="password"
           />
@@ -71,7 +74,7 @@
         >
           <i v-if="!authStore.loginLoading" class="fas fa-sign-in-alt mr-2" />
           <div v-if="authStore.loginLoading" class="loading-spinner mr-2" />
-          {{ authStore.loginLoading ? '登录中...' : '登录' }}
+          {{ authStore.loginLoading ? t('login.loggingIn') : t('login.loginButton') }}
         </button>
       </form>
 
@@ -87,12 +90,15 @@
 
 <script setup>
 import { ref, onMounted, computed } from 'vue'
+import { useI18n } from 'vue-i18n'
 import { useAuthStore } from '@/stores/auth'
 import { useThemeStore } from '@/stores/theme'
 import ThemeToggle from '@/components/common/ThemeToggle.vue'
+import LanguageSwitch from '@/components/common/LanguageSwitch.vue'
 
 const authStore = useAuthStore()
 const themeStore = useThemeStore()
+const { t } = useI18n()
 const oemLoading = computed(() => authStore.oemLoading)
 
 const loginForm = ref({