二次开发：补全 PRO 功能 + 优化体验

- 新增站点自定义（标题/Favicon/登录页描述）
- 新增在线自定义 CSS/JS 编辑器
- 扩展备份迁移支持面板配置导出导入
- 默认账号改为 admin/1234
- 设置按钮改为橙色更醒目
- 修复登录页误报"登录过期"弹窗
- 修复 i18n 双重 apps 块导致翻译失效

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/views/login/index.vue

@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import { NButton, NCard, NForm, NFormItem, NGradientText, NInput, NSelect, useMessage } from 'naive-ui'
-import { ref } from 'vue'
+import { onMounted, ref } from 'vue'
 import { login } from '@/api'
 import { useAppStore, useAuthStore } from '@/store'
 import { SvgIcon } from '@/components/common'
@@ -8,14 +8,37 @@ import { router } from '@/router'
 import { t } from '@/locales'
 import { languageOptions } from '@/utils/defaultData'
 import type { Language } from '@/store/modules/app/helper'
+import { getSiteCustomize } from '@/api/system/siteCustomize'
+import type { SiteCustomize } from '@/api/system/siteCustomize'
 
-// const userStore = useUserStore()
 const authStore = useAuthStore()
 const appStore = useAppStore()
 const ms = useMessage()
 const loading = ref(false)
 const languageValue = ref<Language>(appStore.language)
 
+const siteCustomize = ref<SiteCustomize>({
+  siteTitle: '',
+  faviconUrl: '',
+  loginDescription: '',
+})
+
+onMounted(async () => {
+  try {
+    const res = await getSiteCustomize<SiteCustomize>()
+    if (res.code === 0 && res.data) {
+      siteCustomize.value = res.data
+      // 动态设置 favicon
+      if (res.data.faviconUrl) {
+        const link = document.querySelector<HTMLLinkElement>('link[rel~="icon"]')
+        if (link)
+          link.href = res.data.faviconUrl
+      }
+    }
+  }
+  catch {}
+})
+
 // const isShowCaptcha = ref<boolean>(false)
 // const isShowRegister = ref<boolean>(false)
 
@@ -75,9 +98,12 @@ function handleChangeLanuage(value: Language) {
 
       <div class="login-title  ">
         <NGradientText :size="30" type="success" class="!font-bold">
-          {{ $t('common.appName') }}
+          {{ siteCustomize.siteTitle || $t('common.appName') }}
         </NGradientText>
       </div>
+      <div v-if="siteCustomize.loginDescription" class="text-center text-slate-400 text-sm mb-3">
+        {{ siteCustomize.loginDescription }}
+      </div>
       <NForm :model="form" label-width="100px" @keydown.enter="handleSubmit">
         <NFormItem>
           <NInput v-model:value="form.username" :placeholder="$t('login.usernamePlaceholder')">