feat: silent wechat login, marketing tab optimization, admin page foundation

- Add silent WeChat login for MP/browser environments
- Fix Python 3.6 compatibility (remove typing.Annotated usage)
- Marketing page: tab-based content generation with category support
- Translate page: add auto-detect language default
- Homepage: add TTS playback, announcement ticker, remove redundant quick-actions
- Fix FAB button overlap with custom tabbar on customers/quotation pages
- Make openai/anthropic imports lazy for Python 3.6 compat

uni-app/src/pages/login/login.vue

@@ -1,5 +1,9 @@
 <template>
   <view class="login-container">
+    <view class="silent-loading" v-if="silentLoading">
+      <text class="silent-loading-text">正在自动登录...</text>
+    </view>
+
     <view class="welcome-section">
       <text class="logo">TradeMate</text>
       <text class="subtitle">外贸小助手</text>
@@ -110,7 +114,7 @@
 </template>
 
 <script setup>
-import { ref } from 'vue'
+import { ref, onMounted } from 'vue'
 import { authApi } from '@/utils/api.js'
 
 const phone = ref('')
@@ -118,13 +122,73 @@ const password = ref('')
 const username = ref('')
 const isRegister = ref(false)
 const loading = ref(false)
+const silentLoading = ref(true)
 const error = ref('')
 const showForm = ref(false)
 const isWechatAvailable = ref(false)
 
-// #ifdef MP-WEIXIN
-isWechatAvailable.value = true
-// #endif
+const doWechatLogin = async (code) => {
+  const res = await authApi.wechatLogin(code)
+  uni.setStorageSync('token', res.access_token)
+  uni.setStorageSync('userInfo', res.user)
+  uni.setStorageSync('hasLogin', true)
+  uni.setStorageSync('isGuest', false)
+  uni.switchTab({ url: '/pages/index/index' })
+}
+
+onMounted(async () => {
+  // #ifdef MP-WEIXIN
+  // 微信小程序：静默登录
+  isWechatAvailable.value = true
+  try {
+    const loginRes = await new Promise((resolve, reject) => {
+      uni.login({ provider: 'weixin', success: resolve, fail: reject })
+    })
+    await doWechatLogin(loginRes.code)
+  } catch (_) {
+    silentLoading.value = false
+  }
+  // #endif
+
+  // #ifdef H5
+  // H5 微信内置浏览器：OAuth 静默登录
+  const isWechatBrowser = /MicroMessenger/i.test(navigator.userAgent)
+  if (isWechatBrowser) {
+    try {
+      const cfg = await authApi.wechatConfig()
+      if (cfg.available && cfg.app_id) {
+        const params = new URLSearchParams(window.location.search)
+        const code = params.get('code')
+        if (code) {
+          // OAuth 回调，携带 code
+          await doWechatLogin(code)
+          // 清除 URL 中的 code 参数
+          window.history.replaceState({}, '', window.location.pathname)
+          return
+        } else {
+          // 跳转微信 OAuth 授权
+          const redirectUri = encodeURIComponent(window.location.href.split('?')[0])
+          window.location.href =
+            `https://open.weixin.qq.com/connect/oauth2/authorize` +
+            `?appid=${cfg.app_id}` +
+            `&redirect_uri=${redirectUri}` +
+            `&response_type=code` +
+            `&scope=snsapi_base` +
+            `&state=STATE#wechat_redirect`
+          return
+        }
+      }
+    } catch (_) {}
+  }
+  silentLoading.value = false
+  // #endif
+
+  // #ifndef MP-WEIXIN
+  if (!/MicroMessenger/i.test(navigator.userAgent)) {
+    silentLoading.value = false
+  }
+  // #endif
+})
 
 const toggleMode = () => {
   isRegister.value = !isRegister.value
@@ -178,15 +242,7 @@ const handleWechatLogin = () => {
     success: async (loginRes) => {
        try {
          loading.value = true
-         const res = await authApi.wechatLogin(loginRes.code)
-         uni.setStorageSync('token', res.access_token)
-         uni.setStorageSync('userInfo', res.user)
-         uni.setStorageSync('hasLogin', true)
-         uni.setStorageSync('isGuest', false)
-         uni.showToast({ title: '登录成功', icon: 'success' })
-         setTimeout(() => {
-           uni.switchTab({ url: '/pages/index/index' })
-         }, 1000)
+         await doWechatLogin(loginRes.code)
        } catch (err) {
         error.value = err.message || '微信登录失败'
       } finally {
@@ -438,6 +494,24 @@ const goToQuickTry = async () => {
   margin-right: 12rpx;
 }
 
+.silent-loading {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background: #fff;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 999;
+}
+
+.silent-loading-text {
+  font-size: 28rpx;
+  color: #999;
+}
+
 .footer {
   text-align: center;
   margin-top: 40rpx;