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/translate/translate.vue

@@ -114,13 +114,14 @@ const inputText = ref('')
 const result = ref('')
 const suggestions = ref([])
 const loading = ref(false)
-const targetIndex = ref(1)
+const targetIndex = ref(0)
 const keyboardHeight = ref(0)
 const rating = ref(0)
 const extractedInfo = ref(null)
 const preferences = ref(null)
 
 const targetLangs = ref([
+  { code: 'auto', name: '自动检测' },
   { code: 'en', name: 'English' },
   { code: 'zh', name: '中文' },
   { code: 'es', name: 'Español' },
@@ -143,9 +144,14 @@ const handleTranslate = async () => {
 
   try {
     if (mode.value === 'translate') {
+      let targetLang = targetLangs[targetIndex.value].code
+      if (targetLang === 'auto') {
+        const hasChinese = /[\u4e00-\u9fa5]/.test(inputText.value)
+        targetLang = hasChinese ? 'en' : 'zh'
+      }
       const res = await translateApi.translate(
         inputText.value,
-        targetLangs[targetIndex.value].code
+        targetLang
       )
       result.value = res.translated
       loadPreferences()