fix: language switching now strictly follows URL path

- Remove localStorage dependency for language persistence
- Add route change listener for language updates
- Simplify language switching logic
- Fix language reset issue when refreshing /en pages

lib/lang.js

@@ -70,34 +70,21 @@ export function generateLocaleDict(langString) {
  */
 export function initLocale(lang, locale, changeLang, changeLocale) {
   if (isBrowser) {
-    // 用户请求的语言
-    let queryLang =
-      getQueryVariable('locale') ||
-      getQueryVariable('lang') ||
-      loadLangFromLocalStorage()
+    // 只使用 URL 参数，忽略 localStorage
+    const queryLang = getQueryVariable('locale') || getQueryVariable('lang')
 
     if (queryLang) {
-      // 用正则表达式匹配有效的语言标识符例如zh-CN（可选的 -CN 部分）
-      queryLang = queryLang.match(/[a-zA-Z]{2}(?:-[a-zA-Z]{2})?/)
-      if (queryLang) {
-        queryLang = queryLang[0]
+      const match = queryLang.match(/[a-zA-Z]{2}(?:-[a-zA-Z]{2})?/)
+      if (match) {
+        const targetLang = match[0]
+        changeLang(targetLang)
+        const targetLocale = generateLocaleDict(targetLang)
+        changeLocale(targetLocale)
       }
     }
-
-    let currentLang = lang
-    if (queryLang && queryLang !== lang) {
-      currentLang = queryLang
-    }
-
-    changeLang(currentLang)
-    saveLangToLocalStorage(currentLang)
-
-    const targetLocale = generateLocaleDict(currentLang)
-    if (JSON.stringify(locale) !== JSON.stringify(currentLang)) {
-      changeLocale(targetLocale)
-    }
   }
 }
+
 /**
  * 读取语言
  * @returns {*}