feat(i18n): 增强管理端多语言支持，优化语言初始化与恢复逻辑

src/components/providers.tsx

@@ -13,13 +13,29 @@ type ProvidersProps = {
   children: ReactNode;
 };
 
+function applyStoredAdminLanguage() {
+  const locale = hydrateAdminUiLocale();
+  if (!locale) {
+    return;
+  }
+  const current = i18n.resolvedLanguage ?? i18n.language;
+  if (locale !== current) {
+    void i18n.changeLanguage(locale);
+  }
+}
+
 function AdminSessionHydrator() {
   useEffect(() => {
-    const locale = hydrateAdminUiLocale();
-    if (locale && i18n.resolvedLanguage !== locale) {
-      void i18n.changeLanguage(locale);
+    if (i18n.isInitialized) {
+      applyStoredAdminLanguage();
+    } else {
+      i18n.on("initialized", applyStoredAdminLanguage);
     }
     useAdminSessionStore.getState().rehydrate();
+
+    return () => {
+      i18n.off("initialized", applyStoredAdminLanguage);
+    };
   }, []);
 
   return null;